The Heating Element,electrical,immer, cataloged under National Stock Number 4520-01-075-5037, 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 Watlow Electric Manufacturing Co Dba Watlow. Government technical data includes 25 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4520-01-075-5037 |
| Primary Part Number | 3-32-80-1 |
| Item Name | Heating Element,electrical,immer |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Watlow Electric Manufacturing Co Dba Watlow |
| Status | ACTIVE |
| Phase | SINGLE SINGLE VOLTAGE |
| Frequency in Hertz | 60.0 |
| Terminal Quantity | 2 |
| Length | 9.812 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 115.0 AC SINGLE VOLTAGE |
| Body Style | TUBULAR, FLANGED |
| Hole or Slot Quantity | 4 |
| Flange Thickness | 0.188 INCHES NOMINAL IN |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 2.250 INCHES NOMINAL IN |
| Maximum Wattage Rating in Watts | 140.0 SINGLE VOLTAGE |
| Terminal Length | 0.750 INCHES NOMINAL IN |
| Mounting Facility Length | 2.625 INCHES NOMINAL IN |
| Element Connection Style | STUD TYPE |
| Effective Heating Length | 8.062 INCHES NOMINAL IN |
| Mounting Method Style | FLANGE TYPE MOUNTING FACILITY |
| Nominal Thread Size | 0.125 INCHES STUD IN |
| Heat Quantity | 1 |
| Element Radiation Spectrum | NONINFRARED |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 0.875 INCHES NOMINAL IN |
| Material | NICKEL ALLOY SHEATH |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) STUD |
| Mounting Facility Width | 1.250 INCHES NOMINAL IN |
| Thread Quantity | 40.0 PER INCH STUD |
| Hole Diameter | 0.206 INCHES NOMINAL IN |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 563861 | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| 3-32-80-1 PRIMARY | Watlow Electric Manufacturing Co Dba Watlow (USA) |
| Reference | Meaning |
|---|---|
| 3152980-1 | 5/9 Secondary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| 563861-001 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 4520-01-075-5037 is a Heating Element,electrical,immer, manufactured by Watlow Electric Manufacturing Co Dba Watlow, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-075-5037 has 2 manufacturer part numbers on file: 563861 (Lockheed Martin Corporation Div Rms - Mitchel Field), 3-32-80-1 (Watlow Electric Manufacturing Co Dba Watlow).
1 possible match (shared part number, not a government interchangeability claim): 5325-01-542-2948. Verify interchangeability with system specifications before substitution.
Key specifications for 3-32-80-1: Phase: SINGLE SINGLE VOLTAGE; Frequency in Hertz: 60.0; Terminal Quantity: 2; Length: 9.812 INCHES NOMINAL IN. 25 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.