The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-352-6423, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-352-6423 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 2.6210 INCHES MINIMUM AND 2.6230 INCHES MAXIMUM IN |
| Material Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM |
| End Diameter | 2.3390 INCHES MINIMUM AND 2.3590 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| Distance From End to First Step | 0.0700 INCHES NOMINAL IN |
| Design Type | SOLID |
| Material Document and Classification | AMS 5659 ASSN STD SINGLE MATERIAL RESPONSE |
| Second Step Diameter | 3.4900 INCHES MINIMUM AND 3.5100 INCHES MAXIMUM IN |
| First Step Length | 0.1930 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE |
| Bore Diameter | 2.1670 INCHES MINIMUM AND 2.1870 INCHES MAXIMUM 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 |
| Reference | Meaning |
|---|---|
| 748903 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-01-352-6423 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
Key specifications for 5340-01-352-6423: Overall Height: 0.3580 INCHES NOMINAL IN; First Step Diameter: 2.6210 INCHES MINIMUM AND 2.6230 INCHES MAXIMUM IN; Material Hardness Rating: 35.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM; End Diameter: 2.3390 INCHES MINIMUM AND 2.3590 INCHES MAXIMUM IN. 12 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.