The Retainer,helical Compression Spr, cataloged under National Stock Number 5340-01-646-2988, 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 8 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 | 5340-01-646-2988 |
| Primary Part Number | 12446412 |
| Item Name | Retainer,helical Compression Spr |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Flange Diameter | 0.499 INCHES NOMINAL IN |
| Flange Thickness | 0.233 INCHES NOMINAL IN |
| Body Outside Diameter | 0.360 INCHES NOMINAL IN |
| Style Designator | PARALLEL |
| Body Inside Diameter | 0.25 INCHES NOMINAL IN |
| Outside Chamfer Angle in Deg | 45.0 |
| Material | STEEL |
| Outside Chamfer Depth | 0.020 INCHES NOMINAL IN |
| 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 |
|---|---|
| 12446412 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 5340-01-646-2988 is a Retainer,helical Compression Spr, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-646-2988 has 1 manufacturer part number on file: 12446412 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12446412: Flange Diameter: 0.499 INCHES NOMINAL IN; Overall Height: 0.843 INCHES NOMINAL IN; Flange Thickness: 0.233 INCHES NOMINAL IN; Body Outside Diameter: 0.360 INCHES NOMINAL IN. 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.
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.