The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-549-3369, 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7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5340-00-549-3369 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 1.1000 INCHES NOMINAL IN |
| End Diameter | 0.6950 INCHES NOMINAL IN |
| Distance From End to First Step | 0.3050 INCHES NOMINAL IN |
| Style Designator | SEAT |
| Material Document and Classification | AMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5659 ASSN STD 2ND MATERIAL RESPONSE |
| Bore Diameter | 0.6300 INCHES MINIMUM AND 0.6350 INCHES MAXIMUM IN |
| Material | STEEL COMP 630 OR STEEL COMP XM-12 |
| 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 |
|---|---|
| 41001026 | 3/2 Design control — primary reference U.S. Government activity |
| 9090885 | 7/2 Vendor item drawing reference Us Army Aviation and Missile Command |
NSN 5340-00-549-3369 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): 4810-00-777-6719, 8415-01-597-7940. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-00-549-3369: Overall Height: 0.3500 INCHES NOMINAL IN; First Step Diameter: 1.1000 INCHES NOMINAL IN; End Diameter: 0.6950 INCHES NOMINAL IN; Distance From End to First Step: 0.3050 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.