The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-474-9677, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5340-00-474-9677 |
| Primary Part Number | A261666 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| FSC Application Data | ENGINE,GASOLINE,NON-AIRCRAFT BE15 21 |
| First Step Diameter | 1.1880 INCHES NOMINAL IN |
| Material Hardness Rating | 89.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 91.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM |
| End Diameter | 0.8200 INCHES MINIMUM AND 0.8250 INCHES MAXIMUM IN |
| Second End Diameter | 0.9730 INCHES MINIMUM AND 0.9780 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.1850 INCHES MINIMUM AND 0.1910 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Features Provided | CASEHARDENED |
| First Step Length | 0.0630 INCHES NOMINAL IN |
| Bore Diameter | 0.7000 INCHES MINIMUM AND 0.7050 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 |
| Part Number | Manufacturer |
|---|---|
| A261666 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 1411030 | 3/9 Design control — primary reference General Motors Corp |
| 1411030 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
NSN 5340-00-474-9677 is a Seat,helical Compression Spring, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-474-9677 has 1 manufacturer part number on file: A261666 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for A261666: Overall Height: 0.3750 INCHES NOMINAL IN; FSC Application Data: ENGINE,GASOLINE,NON-AIRCRAFT BE15 21; First Step Diameter: 1.1880 INCHES NOMINAL IN; Material Hardness Rating: 89.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 91.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM. 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.