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Navigate:  StoreFront / SkyLoc® Structural Fasteners / SkyLoc® External Thread (EXT) Series / SkyLoc® EXT Receptacles

SkyLoc® EXT Receptacles — Beam-Style Locking for Maximum Retention

EXT receptacles feature a beam-style locking element that provides positive retention under extreme vibration and dynamic loading. The receptacle design accommodates radial float and curved panel geometry while maintaining full structural load capacity.

Design Features

  • Beam-style locking prevents fastener loosening
  • Radial float for misalignment tolerance
  • Field-replaceable for extended service life

🔧 Installation Methods

  • Rivet-mounted configurations
  • Bonded installations
  • Tapped receptacles

Receptacle Assembly Components

The EXT receptacle assembly consists of three precision-manufactured components:

QL4-NUT

Thread 1/4-28 UNF-3B, 2-Lead
Material 4140 Steel
Finish Cad Plate, Type II, Class 2
Equivalent CA21021-1

QL4C-CAGE

Material 17-7PH CRES
Heat Treat TH1050
Finish Passivated (AMS2700)
Equivalent CA21021-2

QL4-BASE

Material 4140 Steel
Finish Cad Plate, Type II, Class 2
Equivalent CA21021-3

Components Available Separately: Individual receptacle components (nut, cage, and base) can be purchased separately for replacement or custom configurations. Contact the Skybolt Sales Team for individual component pricing and availability.

Tridair® is a registered trademark of Howmet Aerospace Inc. Skybolt is not affiliated with, endorsed by, or sponsored by Howmet Aerospace Inc. References to these trademarks are made solely to indicate product compatibility and interchangeability with industry-standard fastener systems.

SkyLoc® EXT Receptacles

QL4-21 THUMBNAIL
EXT Nut Assembly
$21.70 - $24.11 Price Details
Alternate Part Number 1: CA21021
Alternate Part Number 2: 5310-01-054-0840
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