The Spring,helical,extension, cataloged under National Stock Number 5360-00-321-3499, is classified within Federal Supply Class 5360 (Coil, Flat, Leaf, and Wire Springs) of the Hardware and Abrasives group. The manufacturer of record is Kelly Manufacturing Company. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5360-00-321-3499 |
| Primary Part Number | A1126 |
| Item Name | Spring,helical,extension |
| FSC / FSG | 5360 / 53 — Coil, Flat, Leaf, and Wire Springs |
| Manufacturer | Kelly Manufacturing Company |
| Status | ACTIVE |
| Spring Free Outside Diameter | 0.200 INCHES MAXIMUM IN |
| Load Rating | 0.181 POUNDS MINIMUM AND 0.190 POUNDS MAXIMUM LBS |
| End Style | FULL LOOP BOTH ENDS |
| Design Type | CLOSED |
| Style Designator | CYLINDRICAL |
| Material Document and Classification | QQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Spring Free Length | 0.454 INCHES MAXIMUM IN |
| Coil to Hook Inside Length | 0.176 INCHES MAXIMUM BOTH ENDS IN |
| Inside Diameter | 0.176 INCHES MAXIMUM IN |
| Spring Length Under Load | 0.562 INCHES NOMINAL IN |
| Coil Quantity | 7-1/2 |
| Coil Helix Direction | LEFT-HAND |
| Material | STEEL UNS K08500 OVERALL |
| Hook Radius | 0.088 INCHES MAXIMUM 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 |
| Part Number | Manufacturer |
|---|---|
| A1126 PRIMARY | Kelly Manufacturing Company (USA) |
| Reference | Meaning |
|---|---|
| A1126 | 5/9 Secondary reference Allen R C Co Inc Cash Register Div |
| A1126 | 5/9 Secondary reference Allen R C Instruments Inc |
NSN 5360-00-321-3499 is a Spring,helical,extension, manufactured by Kelly Manufacturing Company, classified under FSC 5360, Coil, Flat, Leaf, and Wire Springs. Status: active.
NSN 5360-00-321-3499 has 1 manufacturer part number on file: A1126 (Kelly Manufacturing Company).
7 possible matches (shared part number, not a government interchangeability claim): 5995-00-456-2746, 4820-00-848-9477, 5365-00-863-3596. Verify interchangeability with system specifications before substitution.
Key specifications for A1126: Spring Free Outside Diameter: 0.200 INCHES MAXIMUM IN; Load Rating: 0.181 POUNDS MINIMUM AND 0.190 POUNDS MAXIMUM LBS; End Style: FULL LOOP BOTH ENDS; Design Type: CLOSED. 14 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.