The Heating Element,electrical,nonim, cataloged under National Stock Number 4520-00-937-7644, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4520-00-937-7644 |
| Item Name | Heating Element,electrical,nonim |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Status | ACTIVE |
| Terminal Quantity | 2 |
| Length | 2.348 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 120.0 DC FIRST VOLTAGE |
| Voltage in Volts and Current Type | 240.0 DC SECOND VOLTAGE |
| Body Style | TUBULAR, PLAIN |
| Maximum Wattage Rating in Watts | 165.0 SINGLE VOLTAGE |
| Terminal Length | 10.000 INCHES NOMINAL IN |
| Element Connection Style | WIRE LEAD |
| Outside Diameter | 0.375 INCHES NOMINAL IN |
| Effective Heating Length | 2.375 INCHES NOMINAL IN |
| Heat Quantity | 1 |
| Watt Density Rating | 85.0 PER SQUARE INCH SINGLE VOLTAGE |
| Element Radiation Spectrum | NONINFRARED |
| Material | CHROMIUM AND IRON AND NICKEL SHEATH |
| Element Quantity | 1 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| C1-203 | 3/9 Design control — primary reference Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
NSN 4520-00-937-7644 is a Heating Element,electrical,nonim, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 2990-01-151-8115. Verify interchangeability with system specifications before substitution.
Key specifications for 4520-00-937-7644: Terminal Quantity: 2; Length: 2.348 INCHES NOMINAL IN; Voltage in Volts and Current Type: 120.0 DC FIRST VOLTAGE; Voltage in Volts and Current Type: 240.0 DC SECOND VOLTAGE. 15 specifications are documented in the U.S. Government catalog.
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.