The Heating Element,electrical,immer, cataloged under National Stock Number 4520-01-139-1895, 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 21 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-139-1895 |
| Primary Part Number | TM0-309B |
| 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 |
| Flange Diameter | 7.500 INCHES NOMINAL IN |
| Phase | THREE SINGLE VOLTAGE |
| Frequency in Hertz | 60.0 |
| Terminal Quantity | 6 |
| Length | 48.250 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 240.0 AC OR 480.0 AC SINGLE VOLTAGE |
| Body Style | FLANGE, TYPE |
| Hole or Slot Quantity | 4 |
| Flange Thickness | 0.938 INCHES NOMINAL IN |
| Maximum Wattage Rating in Watts | 9000.0 SINGLE VOLTAGE |
| Element Connection Style | TERMINAL SCREW |
| Effective Heating Length | 2.750 INCHES NOMINAL IN |
| Mounting Method Style | FLANGE TYPE MOUNTING FACILITY |
| Heat Quantity | 1 |
| Watt Density Rating | 22.0 PER SQUARE INCH SINGLE VOLTAGE |
| Bolt Circle Diameter | 6.000 INCHES NOMINAL IN |
| Conduit Opening Size | 1.000 INCHES NOMINAL IN |
| Element Radiation Spectrum | NONINFRARED |
| Material | STEEL SHEATH |
| Hole Diameter | 0.750 INCHES NOMINAL IN |
| 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 |
|---|---|
| TM0-309B PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| Reference | Meaning |
|---|---|
| TM0-309B | 5/9 Secondary reference Chromalox, Inc. Div Chromalox |
NSN 4520-01-139-1895 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 4520-01-139-1895 has 1 manufacturer part number on file: TM0-309B (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
Key specifications for TM0-309B: Flange Diameter: 7.500 INCHES NOMINAL IN; Phase: THREE SINGLE VOLTAGE; Frequency in Hertz: 60.0; Terminal Quantity: 6. 21 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.