The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-132-8990, 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13 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5340-01-132-8990 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| Countersink Angle in Deg | 30.0 |
| First Step Diameter | 0.7950 INCHES MINIMUM AND 0.8050 INCHES MAXIMUM IN |
| Material Hardness Rating | 32.0 ROCKWELL C NOMINAL |
| End Diameter | 0.7950 INCHES MINIMUM AND 0.8050 INCHES MAXIMUM IN |
| Countersink Diameter | 0.5570 INCHES MINIMUM AND 0.5670 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.6510 INCHES MINIMUM AND 0.6610 INCHES MAXIMUM IN |
| Design Type | SPLIT |
| Style Designator | SEAT |
| Material Document and Classification | ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE |
| Counterbore Length | 0.0890 INCHES MINIMUM AND 0.0990 INCHES MAXIMUM IN |
| Counterbore Diameter | 0.4380 INCHES MINIMUM AND 0.4540 INCHES MAXIMUM IN |
| Bore Diameter | 0.4380 INCHES MINIMUM AND 0.4400 INCHES MAXIMUM IN |
| Material | STEEL |
| 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 |
|---|---|
| 705712 | 5/9 Secondary reference U.S. Government activity |
| 705712A | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-01-132-8990 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): 5998-01-358-5250. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-01-132-8990: Overall Height: 0.7400 INCHES MINIMUM AND 0.7600 INCHES MAXIMUM IN; Countersink Angle in Deg: 30.0; First Step Diameter: 0.7950 INCHES MINIMUM AND 0.8050 INCHES MAXIMUM IN; Material Hardness Rating: 32.0 ROCKWELL C NOMINAL. 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.