The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-131-3920, 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7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5340-01-131-3920 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 0.5000 INCHES MINIMUM AND 0.5100 INCHES MAXIMUM IN |
| Material Hardness Rating | 35.0 ROCKWELL C MINIMUM |
| Distance From End to First Step | 0.0950 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Material Document and Classification | AMS 5642,TYPE 2 ASSN STD SINGLE MATERIAL RESPONSE |
| Counterbore Diameter | 0.2250 INCHES MINIMUM AND 0.2350 INCHES MAXIMUM IN |
| Material | STEEL UNS S34723 |
| 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 |
|---|---|
| 10160019 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 2010T03P01 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-01-131-3920 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): 5310-01-167-4057. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-01-131-3920: Overall Height: 0.1600 INCHES MINIMUM AND 0.1800 INCHES MAXIMUM IN; First Step Diameter: 0.5000 INCHES MINIMUM AND 0.5100 INCHES MAXIMUM IN; Material Hardness Rating: 35.0 ROCKWELL C MINIMUM; Distance From End to First Step: 0.0950 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM 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.