The Heater,vehicular,compartment, cataloged under National Stock Number 2540-01-421-4591, 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 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 2540-01-421-4591 |
| Primary Part Number | 12420496-001 |
| Item Name | Heater,vehicular,compartment |
| FSC / FSG | 2540 / 25 — Vehicular Furniture and Accessories |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Heat Delivery Rate | 33120.0 BRITISH THERMAL UNIT |
| Current Type | DC |
| Heat Medium Type | HOT WATER |
| Voltage in Volts | 24.0 |
| Heat Outlet Quantity | 5 |
| Heat Delivery Direction | HORIZONTAL |
| Height | 355.0 MILLIMETERS NOMINAL MM |
| Outlet Position | ANY ACCEPTABLE |
| Mounting Type | FLOOR SURFACE, FREE STANDING, DUCTED |
| Heating Element Type | HOT WATER COIL |
| Current Rating in Amps | 14.583 |
| 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 |
|---|---|
| 12420496-001 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 936185 | 5/9 Secondary reference Austin-Westran Llc |
| 782705 | 3/2 Design control — primary reference U.S. Government activity |
| 12420496 | D/9 Drawing number reference only U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 2540-01-421-4591 is a Heater,vehicular,compartment, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2540, Vehicular Furniture and Accessories. Status: active.
NSN 2540-01-421-4591 has 1 manufacturer part number on file: 12420496-001 (U S Army Tank Automotive Command Amsta-Im-Mm).
1 possible match (shared part number, not a government interchangeability claim): 2540-01-530-2348. Verify interchangeability with system specifications before substitution.
Key specifications for 12420496-001: Heat Delivery Rate: 33120.0 BRITISH THERMAL UNIT; Current Type: DC; Heat Medium Type: HOT WATER; Voltage in Volts: 24.0. 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.