The Spring,helical,extension, cataloged under National Stock Number 5360-00-021-4918, is classified within Federal Supply Class 5360 (Coil, Flat, Leaf, and Wire Springs) of the Hardware and Abrasives group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5360-00-021-4918 |
| Item Name | Spring,helical,extension |
| FSC / FSG | 5360 / 53 — Coil, Flat, Leaf, and Wire Springs |
| Status | ACTIVE |
| Spring Free Outside Diameter | 0.550 INCHES NOMINAL IN |
| Load Rating | 5.000 POUNDS MINIMUM AND 6.200 POUNDS MAXIMUM LBS |
| End Style | RAISED HOOK FIRST END |
| End Style | RAISED HOOK SECOND END |
| Design Type | CLOSED |
| Style Designator | CYLINDRICAL |
| Opening Width | 0.190 INCHES NOMINAL FIRST END IN |
| Opening Width | 1.560 INCHES NOMINAL BOTH ENDS IN |
| Material Document and Classification | QQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Spring Free Length | 5.445 INCHES NOMINAL IN |
| Spring Deflection Rate | 1.000 POUNDS PER INCH NOMINAL LBS |
| Coil to Hook Inside Length | 2.000 INCHES NOMINAL SECOND END IN |
| Coil to Hook Inside Length | 0.590 INCHES NOMINAL FIRST END IN |
| Spring Length Under Load | 10.940 INCHES NOMINAL IN |
| Coil Quantity | 58 |
| Surface Treatment | CADMIUM OVERALL |
| Coil Helix Direction | RIGHT-HAND OR LEFT-HAND |
| Hook Radius | 0.220 INCHES NOMINAL BOTH ENDS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 26-508576-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5360-00-021-4918 is a Spring,helical,extension, classified under FSC 5360, Coil, Flat, Leaf, and Wire Springs. Status: active.
Key specifications for 5360-00-021-4918: Spring Free Outside Diameter: 0.550 INCHES NOMINAL IN; Load Rating: 5.000 POUNDS MINIMUM AND 6.200 POUNDS MAXIMUM LBS; End Style: RAISED HOOK FIRST END; End Style: RAISED HOOK SECOND END. 18 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.