The Heating Element,electrical,nonim, cataloged under National Stock Number 4520-00-918-9974, 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 22 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4520-00-918-9974 |
| Primary Part Number | 3-43084 |
| Item Name | Heating Element,electrical,nonim |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| Status | ACTIVE |
| Terminal Quantity | 2 |
| Length | 33.125 INCHES MINIMUM AND 33.625 INCHES MAXIMUM IN |
| Voltage in Volts and Current Type | 254.0 DC SINGLE VOLTAGE |
| Body Style | TUBULAR, THREADED TERMINALS |
| Maximum Wattage Rating in Watts | 1500.0 SINGLE VOLTAGE |
| Terminal Length | 0.638 INCHES NOMINAL IN |
| Mounting Facility Length | 1.812 INCHES NOMINAL IN |
| Element Connection Style | HERMETICALLY SEALED STUD |
| Mounting Method Style | SCREW PLUG OR BUSHING TYPE MOUNTING FACILITY |
| Nominal Thread Size | 0.250 INCHES STUD IN |
| Nominal Thread Size | 0.190 INCHES MOUNTING FACILITY IN |
| Heat Quantity | 1 |
| Nondefinitive Spec/std Data | 3 TYPE |
| Watt Density Rating | 8.4 PER SQUARE INCH SINGLE VOLTAGE |
| Element Radiation Spectrum | NONINFRARED |
| Material | CHROMIUM AND NICKEL RESISTANCE WIRE |
| Material | COPPER AND NICKEL SHEATH |
| Thread Series Designator | UNF STUD |
| Thread Series Designator | UNF MOUNTING FACILITY |
| Thread Quantity | 32.0 PER INCH MOUNTING FACILITY |
| Thread Quantity | 28.0 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 |
| Part Number | Manufacturer |
|---|---|
| 3-43084 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| ASK43084-3 | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| Reference | Meaning |
|---|---|
| MILH22577 | 4/1 Identification reference U.S. Government activity |
NSN 4520-00-918-9974 is a Heating Element,electrical,nonim, manufactured by Chromalox Inc Dba Chromalox Precision Heat and Control, Inc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-00-918-9974 has 2 manufacturer part numbers on file: 3-43084 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), ASK43084-3 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
1 possible match (shared part number, not a government interchangeability claim): 5365-01-105-9196. Verify interchangeability with system specifications before substitution.
Key specifications for 3-43084: Terminal Quantity: 2; Length: 33.125 INCHES MINIMUM AND 33.625 INCHES MAXIMUM IN; Voltage in Volts and Current Type: 254.0 DC SINGLE VOLTAGE; Body Style: TUBULAR, THREADED TERMINALS. 22 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.