The Heating Element,electrical,immer, cataloged under National Stock Number 4520-00-702-9353, 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 16 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-00-702-9353 |
| Primary Part Number | 157-040313-002 |
| 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 |
| Phase | THREE SINGLE VOLTAGE |
| Frequency in Hertz | 60.0 |
| Terminal Quantity | 3 |
| Voltage in Volts and Current Type | 440.0 AC SINGLE VOLTAGE |
| Body Style | THRU-THE-SIDE TYPE |
| Maximum Wattage Rating in Watts | 3000.0 SINGLE VOLTAGE |
| Terminal Length | 1.250 INCHES NOMINAL IN |
| Element Connection Style | STUD TYPE |
| Terminal Box Environmental Protection | MOISTURE RESISTANT |
| Heat Quantity | 1 |
| Watt Density Rating | 20.0 PER SQUARE INCH SINGLE VOLTAGE |
| Element Radiation Spectrum | NONINFRARED |
| Material | NICKEL ALLOY RESISTANCE WIRE |
| Material | STEEL SHEATH |
| Distance From Terminal Box | 3.000 INCHES NOMINAL IN |
| Element Quantity | 3 |
| 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 |
|---|---|
| 157-040313-002 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| TL0330X57 | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| 2-40313 | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| Reference | Meaning |
|---|---|
| AASK40313 | 5/1 Secondary reference Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
NSN 4520-00-702-9353 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 4520-00-702-9353 has 3 manufacturer part numbers on file: 157-040313-002 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), TL0330X57 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), 2-40313 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
2 possible matches (shared part number, not a government interchangeability claim): 4520-00-702-9354, 4520-00-722-4501. Verify interchangeability with system specifications before substitution.
Key specifications for 157-040313-002: Phase: THREE SINGLE VOLTAGE; Frequency in Hertz: 60.0; Terminal Quantity: 3; Voltage in Volts and Current Type: 440.0 AC SINGLE VOLTAGE. 16 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.