The Coupler,drawbar,ring, cataloged under National Stock Number 2540-01-643-3393, is classified within Federal Supply Class 2540 (Vehicular Furniture and Accessories) of the Vehicular Equipment Components group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 18 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 | 2540-01-643-3393 |
| Primary Part Number | 12577731 |
| Item Name | Coupler,drawbar,ring |
| FSC / FSG | 2540 / 25 — Vehicular Furniture and Accessories |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Mounting Hole Quantity | 7 |
| Shank End Keyway | NOT PROVIDED |
| Color Chip Number | 33446 |
| Ring Inside Diameter | 4.625 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | FED STD 595 FED STD 2ND TREATMENT RESPONSE |
| Heat Treatment | TEMPERED AND QUENCHED |
| Style Designator | WITH MOUNTING HOLE FOR BOLT CONNECTION |
| Material Document and Classification | SAE AMS 6427 NATIONAL SPEC SINGLE MATERIAL RESPONSE |
| Mounting Hole Diameter | 1.125 INCHES NOMINAL IN |
| Painted Feature | INCLUDED |
| Height | 10.750 INCHES NOMINAL IN |
| Color | TAN, 686A A |
| Surface Treatment | PRIMER AND PAINTED |
| Width | 7.250 INCHES NOMINAL IN |
| Material | STEEL |
| Shank End Thread Provision | UNTHREADED |
| Ring Outside Diameter | 5.515 INCHES NOMINAL IN |
| Mounting Hole Type | COUNTERSUNK AND THRU HOLE |
| 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 |
|---|---|
| 12577731 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 2540-01-643-3393 is a Coupler,drawbar,ring, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2540, Vehicular Furniture and Accessories. Status: active.
NSN 2540-01-643-3393 has 1 manufacturer part number on file: 12577731 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12577731: Mounting Hole Quantity: 7; Shank End Keyway: NOT PROVIDED; Color Chip Number: 33446; Ring Inside Diameter: 4.625 INCHES NOMINAL IN. 18 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.