The Heating Element,electrical,immer, cataloged under National Stock Number 4520-00-722-4501, 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 21 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4520-00-722-4501 |
| Primary Part Number | 3-40313 |
| 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 | 6 |
| Voltage in Volts and Current Type | 440.0 AC SINGLE VOLTAGE |
| Horizontal Leg Length | 25.000 INCHES NOMINAL IN |
| Body Style | THRU-THE-SIDE TYPE |
| Maximum Wattage Rating in Watts | 3000.0 SINGLE VOLTAGE |
| Terminal Length | 1.250 INCHES NOMINAL IN |
| Vertical Leg Length | 23.000 INCHES NOMINAL IN |
| Element Connection Style | STUD TYPE |
| Terminal Box Environmental Protection | MOISTURE RESISTANT |
| Nominal Thread Size | 0.250 INCHES STUD IN |
| 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 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) STUD |
| Distance From Terminal Box | 3.000 INCHES NOMINAL IN |
| Thread Quantity | 20.0 PER INCH STUD |
| 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 |
|---|---|
| TL0330X58 | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| 3-40313 PRIMARY | 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 |
| 3-40313 CAST FE RALL0Y ENCL | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 4520-00-722-4501 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 4520-00-722-4501 has 2 manufacturer part numbers on file: TL0330X58 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), 3-40313 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
3 possible matches (shared part number, not a government interchangeability claim): 2915-00-983-2462, 5340-01-414-2936, 5920-01-528-9140. Verify interchangeability with system specifications before substitution.
Key specifications for 3-40313: Phase: THREE SINGLE VOLTAGE; Frequency in Hertz: 60.0; Terminal Quantity: 6; Voltage in Volts and Current Type: 440.0 AC SINGLE VOLTAGE. 21 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.