The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-604-4998, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-604-4998 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 1.0400 INCHES NOMINAL IN |
| End Diameter | 0.3755 INCHES MINIMUM AND 0.3765 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.7400 INCHES NOMINAL IN |
| Design Type | SOLID |
| Second Step Diameter | 1.9050 INCHES NOMINAL IN |
| First Step Length | 0.1080 INCHES NOMINAL IN |
| Material | COPPER ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Reference | Meaning |
|---|---|
| 50420PC5 | 5/9 Secondary reference U.S. Government activity |
| 30842 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-00-604-4998 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 6515-01-347-0903, 6515-01-458-4299. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-00-604-4998: Overall Height: 0.9400 INCHES NOMINAL IN; First Step Diameter: 1.0400 INCHES NOMINAL IN; End Diameter: 0.3755 INCHES MINIMUM AND 0.3765 INCHES MAXIMUM IN; Distance From End to First Step: 0.7400 INCHES NOMINAL IN. 7 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.