The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-977-2454, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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 | 5340-00-977-2454 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 1.0620 INCHES NOMINAL IN |
| Material Hardness Rating | 28.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| End Diameter | 0.7810 INCHES NOMINAL IN |
| Second End Diameter | 0.9150 INCHES MINIMUM AND 0.9200 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.1200 INCHES MINIMUM AND 0.1300 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Counterbore Length | 0.2200 INCHES NOMINAL IN |
| Counterbore Diameter | 0.8120 INCHES NOMINAL IN |
| First Step Length | 0.1620 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE |
| Bore Diameter | 0.6240 INCHES MINIMUM AND 0.6260 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 |
| Unit of Issue | EA |
| Reference | Meaning |
|---|---|
| 14445 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-00-977-2454 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
6 possible matches (shared part number, not a government interchangeability claim): 5330-00-999-7217, 5310-01-119-4854, 4720-01-503-8217. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-00-977-2454: Overall Height: 0.4320 INCHES MINIMUM AND 0.4420 INCHES MAXIMUM IN; First Step Diameter: 1.0620 INCHES NOMINAL IN; Material Hardness Rating: 28.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM; End Diameter: 0.7810 INCHES NOMINAL IN. 13 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.