Skybolt - SkyLoc® Structural Fasteners / All Products

QL8C10

Wed, 7 Jan 2026 11:18:36 GMT

SkyLoc QL8C10 Caged Floating Receptacle

Eight-Piece Assembly | Radial Float Design | Lightweight Aluminum Construction

Technical Overview

The QL8C10 caged floating receptacle is a precision eight-piece assembly engineered for fastening systems requiring radial float capability with lightweight construction. The assembly features a 7075-T73 aluminum barrel with .1640-32 quad-lead internal cam groove, a 17-7 PH stainless steel cage with cadmium plating for radial float capability, dual spring-loaded cam assemblies, nested 17-7 PH stainless steel compression springs, and a 303 stainless steel flush head stud nut with 5/32" hex recess. This design allows controlled radial movement to accommodate hole misalignment and panel tolerances while maintaining secure quarter-turn fastening. The aluminum construction provides significant weight savings for weight-critical aerospace applications. Available in 19 dash numbers covering grip ranges from .098" to 1.843".

Specifications

Thread Size - Stud Interface:	.1640-32 UNC-3B (4-Lead internal cam groove)
Receptacle Type:	Caged Floating with Radial Float Capability
Assembly Components:	8 pieces (flush stud nut, cage, barrel, upper cam, lower cam, 2 springs, internal stud)
Stud Nut Material:	303 Stainless Steel (ASTM A582), Passivated per AMS 2700
Cage Material:	17-7 PH Stainless Steel (AMS 5528), Heat Treated TH1050, Passivated per AMS 2700, Cadmium Plated per QQ-P-416 Type II, Class 2
Barrel Material:	7075-T73 Aluminum (ASTM B211), Anodized per MIL-A-8625 Type II, Class 2
Upper Cam Material:	Metalic, Black Oxide per MIL-DTL-13924 Class 1
Lower Cam Material:	Passivated per AMS 2700
Spring Materials:	17-7 PH Stainless Steel (ASTM A313), Passivated per AMS 2700
Stud Nut Head Style:	100° Flush Countersunk Head, 5/32" Hex Recess
Overall Dimensions:	.689" width x .574" height (cage), .394" barrel diameter
Grip Range:	.098" – 1.843" (dash number dependent)
Float Capability:	Radial float for hole misalignment accommodation
Mechanical Properties:	Ultimate Tensile Strength 1650 lbs min, Ultimate Single Shear Strength 1800 lbs max
Compatible Systems:	QL8C Series Quarter-Turn Studs
Equivalent Part Number:	CA18157
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Weight-critical structural panels, flush-mounted inspection access doors, aircraft body panels requiring radial float with minimum weight impact
Motorsport: Lightweight body panels, aerodynamic fairings, carbon fiber structures requiring radial float capability
Industrial: Equipment enclosures, lightweight panels requiring hole misalignment tolerance and quarter-turn access
Marine: Lightweight deck panels, hatches requiring corrosion resistance with radial float capability
Defense: Military aircraft lightweight structural panels, ground support equipment requiring weight optimization with radial float

Complete System Components

Component	Part Number	Description
Stud	QL8C21-XPH	Pan head stud, slotted (select dash number for grip)
Receptacle Options	QL8C62	Kee'd threaded insert, self-locking (NSN 5325-00-761-6222)
	QL8C64 Series	Threaded receptacle for tapped installations
	QL8C66 Series	Caged floating receptacle for radial float applications (this product)
Retainer	QL8C61	Spring retainer for loose panel applications
Grommet	QL8C63 Series	Load distribution and panel protection

Key Features

Radial Float Design: Spring cage allows controlled radial movement to accommodate hole misalignment and assembly tolerances
Lightweight Aluminum Construction: 7075-T73 aluminum barrel provides significant weight savings for weight-critical aerospace applications
Flush Mounted Profile: 100° countersunk stud nut sits flush with panel surface for aerodynamic applications
Eight-Piece Assembly: Precision-engineered components work together to provide reliable float capability with quarter-turn operation
Dual Cam System: Upper and lower cam assemblies with nested compression springs ensure consistent engagement and locking force
High-Strength Cage: 17-7 PH stainless steel cage heat treated to TH1050 with cadmium plating for corrosion protection
Quad-Lead Thread: Four-start internal cam groove allows 90-degree rotation for rapid quarter-turn fastening
Extended Grip Range: 19 dash numbers available covering grip ranges from .098" to 1.843"
Industry Standard Interchange: Compatible with CA18157 receptacles

📏 Selection Guide: Use QL8C10 caged floating receptacles in weight-critical applications requiring radial float to accommodate hole misalignment, structural movement, or thermal expansion. Select dash number (-0FH through -18FH) based on calculated grip range (outer panel thickness + inner structure thickness). The lightweight aluminum barrel construction provides significant weight savings over steel alternatives while maintaining structural integrity. Ensure panel counterbore depth accommodates the flush-mounted stud nut for proper aerodynamic installation.

