The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-477-2560, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5340-01-477-2560 |
| Primary Part Number | 74A400566-2001 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| First Step Diameter | 2.2500 INCHES NOMINAL IN |
| End Diameter | 1.3600 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE |
| Counterbore Length | 0.2500 INCHES NOMINAL IN |
| Counterbore Diameter | 1.1750 INCHES NOMINAL IN |
| Bore Diameter | 0.8800 INCHES NOMINAL IN |
| Material | STEEL COMP 630 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| 74A400566-2001 | Goodrich Corporation (USA) |
| 74A400566-2001 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 74A400566-2001 | 5/9 Secondary reference Goodrich Corp Dba Goodrich Corp |
NSN 5340-01-477-2560 is a Seat,helical Compression Spring, manufactured by The Boeing Company Div Defense, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-477-2560 has 2 manufacturer part numbers on file: 74A400566-2001 (Goodrich Corporation), 74A400566-2001 (The Boeing Company Div Defense).
Key specifications for 74A400566-2001: Overall Height: 0.3400 INCHES NOMINAL IN; First Step Diameter: 2.2500 INCHES NOMINAL IN; End Diameter: 1.3600 INCHES NOMINAL IN; Criticality Code Justification: AGAV. 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.
NSN 5340-01-477-2560 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.