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.

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

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

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.