The Heating Element,electrical,immer, cataloged under National Stock Number 4520-00-979-7491, 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 Watlow Electric Manufacturing Co Dba Watlow. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-00-979-7491 |
| Primary Part Number | A6-39-19 |
| Item Name | Heating Element,electrical,immer |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Watlow Electric Manufacturing Co Dba Watlow |
| Status | ACTIVE |
| Phase | THREE SINGLE VOLTAGE |
| Terminal Quantity | 6 |
| Length | 21.125 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 208.0 AC SINGLE VOLTAGE |
| Body Style | TUBULAR, SCREW TYPE |
| Maximum Wattage Rating in Watts | 13500.0 SINGLE VOLTAGE |
| Terminal Length | 0.813 INCHES NOMINAL IN |
| Mounting Facility Length | 1.250 INCHES NOMINAL IN |
| Element Connection Style | STUD TYPE |
| Effective Heating Length | 20.187 INCHES NOMINAL IN |
| Mounting Method Style | SCREW PLUG OR BUSHING TYPE MOUNTING FACILITY |
| Nominal Thread Size | 2.500 INCHES MOUNTING FACILITY IN |
| Heat Quantity | 3 |
| Watt Density Rating | 74.2 PER SQUARE INCH SINGLE VOLTAGE |
| Element Radiation Spectrum | NONINFRARED |
| Material | STEEL CORROSION RESISTING SHEATH |
| Thread Series Designator | NPT MOUNTING FACILITY |
| Thread Quantity | 8.0 PER INCH MOUNTING FACILITY |
| 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 |
|---|---|
| A6-39-19 PRIMARY | Watlow Electric Manufacturing Co Dba Watlow (USA) |
| 156-110112-004 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| MWN99HB6B000 PRIMARY | Wellman-Teton Corp (USA) |
| Reference | Meaning |
|---|---|
| 321-13-5SS9000 | 5/9 Secondary reference Blickman Casework and Design Corp |
| 4X-17684AX | 5/9 Secondary reference Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| SK-110112 | 5/9 Secondary reference Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| MTS3X449 | 5/9 Secondary reference Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
NSN 4520-00-979-7491 is a Heating Element,electrical,immer, manufactured by Watlow Electric Manufacturing Co Dba Watlow, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-00-979-7491 has 3 manufacturer part numbers on file: A6-39-19 (Watlow Electric Manufacturing Co Dba Watlow), 156-110112-004 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), MWN99HB6B000 (Wellman-Teton Corp).
Key specifications for A6-39-19: Phase: THREE SINGLE VOLTAGE; Terminal Quantity: 6; Length: 21.125 INCHES NOMINAL IN; Voltage in Volts and Current Type: 208.0 AC SINGLE VOLTAGE. 19 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.