Quality & Compliance

Manufactured by Skybolt Aerospace Fasteners under AS9100D certification at our Leesburg, Florida facility (CAGE Code: 435Z0). All QL8C10 receptacle assemblies are 100% inspected to drawing specifications and include full material traceability. Materials conform to ASTM B211 for 7075-T73 aluminum, AMS 5528 for 17-7 PH stainless steel, ASTM A582 for 303 stainless steel, ASTM B853 for 304 stainless steel, and ASTM A313 for 17-7 PH spring steel. Anodizing meets MIL-A-8625 Type II, Class 2 requirements. Cadmium plating on cage meets QQ-P-416 Type II, Class 2 specifications. Black oxide finish on upper cam meets MIL-DTL-13924 Class 1 requirements. Assembly meets minimum ultimate tensile strength of 1650 lbs and maximum ultimate single shear strength of 1800 lbs.

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.

QL8C78

Wed, 7 Jan 2026 11:08:18 GMT

QL8C78
Buy Now: $32.50

SkyLoc QL8C78 Threaded Receptacle

Quad-Lead Thread | 7/16-20 UNF Mounting | Six-Piece Assembly | 303 Stainless Steel

Technical Overview

The QL8C78 threaded receptacle is a precision six-piece assembly engineered for fastening systems requiring threaded installation. The assembly features a 303 stainless steel threaded barrel with 7/16-20 UNF-2A external mounting threads and .1640-32 UNC-3A quad-lead internal cam groove for stud engagement. Internal components include dual spring-loaded cam assemblies, nested 17-7 PH stainless steel compression springs, and an A286 stainless steel internal stud with dry film lubricant per MIL-PRF-46010. This design provides reliable quarter-turn operation with 7/16-20 UNF mounting threads for installation into tapped holes or threaded mounting plates. Manufactured to AS9100D quality standards and interchangeable with CA18178 receptacles.

Specifications

Thread Size - Stud Interface:	.1640-32 UNC-3A (4-Lead internal cam groove)
Thread Size - Mounting:	7/16-20 UNF-2A (modified major diameter .430" max)
Receptacle Type:	Threaded Receptacle for Tapped Installations
Assembly Components:	6 pieces (barrel, upper cam, lower cam, 2 springs, internal stud)
Barrel Material:	303 Stainless Steel (ASTM A582), Passivated per AMS 2700
Upper Cam Material:	Metalic, Black Oxide per MIL-DTL-13924 Class 1
Lower Cam Material:	304 Stainless Steel (ASTM B853), Passivated per AMS 2700
Spring Materials:	17-7 PH Stainless Steel (ASTM A313), Passivated per AMS 2700
Internal Stud Material:	A286 Stainless Steel, Heat Treated to 140 KSI, Passivated per AMS 2700, Dry Film Lube per MIL-PRF-46010
Overall Diameter:	.382" (body) / .453" (mounting flange)
Overall Height:	.590" / .530"
Compatible Systems:	QL8C Series Quarter-Turn Studs
Equivalent Part Number:	CA18178
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Structural panels, inspection access doors, engine cowlings requiring threaded receptacle installation in tapped holes
Motorsport: Body panels, chassis components, quick-access covers in applications with pre-tapped mounting locations
Industrial: Equipment enclosures, machinery panels, control cabinets with threaded mounting provisions
Marine: Deck hatches, structural assemblies in corrosive environments requiring threaded quarter-turn receptacles
Defense: Military aircraft structural panels, ground support equipment requiring threaded receptacle mounting

Complete System Components

Component	Part Number	Description
Stud	QL8C21-XPH	Pan head stud, slotted (select dash number for grip)
Receptacle Options	QL8C62	Kee'd threaded insert, self-locking (NSN 5325-00-761-6222)
	QL8C64 Series	Threaded receptacle for tapped installations (this product)
	QL8C66 Series	Caged floating receptacle for radial float applications
Retainer	QL8C61	Spring retainer for loose panel applications
Grommet	QL8C63 Series	Load distribution and panel protection

Key Features

7/16-20 UNF Threading: Fine thread design provides secure mounting in tapped holes with excellent thread engagement
Six-Piece Assembly: Precision-engineered components work together to provide reliable quarter-turn operation
Dual Cam System: Upper and lower cam assemblies with nested compression springs ensure consistent stud engagement
Quad-Lead Thread: Four-start internal cam groove allows 90-degree rotation for rapid quarter-turn fastening
High-Strength Internal Stud: A286 stainless steel heat treated to 140 KSI with dry film lubricant for smooth operation
Corrosion-Resistant Materials: 303 and 304 stainless steel construction with passivation for long-term durability
Compact Design: .382" body diameter allows installation in space-constrained applications
Industry Standard Interchange: Compatible with CA18178 receptacles

📏 Installation Guide: The QL8C78 threaded receptacle requires a tapped 7/16-20 UNF hole for installation. The fine thread design provides excellent thread engagement and secure mounting. Ensure proper thread depth and installation torque for optimal performance. This receptacle is ideal for applications with pre-tapped mounting locations requiring reliable quarter-turn fastening without the need for bonded or riveted installation methods.

