The Heating Element,electrical,immer, cataloged under National Stock Number 4520-00-651-8757, 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 Chromalox Inc Dba Chromalox Precision Heat and Control, Inc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4520-00-651-8757 |
| Primary Part Number | 1-39029 |
| Item Name | Heating Element,electrical,immer |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| Status | ACTIVE |
| Flange Diameter | 13.500 INCHES NOMINAL IN |
| Terminal Quantity | 30 |
| Length | 27.000 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 500.0 AC SINGLE VOLTAGE |
| Body Style | FLANGE, TYPE |
| Hole or Slot Quantity | 8 |
| Flange Thickness | 1.125 INCHES NOMINAL IN |
| Maximum Wattage Rating in Watts | 45000.0 SINGLE VOLTAGE |
| Terminal Length | 0.562 INCHES NOMINAL IN |
| Element Connection Style | STUD TYPE |
| Terminal Box Environmental Protection | MOISTURE RESISTANT |
| Mounting Method Style | FLANGE TYPE MOUNTING FACILITY |
| Heat Quantity | 1 |
| Bolt Circle Diameter | 11.750 INCHES NOMINAL IN |
| Conduit Opening Size | 0.750 INCHES NOMINAL IN |
| Element Radiation Spectrum | NONINFRARED |
| Material | COPPER SHEATH |
| Material | NICKEL ALLOY RESISTANCE WIRE |
| Hole Diameter | 0.875 INCHES NOMINAL IN |
| Element Quantity | 15 |
| 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 |
|---|---|
| 67-17110PC87 | Johnson Controls Navy Systems, Llc (USA) |
| 1-39029 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| Reference | Meaning |
|---|---|
| 3300564PC54 | 5/2 Secondary reference U.S. Government activity |
| AASK39000PC54 | 5/1 Secondary reference Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
NSN 4520-00-651-8757 is a Heating Element,electrical,immer, manufactured by Chromalox Inc Dba Chromalox Precision Heat and Control, Inc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-00-651-8757 has 2 manufacturer part numbers on file: 67-17110PC87 (Johnson Controls Navy Systems, Llc), 1-39029 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
1 possible match (shared part number, not a government interchangeability claim): 5961-01-147-8972. Verify interchangeability with system specifications before substitution.
Key specifications for 1-39029: Flange Diameter: 13.500 INCHES NOMINAL IN; Terminal Quantity: 30; Length: 27.000 INCHES NOMINAL IN; Voltage in Volts and Current Type: 500.0 AC SINGLE VOLTAGE. 20 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.