The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-156-9427, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5340-01-156-9427 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| Countersink Angle in Deg | 44.0 |
| First Step Diameter | 0.4150 INCHES MINIMUM AND 0.4250 INCHES MAXIMUM IN |
| End Diameter | 0.2680 INCHES MINIMUM AND 0.2700 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.0870 INCHES MINIMUM AND 0.1050 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Surface Treatment | SILVER |
| Chamfer Angle in Deg | 29.0 |
| Bore Diameter | 0.1250 INCHES MINIMUM AND 0.1255 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 |
|---|---|
| 1062-59 | 3/9 Design control — primary reference Goodrich Control Systems Ltd T/a Goodrich Engine Control Systems |
NSN 5340-01-156-9427 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): 5985-01-527-8465. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-01-156-9427: Overall Height: 0.1600 INCHES MINIMUM AND 0.1800 INCHES MAXIMUM IN; Countersink Angle in Deg: 44.0; First Step Diameter: 0.4150 INCHES MINIMUM AND 0.4250 INCHES MAXIMUM IN; End Diameter: 0.2680 INCHES MINIMUM AND 0.2700 INCHES MAXIMUM IN. 10 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.