Quality & Compliance

Manufactured by Skybolt Aerospace Fasteners under AS9100D certification at our Leesburg, Florida facility (CAGE Code: 435Z0). All QL8C78 receptacle assemblies are 100% inspected to drawing specifications and include full material traceability. Materials conform to ASTM A582 for 303 stainless steel, ASTM B853 for 304 stainless steel, ASTM A313 for 17-7 PH spring steel, and AMS 5731/5737 for A286 stainless steel. Black oxide finish on upper cam meets MIL-DTL-13924 Class 1 requirements. Dry film lubricant meets MIL-PRF-46010 specifications for enhanced performance.

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.

QL8C62

Wed, 7 Jan 2026 11:05:55 GMT

QL8C62
Buy Now: $42.09

SkyLoc QL8C62 Kee'd Threaded Receptacle

Self-Locking Insert | Quad-Lead Thread | Seven-Piece Assembly | NSN 5325-00-761-6222

Technical Overview

The QL8C62 Kee'd threaded receptacle is a precision seven-piece self-locking insert assembly engineered for fastening systems requiring positive locking capability. The assembly features a 303 stainless steel threaded barrel with 1/2-13 UNC internal mounting threads and .1640-32 quad-lead cam groove for stud engagement. Internal components include dual spring-loaded cam assemblies, nested 17-7 PH stainless steel compression springs, and four 304 stainless steel Kee retention tabs. This design provides self-locking capability through the Kee tab mechanism while maintaining rapid quarter-turn installation and removal. The receptacle is secured with 1/2-13 UNC threads for installation into tapped holes or mounting plates.

Specifications

Thread Size - Stud Interface:	.1640-32 Quad-Lead (internal cam groove)
Thread Size - Mounting:	1/2-13 UNC-2A (modified minor diameter .438")
Receptacle Type:	Kee'd Threaded Insert (Self-Locking)
Assembly Components:	7 pieces (barrel, upper cam, lower cam, 2 springs, stud, 4 Kee tabs)
Barrel Material:	303 Stainless Steel (ASTM A582), Passivated per AMS 2700
Upper Cam Material:	Metalic, Black Oxide per MIL-DTL-13924 Class 1
Lower Cam Material:	304 Stainless Steel (ASTM B853), Passivated per AMS 2700
Spring Materials:	17-7 PH Stainless Steel (ASTM A313), Passivated per AMS 2700
Kee Tab Material:	304 Stainless Steel (ASTM A276), Passivated per AMS 2700
Overall Diameter:	.382"
Overall Height:	.550"
NSN Number:	5325-00-761-6222
Compatible Systems:	QL8C Series Studs
Equivalent Part Number:	CA18062
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Flight-critical panels, engine cowlings, inspection access doors requiring positive locking to prevent inadvertent opening
Motorsport: High-vibration applications, safety-critical bodywork, underbody panels requiring self-locking capability
Industrial: Equipment access panels, control enclosures in high-vibration environments requiring positive locking
Marine: Deck hatches, structural panels in corrosive environments requiring self-locking quarter-turn fastening
Defense: Military aircraft structural panels (NSN 5325-00-761-6222), ground support equipment requiring MIL-SPEC self-locking receptacles

Complete System Components

Component	Part Number	Description
Stud	QL8C21-XPH	Pan head stud, slotted (select dash number for grip)
Receptacle Options	QL8C62	Kee'd threaded insert, self-locking (NSN 5325-00-761-6222) (this product)
	QL8C64 Series	Threaded receptacle for tapped installations
	QL8C66 Series	Caged floating receptacle for radial float applications
Retainer	QL8C61	Spring retainer for loose panel applications
Grommet	QL8C63 Series	Load distribution and panel protection

Key Features

Self-Locking Design: Four 304 stainless steel Kee tabs provide positive locking to prevent inadvertent opening from vibration or shock loads
Seven-Piece Assembly: Precision-engineered components work together to provide reliable quarter-turn operation with self-locking capability
Dual Cam System: Upper and lower cam assemblies with nested compression springs ensure consistent engagement and locking force
Quad-Lead Thread: Four-start internal cam groove allows 90-degree rotation for rapid quarter-turn fastening
Corrosion-Resistant Materials: 303 and 304 stainless steel construction with passivation provides long-term durability in harsh environments
1/2-13 UNC Mounting: Standard coarse thread for secure installation into tapped holes or mounting plates
Military NSN: NSN 5325-00-761-6222 for defense procurement and logistics
Industry Standard Interchange: Compatible with CA18062 receptacles

📏 Installation Guide: The QL8C62 Kee'd receptacle requires a tapped 1/2-13 UNC hole for installation. The self-locking Kee tabs engage automatically during stud rotation, providing positive locking without additional hardware. Ensure proper thread engagement depth and torque specification for secure mounting. This receptacle is ideal for applications requiring positive locking to prevent inadvertent opening in high-vibration or safety-critical installations.

