The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-657-8345, 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 10 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. 2 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 | 5340-00-657-8345 |
| Primary Part Number | 178060 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Eaton Aerospace, Llc Dba Jackson South |
| Status | ACTIVE |
| FSC Application Data | PUMP UNIT,RECIPROCATING 4320006846070 P/N AA19529B |
| First Step Diameter | 0.5937 INCHES NOMINAL IN |
| End Diameter | 0.4210 INCHES NOMINAL IN |
| Distance From End to First Step | 0.0980 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Counterbore Length | 0.0310 INCHES MINIMUM AND 0.0410 INCHES MAXIMUM IN |
| Counterbore Diameter | 0.3700 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN |
| Bore Diameter | 0.2830 INCHES MINIMUM AND 0.2880 INCHES MAXIMUM 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 |
|---|---|
| 178060 PRIMARY | Eaton Aerospace, Llc Dba Jackson South (USA) |
NSN 5340-00-657-8345 is a Seat,helical Compression Spring, manufactured by Eaton Aerospace, Llc Dba Jackson South, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-657-8345 has 1 manufacturer part number on file: 178060 (Eaton Aerospace, Llc Dba Jackson South).
2 possible matches (shared part number, not a government interchangeability claim): 1560-01-515-4922, 5935-01-672-7655. Verify interchangeability with system specifications before substitution.
Key specifications for 178060: Overall Height: 0.1870 INCHES NOMINAL IN; FSC Application Data: PUMP UNIT,RECIPROCATING 4320006846070 P/N AA19529B; First Step Diameter: 0.5937 INCHES NOMINAL IN; End Diameter: 0.4210 INCHES NOMINAL IN. 10 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.