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

SkyLoc® EXT Grommets — Structural Load Distribution

EXT grommets provide reinforcement and load distribution for 1/4-28 structural installations. Designed to withstand the higher loads associated with TSO-C148 structural applications.

⚡ Function

  • Distributes 2,600+ lbs tensile loads across panel
  • Prevents panel bearing failure in thin-gauge materials
  • Provides wear resistance for high-cycle operations
  • Essential for composite and honeycomb panel installations

📋 Available Configurations — 1/4" Nominal Size

Part No.EquivalentLGrip RangeMaterialFinish
QL4C-1G CA21038-4-1 .115 .075 – .095 304 CRES Passivated
QL4C-2G CA21038-4-2 .135 .096 – .115
QL4C-3G CA21038-4-3 .155 .116 – .135
QL4C-1G-CAD CA21038C-4-1 .115 .075 – .095 304 CRES Cadmium Plated,
Type II, Class 2
QL4C-2G-CAD CA21038C-4-2 .135 .096 – .115
QL4C-3G-CAD CA21038C-4-3 .155 .116 – .135

Tridair® is a registered trademark of Howmet Aerospace Inc. Skybolt is not affiliated with, endorsed by, or sponsored by Howmet Aerospace Inc. References to this trademark are made solely to indicate product compatibility.

SkyLoc® EXT Grommets
EXT Grommet - Passivated - L 0.115 Grip 0.075-0.095
$13.13 - $16.62 Price Details
Alternate Part Number 1: CA21038-4-1
Alternate Part Number 2: 5325-01-444-3534
EXT Grommet - Passivated - L 0.135 Grip 0.096-0.115
$13.59 - $17.21 Price Details
Alternate Part Number 1: CA21038-4-2
Alternate Part Number 2: 5325-01-317-7436
EXT Grommet - Passivated - L 0.155 Grip 0.116-0.135
$14.29 - $18.08 Price Details
Alternate Part Number 1: CA21038-4-3
Alternate Part Number 2: 5325-01-298-9760
EXT Grommet - Cadmium Plated - L 0.115 Grip 0.075-0.095
$13.63 - $17.25 Price Details
Alternate Part Number 1: CA21038C-4-1
Alternate Part Number 2: 5325-01-053-9889
EXT Grommet - Cadmium Plated - L 0.135 Grip 0.096-0.115
$14.52 - $18.39 Price Details
Alternate Part Number 1: CA21038C-4-2
Alternate Part Number 2: 5325-01-145-7575
EXT Grommet - Cadmium Plated - L 0.155 Grip 0.116-0.135
$15.52 - $19.65 Price Details
Alternate Part Number 1: CA21038C-4-3
Alternate Part Number 2: 5325-01-099-5006
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