The Heating Element,electrical,immer, cataloged under National Stock Number 4520-00-540-3361, 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 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 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 | 4520-00-540-3361 |
| Primary Part Number | TI23X402 |
| 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 | SINGLE SINGLE VOLTAGE |
| Frequency in Hertz | 60.0 |
| Terminal Quantity | 2 |
| Length | 10.188 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 220.0 AC SINGLE VOLTAGE |
| Body Style | TUBULAR, DOUBLE TERMINALS |
| Maximum Wattage Rating in Watts | 500.0 SINGLE VOLTAGE |
| Terminal Length | 0.375 INCHES NOMINAL IN |
| Mounting Facility Length | 0.750 INCHES NOMINAL IN |
| Element Connection Style | STUD TYPE |
| Effective Heating Length | 10.188 INCHES NOMINAL IN |
| Mounting Method Style | AXIAL STUD TYPE MOUNTING FACILITY |
| Nominal Thread Size | 0.190 INCHES STUD IN |
| Nominal Thread Size | 0.375 INCHES MOUNTING FACILITY IN |
| Heat Quantity | 1 |
| Element Radiation Spectrum | NONINFRARED |
| Width | 1.875 INCHES NOMINAL IN |
| Material | MAGNESIUM OXIDE RESISTANCE WIRE EMBEDDING/SUPPORT INSULATION |
| Material | NICKEL AND CHROMIUM RESISTANCE WIRE |
| Material | NICKEL AND CHROMIUM SHEATH |
| Thread Series Designator | UNF STUD |
| Thread Series Designator | NPT MOUNTING FACILITY |
| Thread Quantity | 32.0 PER INCH MOUNTING FACILITY |
| Thread Quantity | 32.0 PER INCH STUD |
| 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 |
NSN 4520-00-540-3361 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 4520-00-540-3361 has 2 manufacturer part numbers on file: TI23X402 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), 1-61777 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5307-00-712-9449, 5845-01-657-5901. Verify interchangeability with system specifications before substitution.
Key specifications for TI23X402: Phase: SINGLE SINGLE VOLTAGE; Frequency in Hertz: 60.0; Terminal Quantity: 2; Length: 10.188 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.