Quality & Compliance

Manufactured by Skybolt Aerospace Fasteners under AS9100D certification at our Leesburg, Florida facility (CAGE Code: 435Z0). All QL8C62 receptacle assemblies are 100% inspected to drawing specifications and include full material traceability. Materials conform to ASTM A582 for 303 stainless steel, ASTM B853 for 304 stainless steel, and ASTM A313 for 17-7 PH spring steel. Black oxide finish on upper cam meets MIL-DTL-13924 Class 1 requirements. Assembly is qualified to NSN 5325-00-761-6222 for military and defense applications.

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.

QL4C-3G-CAD

Tue, 6 Jan 2026 10:50:13 GMT

QL4C-3G-CAD
Buy Now: $17.09

SkyLoc QL4C Grommet Series

Load Distribution | Panel Protection | 304 Stainless Steel | Multiple Grip Ranges

Technical Overview

The QL4C grommet series provides essential load distribution and panel protection for quarter-turn fastening systems. Manufactured from 304 stainless steel and heat treated to Condition A, these grommets distribute fastener loads across a wider panel area, reducing stress concentration and preventing panel damage. Available in three grip ranges (-1G, -2G, -3G) to accommodate various panel thicknesses from .075" to .155", the grommet series features a precision-formed cup design that interfaces between the stud head and panel surface. Two finish options are available: passivated for general aerospace applications (QL4C-XG) and cadmium plated Type II, Class 2 for enhanced corrosion protection (QL4C-XG-CAD).

Specifications

Nominal Size:	1/4"
Material:	304 Stainless Steel
Heat Treatment:	Condition A
Grip Range Coverage:	.075" – .155" (dash number dependent)
Diameter (A):	.505" max
Center Hole (C):	.255" / .250"
Reference Dimension (E):	.310"
Compatible Systems:	QL4S Series Quarter-Turn Studs
Equivalent Part Numbers:	CA21038-4 Series, CA21038C-4 Series
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Composite panels, thin-gauge sheet metal, applications requiring load distribution to prevent panel dimpling or stress cracking
Motorsport: Carbon fiber bodywork, lightweight panels, high-vibration applications requiring load spreading
Industrial: Thin panel installations, equipment enclosures, applications requiring surface protection from fastener bearing loads
Marine: Deck panels, thin-wall structures in corrosive environments requiring load distribution and panel protection
Defense: Military aircraft composite structures, lightweight panels requiring optimized load distribution

Grommet Variants

Part Number	Grip Range	Finish	Equivalent Part
QL4C-1G	.075" – .095"	Passivated	CA21038-4-1
QL4C-2G	.096" – .115"	Passivated	CA21038-4-2
QL4C-3G	.116" – .135"	Passivated	CA21038-4-3
QL4C-1G-CAD	.075" – .095"	Cadmium Plated, Type II, Class 2	CA21038C-4-1
QL4C-2G-CAD	.096" – .115"	Cadmium Plated, Type II, Class 2	CA21038C-4-2
QL4C-3G-CAD	.116" – .135"	Cadmium Plated, Type II, Class 2	CA21038C-4-3

Complete System Components

Component	Part Number	Description
Stud	QL4S-EXT Series	Studs compatible with 1/4-28 two-lead thread receptacles
Receptacle	QL4-21	Caged receptacle assembly
Retainer	QL4S-RET Series	Spring retainers for loose panel applications
Grommet	QL4C-XG / QL4C-XG-CAD	Load distribution and panel protection (this product)

Key Features

Load Distribution: Precision-formed cup design distributes fastener loads across a wider panel area, preventing stress concentration and panel damage
Panel Protection: Creates protective interface between stud head and panel surface, preventing wear and surface damage
304 Stainless Steel: Corrosion-resistant material provides long service life in demanding environments
Multiple Grip Ranges: Three grip ranges (-1G, -2G, -3G) accommodate panel thicknesses from .075" to .135"
Two Finish Options: Passivated (QL4C-XG) for general use, cadmium plated (QL4C-XG-CAD) for enhanced corrosion protection
Industry Standard Interchange: Compatible with CA21038-4 and CA21038C-4 series grommets

📏 Selection Guide: Select grommet dash number (-1G, -2G, or -3G) based on panel thickness to ensure proper fit and load distribution. Choose passivated finish (QL4C-XG) for general aerospace applications or cadmium plated finish (QL4C-XG-CAD) for enhanced corrosion protection in marine, military, and harsh environment installations. Grommets are essential for thin panels, composite materials, and applications requiring optimized load distribution.

Quality & Compliance

Manufactured by Skybolt Aerospace Fasteners under AS9100D certification at our Leesburg, Florida facility (CAGE Code: 435Z0). All QL4C grommets are 100% inspected to drawing specifications and include full material traceability. Material conforms to 304 stainless steel specifications with heat treatment to Condition A. Cadmium plating on QL4C-XG-CAD variants meets AMS QQ-P-416 Type II, Class 2 requirements for aerospace and military applications.

