The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-235-1526, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5340-01-235-1526 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 5.7500 INCHES NOMINAL IN |
| Style Designator | SEAT |
| Bore Diameter | 3.6250 INCHES NOMINAL 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 |
|---|---|
| S-539 | D/9 Drawing number reference only U.S. Government activity |
| S-539 PIECE 27 | 5/9 Secondary reference U.S. Government activity |
| NK-287-1 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5340-01-235-1526 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): 3950-01-245-0575. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-01-235-1526: Overall Height: 2.0000 INCHES NOMINAL IN; First Step Diameter: 5.7500 INCHES NOMINAL IN; Style Designator: SEAT; Bore Diameter: 3.6250 INCHES NOMINAL IN. 4 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.