The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-222-8451, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5340-01-222-8451 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 1.5000 INCHES NOMINAL IN |
| Distance From End to First Step | 0.1875 INCHES NOMINAL IN |
| Style Designator | SEAT |
| Bore Diameter | 0.2500 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 |
|---|---|
| S4824H3157488 PIECE 13 | 3/2 Design control — primary reference U.S. Government activity |
| NMP-402 PIECE 13 | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| NMP402PC 7,10,1 | C/1 Advisory reference — outside the item-of-supply concept Kunkle Industries Inc Lonergan Valve Div |
| S4824H3157488 | D/9 Drawing number reference only U.S. Government activity |
| NMP-402 | D/9 Drawing number reference only Kunkle Industries Inc Lonergan Valve Div |
NSN 5340-01-222-8451 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): 5340-01-222-8452. Verify interchangeability with system specifications before substitution.
Key specifications for 5340-01-222-8451: Overall Height: 0.4375 INCHES NOMINAL IN; First Step Diameter: 1.5000 INCHES NOMINAL IN; Distance From End to First Step: 0.1875 INCHES NOMINAL IN; Style Designator: SEAT. 5 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.