The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-129-8516, 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13 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-129-8516 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| Countersink Angle in Deg | 45.0 |
| First Step Diameter | 0.5000 INCHES NOMINAL IN |
| End Diameter | 0.2890 INCHES NOMINAL IN |
| Countersink Diameter | 0.2630 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | PS13201, CLASS 1, TYPE 2, MCDONNELL DOUGLAS CORP MFR REF SINGLE TREATMENT RESPONSE |
| Distance From End to First Step | 0.1700 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | QQ-A-225/6, ALLOY 2024 FED SPEC SINGLE MATERIAL RESPONSE |
| Surface Treatment | ANODIZE |
| Chamfer Angle in Deg | 30.0 |
| Bore Diameter | 0.2030 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 2024 |
| 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 |
|---|---|
| 10112548 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 36645 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-01-129-8516 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5330-01-330-2098. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-01-129-8516: Overall Height: 0.2100 INCHES NOMINAL IN; Countersink Angle in Deg: 45.0; First Step Diameter: 0.5000 INCHES NOMINAL IN; End Diameter: 0.2890 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.