The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-499-5954, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company. Government technical data includes 8 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. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-499-5954 |
| Primary Part Number | 145H7317-2 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| First Step Diameter | 0.9950 INCHES NOMINAL IN |
| End Diameter | 0.7150 INCHES NOMINAL IN |
| Second Step Length | 0.0600 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5659 ASSN STD SINGLE MATERIAL RESPONSE |
| Second Step Diameter | 1.2100 INCHES NOMINAL IN |
| First Step Length | 1.0000 INCHES NOMINAL IN |
| Bore Diameter | 0.4700 INCHES NOMINAL IN |
| Material | STEEL COMP XM-12 |
| 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 |
|---|---|
| 145H7317-2 PRIMARY | The Boeing Company (USA) |
NSN 5340-01-499-5954 is a Seat,helical Compression Spring, manufactured by The Boeing Company, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-499-5954 has 1 manufacturer part number on file: 145H7317-2 (The Boeing Company).
Key specifications for 145H7317-2: First Step Diameter: 0.9950 INCHES NOMINAL IN; End Diameter: 0.7150 INCHES NOMINAL IN; Second Step Length: 0.0600 INCHES NOMINAL IN; Material Document and Classification: AMS 5659 ASSN STD SINGLE MATERIAL RESPONSE. 8 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.