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.

QL4C-2G-CAD

Tue, 6 Jan 2026 10:48:51 GMT

QL4C-2G-CAD
Buy Now: $15.99

SkyLoc QL4C Grommet Series

Load Distribution | Panel Protection | 304 Stainless Steel | Multiple Grip Ranges

Technical Overview

Specifications

Nominal Size:	1/4"
Material:	304 Stainless Steel
Heat Treatment:	Condition A
Grip Range Coverage:	.075" – .155" (dash number dependent)
Diameter (A):	.505" max
Center Hole (C):	.255" / .250"
Reference Dimension (E):	.310"
Compatible Systems:	QL4S Series Quarter-Turn Studs
Equivalent Part Numbers:	CA21038-4 Series, CA21038C-4 Series
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Composite panels, thin-gauge sheet metal, applications requiring load distribution to prevent panel dimpling or stress cracking
Motorsport: Carbon fiber bodywork, lightweight panels, high-vibration applications requiring load spreading
Industrial: Thin panel installations, equipment enclosures, applications requiring surface protection from fastener bearing loads
Marine: Deck panels, thin-wall structures in corrosive environments requiring load distribution and panel protection
Defense: Military aircraft composite structures, lightweight panels requiring optimized load distribution

Grommet Variants

Part Number	Grip Range	Finish	Equivalent Part
QL4C-1G	.075" – .095"	Passivated	CA21038-4-1
QL4C-2G	.096" – .115"	Passivated	CA21038-4-2
QL4C-3G	.116" – .135"	Passivated	CA21038-4-3
QL4C-1G-CAD	.075" – .095"	Cadmium Plated, Type II, Class 2	CA21038C-4-1
QL4C-2G-CAD	.096" – .115"	Cadmium Plated, Type II, Class 2	CA21038C-4-2
QL4C-3G-CAD	.116" – .135"	Cadmium Plated, Type II, Class 2	CA21038C-4-3

Complete System Components

Component	Part Number	Description
Stud	QL4S-EXT Series	Studs compatible with 1/4-28 two-lead thread receptacles
Receptacle	QL4-21	Caged receptacle assembly
Retainer	QL4S-RET Series	Spring retainers for loose panel applications
Grommet	QL4C-XG / QL4C-XG-CAD	Load distribution and panel protection (this product)

Key Features

Load Distribution: Precision-formed cup design distributes fastener loads across a wider panel area, preventing stress concentration and panel damage
Panel Protection: Creates protective interface between stud head and panel surface, preventing wear and surface damage
304 Stainless Steel: Corrosion-resistant material provides long service life in demanding environments
Multiple Grip Ranges: Three grip ranges (-1G, -2G, -3G) accommodate panel thicknesses from .075" to .135"
Two Finish Options: Passivated (QL4C-XG) for general use, cadmium plated (QL4C-XG-CAD) for enhanced corrosion protection
Industry Standard Interchange: Compatible with CA21038-4 and CA21038C-4 series grommets

Quality & Compliance

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.

QL4C-1G-CAD

Tue, 6 Jan 2026 10:46:51 GMT

QL4C-1G-CAD
Buy Now: $15.00

SkyLoc QL4C Grommet Series

Load Distribution | Panel Protection | 304 Stainless Steel | Multiple Grip Ranges

Technical Overview

Specifications

Nominal Size:	1/4"
Material:	304 Stainless Steel
Heat Treatment:	Condition A
Grip Range Coverage:	.075" – .155" (dash number dependent)
Diameter (A):	.505" max
Center Hole (C):	.255" / .250"
Reference Dimension (E):	.310"
Compatible Systems:	QL4S Series Quarter-Turn Studs
Equivalent Part Numbers:	CA21038-4 Series, CA21038C-4 Series
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Composite panels, thin-gauge sheet metal, applications requiring load distribution to prevent panel dimpling or stress cracking
Motorsport: Carbon fiber bodywork, lightweight panels, high-vibration applications requiring load spreading
Industrial: Thin panel installations, equipment enclosures, applications requiring surface protection from fastener bearing loads
Marine: Deck panels, thin-wall structures in corrosive environments requiring load distribution and panel protection
Defense: Military aircraft composite structures, lightweight panels requiring optimized load distribution

Grommet Variants

Part Number	Grip Range	Finish	Equivalent Part
QL4C-1G	.075" – .095"	Passivated	CA21038-4-1
QL4C-2G	.096" – .115"	Passivated	CA21038-4-2
QL4C-3G	.116" – .135"	Passivated	CA21038-4-3
QL4C-1G-CAD	.075" – .095"	Cadmium Plated, Type II, Class 2	CA21038C-4-1
QL4C-2G-CAD	.096" – .115"	Cadmium Plated, Type II, Class 2	CA21038C-4-2
QL4C-3G-CAD	.116" – .135"	Cadmium Plated, Type II, Class 2	CA21038C-4-3

