The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-178-0939, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Eaton Aerospace, Llc Dba Jackson South. 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.
| Parameter | Value |
|---|---|
| NSN | 5340-00-178-0939 |
| Primary Part Number | 320402 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Eaton Aerospace, Llc Dba Jackson South |
| Status | ACTIVE |
| FSC Application Data | STARTER,ENGINE,HYDRAULIC |
| First Step Diameter | 0.8910 INCHES MINIMUM AND 0.8950 INCHES MAXIMUM IN |
| Material Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM |
| End Diameter | 0.3280 INCHES MINIMUM AND 0.3330 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.2200 INCHES MINIMUM AND 0.2270 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Material Document and Classification | QQ-S-624,COMPOSITION 4150 FED SPEC SINGLE MATERIAL RESPONSE |
| Material | STEEL COMP 4150 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 320402 PRIMARY | Eaton Aerospace, Llc Dba Jackson South (USA) |
NSN 5340-00-178-0939 is a Seat,helical Compression Spring, manufactured by Eaton Aerospace, Llc Dba Jackson South, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-178-0939 has 1 manufacturer part number on file: 320402 (Eaton Aerospace, Llc Dba Jackson South).
Key specifications for 320402: Overall Height: 0.2850 INCHES MINIMUM AND 0.2870 INCHES MAXIMUM IN; FSC Application Data: STARTER,ENGINE,HYDRAULIC; First Step Diameter: 0.8910 INCHES MINIMUM AND 0.8950 INCHES MAXIMUM IN; Material Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM. 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.