The Housing,heater Compartment, cataloged under National Stock Number 2540-01-646-3011, 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 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 2540-01-646-3011 |
| Primary Part Number | 12421779-101 |
| Item Name | Housing,heater Compartment |
| FSC / FSG | 2540 / 25 — Vehicular Furniture and Accessories |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Mounting Hole Quantity | 1 |
| Surface Treatment Document and Classification | TT-C-490,TYPE I FED SPEC 1ST TREATMENT RESPONSE OR TT-C-490 TYPE 3 FED SPEC 1ST TREATMENT RESPONSE AND MIL DTL 53084 MIL STD 1ST TREATMENT RESPONSE AND MIL DTL 53039 MIL STD 2ND TREATMENT RESPONSE OR MIL DTL 64159 MIL STD 2ND TREATMENT RESPONSE AND FED STD 595 FED STD 2ND TREATMENT RESPONSE |
| Heat Treatment | HOT ROLLED AND COLD ROLLED |
| Slot Quantity | 3 |
| Material Document and Classification | ASTM A1011/A1011,11GA ASSN STD 1ST MATERIAL RESPONSE AND ASTM A1011/A1011,6GA ASSN STD 2ND MATERIAL RESPONSE AND ASTM A513,TYPE 1 OR TYPE 2 ASSN STD 3RD MATERIAL RESPONSE AND ASTM A513,TYPE 1 OR 2 ASSN STD 4TH MATERIAL RESPONSE AND ASTM A513,TYPE 1 OR TYPE 2 ASSN STD 5TH MATERIAL RESPONSE |
| Mounting Hole Diameter | 18.5 MILLIMETERS NOMINAL ALL HOLES MM |
| Shape | IRREGULAR |
| Vehicle Identification Designator | LHS |
| Accessory Components and Quantity | 2 SCREW,HEX HEAD:12 WASHER,SPRING LOCK;12 WASHER,PLAIN,2 WASHER,FLAT;10 SCREW,HEX HEAD;12 NUT,HEAX HEAD;6 KEEPER ASSY;1 TUBE,COLD AIR(12421779-009);1 TUBE,COLD AIR(12421779-008)1 TUBE,COLD AIR RETAINER;1 TUBE,COLD AIR,PORT;1 BRACKET(12421779-003);1 BRACKET(12421779-002);1 PIPE HEATER(12421779-003);1 PIPE HEATER(12421779-002);1 CONTAINER,LOWER |
| Vehicle Design Control Activity | 19207 |
| Color | TAN |
| Surface Treatment | CHEMICAL AND PHOSPHATE ZINC OR PRIMER-HEXAVALENT CHROMIUM FREE AND CARC (CHEMICAL AGENT RESISTANT COATING), ALIPHATIC POLYURETHANE OR POLYURETHANE PAINT-LEAD,CADMIUM AND HEXAVALENT CHROMIUM FREE |
| Material | STEEL |
| Fabrication Method | WELDEDWELDED |
| Slot Width | 18.5 MILLIMETERS NOMINAL ALL HOLES MM |
| Slot Length | 25.0 MILLIMETERS NOMINAL ALL HOLES MM |
| Mounting Hole Type | PLAIN AND THRU HOLE AND SLOTTED |
| 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 |
|---|---|
| 12421779-101 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 12421779 | D/9 Drawing number reference only U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 2540-01-646-3011 is a Housing,heater Compartment, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2540, Vehicular Furniture and Accessories. Status: active.
NSN 2540-01-646-3011 has 1 manufacturer part number on file: 12421779-101 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12421779-101: Mounting Hole Quantity: 1; Overall Height: 244.5 MILLIMETERS NOMINAL MM; Surface Treatment Document and Classification: TT-C-490,TYPE I FED SPEC 1ST TREATMENT RESPONSE OR TT-C-490 TYPE 3 FED SPEC 1ST TREATMENT RESPONSE AND MIL DTL 53084 MIL STD 1ST TREATMENT RESPONSE AND MIL DTL 53039 MIL STD 2ND TREATMENT RESPONSE OR MIL DTL 64159 MIL STD 2ND TREATMENT RESPONSE AND FED STD 595 FED STD 2ND TREATMENT RESPONSE; Heat Treatment: HOT ROLLED AND COLD ROLLED. 17 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.