The Heating Element,electrical,immer, cataloged under National Stock Number 4520-01-327-9704, 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 Naval Sea Systems Command. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Heating Element,electrical,immer |
| FSC / FSG | 4520 — Space and Water Heating Equipment (FSG 45) |
| Manufacturers | Watlow Electric Manufacturing Co Dba Watlow (CAGE 79221); Naval Sea Systems Command (CAGE 53711) |
| Parameter | Value |
|---|---|
| NSN | 4520-01-327-9704 |
| Primary Part Number | 261-5750275-001 |
| Item Name | Heating Element,electrical,immer |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 00550092 | Watlow Electric Manufacturing Co Dba Watlow (USA) |
| 261-5750275-001 PRIMARY | Naval Sea Systems Command (USA) |
| 5750275-001 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| SK-3459-00550092 | 5/9 Secondary reference Watlow Electric Manufacturing Co Dba Watlow |
| SK-3459 | D/9 Drawing number reference only Watlow Electric Manufacturing Co Dba Watlow |
NSN 4520-01-327-9704 is a Heating Element,electrical,immer, manufactured by Naval Sea Systems Command, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-327-9704 has 3 manufacturer part numbers on file: 00550092 (Watlow Electric Manufacturing Co Dba Watlow), 261-5750275-001 (Naval Sea Systems Command), 5750275-001 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4520-01-327-9705. 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.