Complete System Components

Component	Part Number	Description
Stud	QL4S-EXT Series	Studs compatible with 1/4-28 two-lead thread receptacles
Receptacle	QL4-21	Caged receptacle assembly
Retainer	QL4S-RET Series	Spring retainers for loose panel applications
Grommet	QL4C-XG / QL4C-XG-CAD	Load distribution and panel protection (this product)

Key Features

Load Distribution: Precision-formed cup design distributes fastener loads across a wider panel area, preventing stress concentration and panel damage
Panel Protection: Creates protective interface between stud head and panel surface, preventing wear and surface damage
304 Stainless Steel: Corrosion-resistant material provides long service life in demanding environments
Multiple Grip Ranges: Three grip ranges (-1G, -2G, -3G) accommodate panel thicknesses from .075" to .135"
Two Finish Options: Passivated (QL4C-XG) for general use, cadmium plated (QL4C-XG-CAD) for enhanced corrosion protection
Industry Standard Interchange: Compatible with CA21038-4 and CA21038C-4 series grommets

Quality & Compliance

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.

QL4C-3G

Tue, 6 Jan 2026 10:41:35 GMT

QL4C-3G
Buy Now: $15.73

SkyLoc QL4C Grommet Series

Load Distribution | Panel Protection | 304 Stainless Steel | Multiple Grip Ranges

Technical Overview

Specifications

Nominal Size:	1/4"
Material:	304 Stainless Steel
Heat Treatment:	Condition A
Grip Range Coverage:	.075" – .155" (dash number dependent)
Diameter (A):	.505" max
Center Hole (C):	.255" / .250"
Reference Dimension (E):	.310"
Compatible Systems:	QL4S Series Quarter-Turn Studs
Equivalent Part Numbers:	CA21038-4 Series, CA21038C-4 Series
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Composite panels, thin-gauge sheet metal, applications requiring load distribution to prevent panel dimpling or stress cracking
Motorsport: Carbon fiber bodywork, lightweight panels, high-vibration applications requiring load spreading
Industrial: Thin panel installations, equipment enclosures, applications requiring surface protection from fastener bearing loads
Marine: Deck panels, thin-wall structures in corrosive environments requiring load distribution and panel protection
Defense: Military aircraft composite structures, lightweight panels requiring optimized load distribution

Grommet Variants

Part Number	Grip Range	Finish	Equivalent Part
QL4C-1G	.075" – .095"	Passivated	CA21038-4-1
QL4C-2G	.096" – .115"	Passivated	CA21038-4-2
QL4C-3G	.116" – .135"	Passivated	CA21038-4-3
QL4C-1G-CAD	.075" – .095"	Cadmium Plated, Type II, Class 2	CA21038C-4-1
QL4C-2G-CAD	.096" – .115"	Cadmium Plated, Type II, Class 2	CA21038C-4-2
QL4C-3G-CAD	.116" – .135"	Cadmium Plated, Type II, Class 2	CA21038C-4-3

Complete System Components

Component	Part Number	Description
Stud	QL4S-EXT Series	Studs compatible with 1/4-28 two-lead thread receptacles
Receptacle	QL4-21	Caged receptacle assembly
Retainer	QL4S-RET Series	Spring retainers for loose panel applications
Grommet	QL4C-XG / QL4C-XG-CAD	Load distribution and panel protection (this product)

Key Features

Load Distribution: Precision-formed cup design distributes fastener loads across a wider panel area, preventing stress concentration and panel damage
Panel Protection: Creates protective interface between stud head and panel surface, preventing wear and surface damage
304 Stainless Steel: Corrosion-resistant material provides long service life in demanding environments
Multiple Grip Ranges: Three grip ranges (-1G, -2G, -3G) accommodate panel thicknesses from .075" to .135"
Two Finish Options: Passivated (QL4C-XG) for general use, cadmium plated (QL4C-XG-CAD) for enhanced corrosion protection
Industry Standard Interchange: Compatible with CA21038-4 and CA21038C-4 series grommets

Quality & Compliance

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.

QL4C-2G

Tue, 6 Jan 2026 10:41:35 GMT

QL4C-2G
Buy Now: $14.96

SkyLoc QL4C Grommet Series

Load Distribution | Panel Protection | 304 Stainless Steel | Multiple Grip Ranges

Technical Overview

Specifications

Nominal Size:	1/4"
Material:	304 Stainless Steel
Heat Treatment:	Condition A
Grip Range Coverage:	.075" – .155" (dash number dependent)
Diameter (A):	.505" max
Center Hole (C):	.255" / .250"
Reference Dimension (E):	.310"
Compatible Systems:	QL4S Series Quarter-Turn Studs
Equivalent Part Numbers:	CA21038-4 Series, CA21038C-4 Series
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Composite panels, thin-gauge sheet metal, applications requiring load distribution to prevent panel dimpling or stress cracking
Motorsport: Carbon fiber bodywork, lightweight panels, high-vibration applications requiring load spreading
Industrial: Thin panel installations, equipment enclosures, applications requiring surface protection from fastener bearing loads
Marine: Deck panels, thin-wall structures in corrosive environments requiring load distribution and panel protection
Defense: Military aircraft composite structures, lightweight panels requiring optimized load distribution

