The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-339-3170, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Unique Systems Inc. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 21 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-339-3170 |
| Primary Part Number | NH30057-81 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Unique Systems Inc |
| Status | ACTIVE |
| First Step Diameter | 1.2500 INCHES NOMINAL IN |
| End Diameter | 0.7500 INCHES NOMINAL IN |
| Distance From End to First Step | 0.1525 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Bore Diameter | 0.2600 INCHES NOMINAL 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 |
|---|---|
| NH30073PC81 | Elliott Company Div Jeannette (USA) |
| NH30057PC81 | Elliott Company Div Jeannette (USA) |
| NH30045PC78 | Elliott Company Div Jeannette (USA) |
| CVB41S5601-2PC81 | Naval Sea Systems Command (USA) |
| 640-54PC78 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| NH30067PC81 | Elliott Company Div Jeannette (USA) |
| DD692S5601-7PC81 | Naval Sea Systems Command (USA) |
| CV9S5601-06PC78 | Naval Sea Systems Command (USA) |
| NH30069PC81 | Elliott Company Div Jeannette (USA) |
| NH30055PC81 | Elliott Company Div Jeannette (USA) |
| NH30081PC81 | Elliott Company Div Jeannette (USA) |
| CV9S5601-6PC78 | Naval Sea Systems Command (USA) |
| CV9S5601-2PC78 | Naval Sea Systems Command (USA) |
| W98070PC21 | Elliott Company Div Jeannette (USA) |
| NH30057-81 PRIMARY | Unique Systems Inc (USA) |
| CVB41S5601-8PC81 | Naval Sea Systems Command (USA) |
| NH30079PC81 | Elliott Company Div Jeannette (USA) |
| DD692S5601-2PC81 | Naval Sea Systems Command (USA) |
| NH30075PC81 | Elliott Company Div Jeannette (USA) |
| CV9S5601-02PC78 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| DD692S5601-7PC81 | 5/9 Secondary reference U.S. Government activity |
| CV9S5601-06PC78 | 5/9 Secondary reference U.S. Government activity |
| CV9S5601-02PC78 | 5/9 Secondary reference U.S. Government activity |
| CVB41S5601-2PC81 | 5/9 Secondary reference U.S. Government activity |
| CV9S5601-6PC78 | 5/9 Secondary reference U.S. Government activity |
| CVB41S5601-8PC81 | 5/9 Secondary reference U.S. Government activity |
| NH30057-81 | 5/9 Secondary reference Elliott Company Div Jeannette |
| DD692S5601-2PC81 | 5/9 Secondary reference U.S. Government activity |
| CV9S5601-2PC78 | 5/9 Secondary reference U.S. Government activity |
NSN 5340-00-339-3170 is a Seat,helical Compression Spring, manufactured by Unique Systems Inc, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-339-3170 has 21 manufacturer part numbers on file: NH30073PC81 (Elliott Company Div Jeannette), NH30057PC81 (Elliott Company Div Jeannette), NH30045PC78 (Elliott Company Div Jeannette), CVB41S5601-2PC81 (Naval Sea Systems Command), 640-54PC78 (Huntington Ingalls Inc Div Newport News Shipbuilding) and 16 more.
Key specifications for NH30057-81: Overall Height: 0.3400 INCHES NOMINAL IN; First Step Diameter: 1.2500 INCHES NOMINAL IN; End Diameter: 0.7500 INCHES NOMINAL IN; Distance From End to First Step: 0.1525 INCHES NOMINAL IN. 7 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.