The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-179-6429, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5340-00-179-6429 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 0.4335 INCHES MINIMUM AND 0.4355 INCHES MAXIMUM IN |
| End Diameter | 0.3650 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.3550 INCHES MINIMUM AND 0.3650 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Surface Treatment | PASSIVATE |
| Test Data Document | 81349-MIL-I-6868 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Bore Diameter | 0.2350 INCHES MINIMUM AND 0.2450 INCHES MAXIMUM IN |
| Material | STEEL CORROSION RESISTING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 42578-2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-00-179-6429 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
Key specifications for 5340-00-179-6429: Overall Height: 0.4380 INCHES MINIMUM AND 0.4400 INCHES MAXIMUM IN; First Step Diameter: 0.4335 INCHES MINIMUM AND 0.4355 INCHES MAXIMUM IN; End Diameter: 0.3650 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN; Distance From End to First Step: 0.3550 INCHES MINIMUM AND 0.3650 INCHES MAXIMUM IN. 8 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.