Grommet Variants

Part Number	Grip Range	Finish	Equivalent Part
QL4C-1G	.075" – .095"	Passivated	CA21038-4-1
QL4C-2G	.096" – .115"	Passivated	CA21038-4-2
QL4C-3G	.116" – .135"	Passivated	CA21038-4-3
QL4C-1G-CAD	.075" – .095"	Cadmium Plated, Type II, Class 2	CA21038C-4-1
QL4C-2G-CAD	.096" – .115"	Cadmium Plated, Type II, Class 2	CA21038C-4-2
QL4C-3G-CAD	.116" – .135"	Cadmium Plated, Type II, Class 2	CA21038C-4-3

Complete System Components

Component	Part Number	Description
Stud	QL4S-EXT Series	Studs compatible with 1/4-28 two-lead thread receptacles
Receptacle	QL4-21	Caged receptacle assembly
Retainer	QL4S-RET Series	Spring retainers for loose panel applications
Grommet	QL4C-XG / QL4C-XG-CAD	Load distribution and panel protection (this product)

Key Features

Load Distribution: Precision-formed cup design distributes fastener loads across a wider panel area, preventing stress concentration and panel damage
Panel Protection: Creates protective interface between stud head and panel surface, preventing wear and surface damage
304 Stainless Steel: Corrosion-resistant material provides long service life in demanding environments
Multiple Grip Ranges: Three grip ranges (-1G, -2G, -3G) accommodate panel thicknesses from .075" to .135"
Two Finish Options: Passivated (QL4C-XG) for general use, cadmium plated (QL4C-XG-CAD) for enhanced corrosion protection
Industry Standard Interchange: Compatible with CA21038-4 and CA21038C-4 series grommets

Quality & Compliance

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.

QL4C-1G

Tue, 6 Jan 2026 08:14:45 GMT

QL4C-1G
Buy Now: $14.45

SkyLoc QL4C Grommet Series

Load Distribution | Panel Protection | 304 Stainless Steel | Multiple Grip Ranges

Technical Overview

Specifications

Nominal Size:	1/4"
Material:	304 Stainless Steel
Heat Treatment:	Condition A
Grip Range Coverage:	.075" – .155" (dash number dependent)
Diameter (A):	.505" max
Center Hole (C):	.255" / .250"
Reference Dimension (E):	.310"
Compatible Systems:	QL4S Series Quarter-Turn Studs
Equivalent Part Numbers:	CA21038-4 Series, CA21038C-4 Series
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Composite panels, thin-gauge sheet metal, applications requiring load distribution to prevent panel dimpling or stress cracking
Motorsport: Carbon fiber bodywork, lightweight panels, high-vibration applications requiring load spreading
Industrial: Thin panel installations, equipment enclosures, applications requiring surface protection from fastener bearing loads
Marine: Deck panels, thin-wall structures in corrosive environments requiring load distribution and panel protection
Defense: Military aircraft composite structures, lightweight panels requiring optimized load distribution

Grommet Variants

Part Number	Grip Range	Finish	Equivalent Part
QL4C-1G	.075" – .095"	Passivated	CA21038-4-1
QL4C-2G	.096" – .115"	Passivated	CA21038-4-2
QL4C-3G	.116" – .135"	Passivated	CA21038-4-3
QL4C-1G-CAD	.075" – .095"	Cadmium Plated, Type II, Class 2	CA21038C-4-1
QL4C-2G-CAD	.096" – .115"	Cadmium Plated, Type II, Class 2	CA21038C-4-2
QL4C-3G-CAD	.116" – .135"	Cadmium Plated, Type II, Class 2	CA21038C-4-3

Complete System Components

Component	Part Number	Description
Stud	QL4S-EXT Series	Studs compatible with 1/4-28 two-lead thread receptacles
Receptacle	QL4-21	Caged receptacle assembly
Retainer	QL4S-RET Series	Spring retainers for loose panel applications
Grommet	QL4C-XG / QL4C-XG-CAD	Load distribution and panel protection (this product)

Key Features

Load Distribution: Precision-formed cup design distributes fastener loads across a wider panel area, preventing stress concentration and panel damage
Panel Protection: Creates protective interface between stud head and panel surface, preventing wear and surface damage
304 Stainless Steel: Corrosion-resistant material provides long service life in demanding environments
Multiple Grip Ranges: Three grip ranges (-1G, -2G, -3G) accommodate panel thicknesses from .075" to .135"
Two Finish Options: Passivated (QL4C-XG) for general use, cadmium plated (QL4C-XG-CAD) for enhanced corrosion protection
Industry Standard Interchange: Compatible with CA21038-4 and CA21038C-4 series grommets

Quality & Compliance

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.

