The Heating Element,electrical,immer, cataloged under National Stock Number 4520-01-178-5678, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-178-5678 |
| Primary Part Number | 156-500543-011 |
| 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 |
| Frequency in Hertz | 60.0 |
| Length | 30.000 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 440.0 AC SINGLE VOLTAGE |
| Maximum Wattage Rating in Watts | 2000.0 SINGLE VOLTAGE |
| Outside Diameter | 0.312 INCHES NOMINAL IN |
| Nominal Thread Size | 0.750 INCHES STUD IN |
| Material | STEEL CORROSION RESISTING SHEATH |
| Thread Series Designator | NPT STUD |
| Thread Quantity | 14.0 PER INCH STUD |
| 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 |
|---|---|
| 156-500543-011 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| 025-20800 | Johnson Controls Navy Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| 65S-1002-001 | 5/9 Secondary reference Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| 025-19987B | C/1 Advisory reference — outside the item-of-supply concept Johnson Controls Navy Systems, Llc |
| 156-500543-001 | 5/9 Secondary reference Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
NSN 4520-01-178-5678 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 4520-01-178-5678 has 2 manufacturer part numbers on file: 156-500543-011 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), 025-20800 (Johnson Controls Navy Systems, Llc).
Key specifications for 156-500543-011: Frequency in Hertz: 60.0; Length: 30.000 INCHES NOMINAL IN; Voltage in Volts and Current Type: 440.0 AC SINGLE VOLTAGE; Maximum Wattage Rating in Watts: 2000.0 SINGLE VOLTAGE. 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.