The Spring,helical,extension, cataloged under National Stock Number 5360-00-663-2985, is classified within Federal Supply Class 5360 (Coil, Flat, Leaf, and Wire Springs) of the Hardware and Abrasives group. The manufacturer of record is Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 17 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5360-00-663-2985 |
| Primary Part Number | S1620-65179 |
| Item Name | Spring,helical,extension |
| FSC / FSG | 5360 / 53 — Coil, Flat, Leaf, and Wire Springs |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Spring Free Outside Diameter | 0.375 INCHES NOMINAL IN |
| Load Rating | 7.580 POUNDS NOMINAL LBS |
| End Style | RAISED HOOK SECOND END |
| End Style | OFSET HOOK FIRST END |
| Design Type | CLOSED |
| Style Designator | CYLINDRICAL |
| Opening Width | 0.500 INCHES NOMINAL FIRST END IN |
| Opening Width | 0.125 INCHES NOMINAL BOTH ENDS IN |
| Material Document and Classification | MIL-W-6101 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Spring Free Length | 1.770 INCHES NOMINAL IN |
| Coil to Hook Inside Length | 0.250 INCHES NOMINAL FIRST END IN |
| Coil to Hook Inside Length | 0.272 INCHES NOMINAL SECOND END IN |
| Spring Length Under Load | 3.375 INCHES NOMINAL IN |
| Coil Quantity | 26 |
| Surface Treatment | CADMIUM OVERALL |
| Coil Helix Direction | RIGHT-HAND OR LEFT-HAND |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| S1620-65179 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
NSN 5360-00-663-2985 is a Spring,helical,extension, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5360, Coil, Flat, Leaf, and Wire Springs. Status: active.
NSN 5360-00-663-2985 has 1 manufacturer part number on file: S1620-65179 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for S1620-65179: Spring Free Outside Diameter: 0.375 INCHES NOMINAL IN; Load Rating: 7.580 POUNDS NOMINAL LBS; End Style: RAISED HOOK SECOND END; End Style: OFSET HOOK FIRST END. 17 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.