The Heating Element,electrical,immer, cataloged under National Stock Number 4520-01-186-2218, 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. Government technical data includes 20 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-186-2218 |
| Primary Part Number | 155-071172-117 |
| Item Name | Heating Element,electrical,immer |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Chromalox Inc |
| Status | ACTIVE |
| Flange Diameter | 11.040 INCHES NOMINAL IN |
| Phase | THREE SINGLE VOLTAGE |
| Frequency in Hertz | 60.0 |
| Terminal Quantity | 24 |
| Length | 28.000 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 440.0 AC SINGLE VOLTAGE |
| Body Style | FLANGE, TYPE |
| Hole or Slot Quantity | 8 |
| Flange Thickness | 1.000 INCHES NOMINAL IN |
| Maximum Wattage Rating in Watts | 1200.0 SINGLE VOLTAGE |
| Element Connection Style | STUD TYPE |
| Effective Heating Length | 16.000 INCHES NOMINAL IN |
| Mounting Method Style | FLANGE TYPE MOUNTING FACILITY |
| Heat Quantity | 1 |
| Bolt Circle Diameter | 9.500 INCHES NOMINAL IN |
| Conduit Opening Size | 1.500 INCHES NOMINAL IN |
| Element Radiation Spectrum | NONINFRARED |
| Material | STEEL SHEATH |
| Hole Diameter | 0.875 INCHES NOMINAL IN |
| Element Quantity | 12 |
| 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 |
|---|---|
| 155-071172-117 PRIMARY | Chromalox Inc (USA) |
| Reference | Meaning |
|---|---|
| TMSS-1218VE4X | 5/9 Secondary reference Chromalox Inc |
| 155-071172-999 | 5/9 Secondary reference Chromalox Inc |
NSN 4520-01-186-2218 is a Heating Element,electrical,immer, manufactured by Chromalox Inc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-186-2218 has 1 manufacturer part number on file: 155-071172-117 (Chromalox Inc).
Key specifications for 155-071172-117: Flange Diameter: 11.040 INCHES NOMINAL IN; Phase: THREE SINGLE VOLTAGE; Frequency in Hertz: 60.0; Terminal Quantity: 24. 20 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.