The Heating Element,electrical,immer, cataloged under National Stock Number 4520-01-520-7421, 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 9 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-520-7421 |
| Primary Part Number | 189229 |
| 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 FIRST VOLTAGE |
| Length | 32.250 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 480.0 AC FIRST VOLTAGE |
| Body Style | SCREW TYPE |
| Watt Density Rating | 46.0 PER SQUARE INCH OR 53.0 PER SQUARE INCH FIRST VOLTAGE |
| Conduit Opening Size | 0.750 INCHES NOMINAL IN |
| Element Radiation Spectrum | NONINFRARED |
| Material | NICKEL ALLOY SHEATH |
| 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 |
|---|---|
| 156-500531-502 | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| 189229 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
NSN 4520-01-520-7421 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 4520-01-520-7421 has 2 manufacturer part numbers on file: 156-500531-502 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), 189229 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
Key specifications for 189229: Phase: THREE FIRST VOLTAGE; Length: 32.250 INCHES NOMINAL IN; Voltage in Volts and Current Type: 480.0 AC FIRST VOLTAGE; Body Style: SCREW TYPE. 9 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.