The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-221-5478, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 11 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 | 5340-00-221-5478 |
| Primary Part Number | 1076725 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| First Step Diameter | 1.1000 INCHES MINIMUM AND 1.1150 INCHES MAXIMUM IN |
| Material Hardness Rating | 56.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM |
| End Diameter | 0.8750 INCHES NOMINAL IN |
| Distance From End to First Step | 0.2190 INCHES MINIMUM AND 0.2340 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Counterbore Length | 0.1880 INCHES MINIMUM AND 0.2030 INCHES MAXIMUM IN |
| Counterbore Diameter | 0.8750 INCHES NOMINAL IN |
| Surface Treatment | PHOSPHATE |
| Bore Diameter | 0.4420 INCHES MINIMUM AND 0.4470 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 |
|---|---|
| 1076725 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
NSN 5340-00-221-5478 is a Seat,helical Compression Spring, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-221-5478 has 1 manufacturer part number on file: 1076725 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 1076725: Overall Height: 0.5150 INCHES NOMINAL IN; First Step Diameter: 1.1000 INCHES MINIMUM AND 1.1150 INCHES MAXIMUM IN; Material Hardness Rating: 56.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM; End Diameter: 0.8750 INCHES NOMINAL IN. 11 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.