The Heater, cataloged under National Stock Number 4520-01-137-1137, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Columbia Machine Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Heater |
| FSC / FSG | 4520 — Space and Water Heating Equipment (FSG 45) |
| Manufacturers | Columbia Machine Inc (CAGE 34462) |
| Parameter | Value |
|---|---|
| NSN | 4520-01-137-1137 |
| Primary Part Number | H1041 |
| Item Name | Heater |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Columbia Machine Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| H1041 PRIMARY | Columbia Machine Inc (USA) |
NSN 4520-01-137-1137 is a Heater, manufactured by Columbia Machine Inc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-137-1137 has 1 manufacturer part number on file: H1041 (Columbia Machine Inc).
1 possible match (shared part number, not a government interchangeability claim): 5999-01-167-8557. Verify interchangeability with system specifications before substitution.
No hazard code in the DLA record (HMIC N). 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.