QL4-21

Tue, 6 Jan 2026 07:00:07 GMT

QL4-21
Buy Now: $24.11

SkyLoc QL4-21 Caged Floating Receptacle

Three-Piece Assembly | Radial Float Design | 4140 High-Strength Steel

Technical Overview

The QL4-21 caged floating receptacle is a precision three-piece assembly engineered for structural applications requiring radial float capability. The assembly consists of the QL4-NUT (threaded insert with 1/4-28 UNF-3B two-lead thread), QL4C-CAGE (17-7 PH stainless steel spring cage), and QL4-BASE (mounting base). This design allows controlled radial movement to accommodate hole misalignment and panel tolerances while maintaining secure fastening capability. Manufactured from 4140 steel heat treated to 180-200 KSI with cadmium plating per AMS QQ-P-416 Type II, Class 2 and dry film lubricant, this receptacle provides exceptional strength and corrosion resistance for demanding aerospace and industrial installations.

Specifications

Assembly Components:	QL4-NUT, QL4C-CAGE, QL4-BASE
Thread Size:	1/4-28 UNF-3B (2-Lead Thread)
Receptacle Type:	Caged Floating with Radial Float Capability
Nut & Base Material:	4140 Steel (ASTM A29)
Cage Material:	17-7 PH Stainless Steel (ASTM A564)
Heat Treatment:	180-200 KSI per AMS 2759 (nut & base), TH1050 (cage)
Finish:	Cadmium Plate per AMS QQ-P-416 Type II, Class 2 with Dry Film Lubricant (nut & base), Passivated per AMS 2700 (cage)
Float Capability:	Radial float for hole misalignment accommodation
Compatible Systems:	QL4S Series Quarter-Turn Studs
Equivalent Part Number:	CA21021 Series
Compliance:	AS9100D Certified, CAGE Code 435Z0

Applications

Aerospace: Structural panels requiring hole misalignment tolerance, engine cowlings, access doors where radial float compensates for assembly tolerances
Motorsport: Body panels, chassis components, applications requiring quick-release capability with tolerance accommodation
Industrial: Equipment enclosures, machinery panels, installations requiring radial movement to accommodate thermal expansion or structural flexing
Marine: Deck hardware, structural assemblies in corrosive environments requiring float capability
Defense: Military aircraft structural panels, ground support equipment requiring MIL-SPEC corrosion protection with radial float

QL4-21 Assembly Components

Component	Part Number	Description
Nut	QL4-NUT	Threaded insert with 1/4-28 UNF-3B two-lead thread, 4140 steel, cadmium plated with dry film lube
Cage	QL4C-CAGE	Spring cage for radial float, 17-7 PH stainless steel, passivated
Base	QL4-BASE	Mounting base, 4140 steel, cadmium plated with dry film lube

Complete System Components

Component	Part Number	Description
Stud	QL4S Series	Quarter-turn studs compatible with 1/4-28 two-lead thread receptacles
Receptacle	QL4-21	Caged floating receptacle assembly (this product)
Retainer	QL4S-RET Series	Spring retainers for loose panel applications
Grommet	QL4G Series	Load distribution and panel protection

Key Features

Radial Float Design: Spring cage allows controlled radial movement to accommodate hole misalignment and assembly tolerances
Three-Piece Construction: Modular design with nut, cage, and base components for reliable performance and serviceability
High-Strength Materials: 4140 steel heat treated to 180-200 KSI provides superior load capacity for structural applications
Corrosion Protection: Cadmium plating per AMS QQ-P-416 Type II, Class 2 with dry film lubricant for harsh environment durability
Two-Lead Thread: 1/4-28 UNF-3B dual-start thread enables 180-degree rotation for rapid quarter-turn fastening
Industry Standard Interchange: Compatible with CA21021 series receptacles

📏 Selection Guide: Use QL4-21 caged floating receptacles in applications requiring radial float to accommodate hole misalignment, structural movement, or thermal expansion. The three-piece assembly provides reliable quarter-turn fastening while allowing controlled radial movement. Individual components (QL4-NUT, QL4C-CAGE, QL4-BASE) are available separately for service and replacement - contact sales for component ordering information.

Quality & Compliance

Manufactured by Skybolt Aerospace Fasteners under AS9100D certification at our Leesburg, Florida facility (CAGE Code: 435Z0). All QL4-21 receptacle assemblies are 100% inspected to drawing specifications and include full material traceability. Materials conform to ASTM A29 for 4140 alloy steel and ASTM A564 for 17-7 PH stainless steel. Heat treatment meets AMS 2759 requirements for 180-200 KSI ultimate tensile strength. Cadmium plating on nut and base components meets AMS QQ-P-416 Type II, Class 2 requirements with dry film lubricant for enhanced performance in aerospace and military applications.

Tridair® is a registered trademark of Howmet Aerospace, Inc. or its subsidiaries. Skybolt products are compatible alternatives and are not manufactured by or affiliated with Howmet Aerospace.

Visit SkyLoc® Structural Fasteners to see additional products in this category.