The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-180-3540, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 13 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 | 5340-01-180-3540 |
| Primary Part Number | 12321048 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| First Step Diameter | 0.7500 INCHES NOMINAL IN |
| End Diameter | 0.7200 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| Distance From End to First Step | 0.2100 INCHES NOMINAL IN |
| Design Type | SOLID |
| Second Step Length | 0.0400 INCHES NOMINAL IN |
| Style Designator | SEAT |
| Material Document and Classification | QQ-S-763, CLASS 302 FED SPEC 1ST MATERIAL RESPONSE AND QQ-S-763, CLASS 304 FED SPEC 2ND MATERIAL RESPONSE |
| Second Step Diameter | 0.9600 INCHES NOMINAL IN |
| First Step Length | 0.0800 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE |
| Bore Diameter | 0.6400 INCHES NOMINAL IN |
| Material | STEEL COMP 302 OR STEEL COMP 304 |
| 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 |
|---|---|
| 12321048 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 5340-01-180-3540 is a Seat,helical Compression Spring, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-180-3540 has 1 manufacturer part number on file: 12321048 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12321048: Overall Height: 0.2500 INCHES NOMINAL IN; First Step Diameter: 0.7500 INCHES NOMINAL IN; End Diameter: 0.7200 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE. 13 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.