The Spring,helical,extension, cataloged under National Stock Number 5360-00-312-0447, is classified within Federal Supply Class 5360 (Coil, Flat, Leaf, and Wire Springs) of the Hardware and Abrasives group. The manufacturer of record is Chestnut Group Inc. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5360-00-312-0447 |
| Primary Part Number | 404820 |
| Item Name | Spring,helical,extension |
| FSC / FSG | 5360 / 53 — Coil, Flat, Leaf, and Wire Springs |
| Manufacturer | Chestnut Group Inc |
| Status | ACTIVE |
| Spring Free Outside Diameter | 0.750 INCHES NOMINAL IN |
| End Style | SWIVEL HOOK BOTH ENDS |
| Design Type | CLOSED |
| Style Designator | CONVEX |
| Material Document and Classification | QQ-W-474,COMP A /D/ FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Spring Free Length | 5.750 INCHES MINIMUM AND 5.875 INCHES MAXIMUM IN |
| Coil Quantity | 24-1/2 |
| Surface Treatment | PAINT OVERALL |
| Coil Helix Direction | RIGHT-HAND OR LEFT-HAND |
| Material | STEEL OVERALL |
| Hook Radius | 0.250 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 |
| Part Number | Manufacturer |
|---|---|
| 404820 PRIMARY | Chestnut Group Inc (USA) |
| Reference | Meaning |
|---|---|
| 404820 | 5/9 Secondary reference Abm Equipment, Llc |
NSN 5360-00-312-0447 is a Spring,helical,extension, manufactured by Chestnut Group Inc, classified under FSC 5360, Coil, Flat, Leaf, and Wire Springs. Status: active.
NSN 5360-00-312-0447 has 1 manufacturer part number on file: 404820 (Chestnut Group Inc).
1 possible match (shared part number, not a government interchangeability claim): 6625-01-432-2046. Verify interchangeability with system specifications before substitution.
Key specifications for 404820: Spring Free Outside Diameter: 0.750 INCHES NOMINAL IN; End Style: SWIVEL HOOK BOTH ENDS; Design Type: CLOSED; Style Designator: CONVEX. 11 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.