The Spring,helical,extension, cataloged under National Stock Number 5360-00-976-3928, is classified within Federal Supply Class 5360 (Coil, Flat, Leaf, and Wire Springs) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5360-00-976-3928 |
| Primary Part Number | 3-41421-1 |
| Item Name | Spring,helical,extension |
| FSC / FSG | 5360 / 53 — Coil, Flat, Leaf, and Wire Springs |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Spring Free Outside Diameter | 0.610 INCHES NOMINAL IN |
| Load Rating | 5.40 POUNDS NOMINAL LBS |
| End Style | SHORT TWISTED HOOK FIRST END |
| End Style | OFFSET HOOK, CENTER SECOND END |
| Design Type | CLOSED |
| Style Designator | CYLINDRICAL |
| Opening Width | 0.080 INCHES NOMINAL SECOND END IN |
| Material Document and Classification | AMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Spring Free Length | 3.962 INCHES NOMINAL IN |
| Spring Deflection Rate | 9.050 POUNDS PER INCH NOMINAL LBS |
| Inside Diameter | 0.458 INCHES NOMINAL IN |
| Spring Length Under Load | 4.190 INCHES NOMINAL IN |
| Coil Quantity | 31-1/2 |
| Coil Helix Direction | RIGHT-HAND |
| Material | STEEL COMP 631 OVERALL |
| Hook Radius | 0.260 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 |
|---|---|
| 3-41421-1 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| 3-41421-1 | Skyspares Parts Inc (USA) |
| Reference | Meaning |
|---|---|
| 3-41421-1 | 5/9 Secondary reference Western Spring and Mfg Co |
| 3-41421-1 | 5/9 Secondary reference Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
| 3-41421-1 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
NSN 5360-00-976-3928 is a Spring,helical,extension, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5360, Coil, Flat, Leaf, and Wire Springs. Status: active.
NSN 5360-00-976-3928 has 2 manufacturer part numbers on file: 3-41421-1 (Northrop Grumman Systems Corporation), 3-41421-1 (Skyspares Parts Inc).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-701-5684. Verify interchangeability with system specifications before substitution.
Key specifications for 3-41421-1: Spring Free Outside Diameter: 0.610 INCHES NOMINAL IN; Load Rating: 5.40 POUNDS NOMINAL LBS; End Style: SHORT TWISTED HOOK FIRST END; End Style: OFFSET HOOK, CENTER SECOND END. 16 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.