The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-491-4641, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 5340-01-491-4641 |
| Primary Part Number | 124-7120998 PC 9-82 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| First Step Diameter | 8.8750 INCHES NOMINAL IN |
| End Diameter | 7.0000 INCHES NOMINAL IN |
| Distance From End to First Step | 0.7500 INCHES NOMINAL IN |
| Design Type | SPLIT |
| Style Designator | SEAT |
| Bore Diameter | 0.8120 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 |
| Part Number | Manufacturer |
|---|---|
| 124-7120998 PC 9-82 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 124-7120998 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 5340-01-491-4641 is a Seat,helical Compression Spring, manufactured by Naval Sea Systems Command, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-491-4641 has 1 manufacturer part number on file: 124-7120998 PC 9-82 (Naval Sea Systems Command).
5 possible matches (shared part number, not a government interchangeability claim): 4010-01-491-5060, 5365-01-491-9536, 5365-01-491-9559. Verify interchangeability with system specifications before substitution.
Key specifications for 124-7120998 PC 9-82: Overall Height: 1.2500 INCHES NOMINAL IN; First Step Diameter: 8.8750 INCHES NOMINAL IN; End Diameter: 7.0000 INCHES NOMINAL IN; Distance From End to First Step: 0.7500 INCHES NOMINAL 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.