The Heating Element,electrical,immer, cataloged under National Stock Number 4520-01-354-5155, 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 Wellman Thermal Systems Corp. Government technical data includes 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-354-5155 |
| Primary Part Number | MH22F2B1 |
| Item Name | Heating Element,electrical,immer |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Wellman Thermal Systems Corp |
| Status | ACTIVE |
| Phase | SINGLE SINGLE VOLTAGE |
| Frequency in Hertz | 60.0 |
| Terminal Quantity | 1 |
| Length | 12.500 INCHES NOMINAL IN |
| Voltage in Volts and Current Type | 120.0 AC OR 140.0 AC SINGLE VOLTAGE |
| Body Style | TUBULAR, SCREW TYPE |
| Maximum Wattage Rating in Watts | 1000.0 SINGLE VOLTAGE |
| Mounting Facility Length | 1.000 INCHES NOMINAL IN |
| Element Connection Style | STUD TYPE |
| Effective Heating Length | 12.500 INCHES NOMINAL IN |
| Terminal Box Environmental Protection | STANDARD |
| Mounting Method Style | SCREW PLUG OR BUSHING TYPE MOUNTING FACILITY |
| Nominal Thread Size | 1.250 INCHES MOUNTING FACILITY IN |
| Heat Quantity | 1 |
| Watt Density Rating | 22.0 PER SQUARE INCH SINGLE VOLTAGE |
| Element Radiation Spectrum | NONINFRARED |
| Material | STEEL CORROSION RESISTING SHEATH |
| Thread Series Designator | NPT SCREW |
| Thread Quantity | 11.500 PER INCH MOUNTING FACILITY |
| Element Quantity | 2 |
| 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 |
|---|---|
| GS1221-48 | Hamilton Sundstrand Corporation Dba Collins Aerospace (USA) |
| MH22F2B1 PRIMARY | Wellman Thermal Systems Corp (USA) |
| Reference | Meaning |
|---|---|
| GS1221-48 | C/1 Advisory reference — outside the item-of-supply concept Wellman Thermal Systems Corp |
NSN 4520-01-354-5155 is a Heating Element,electrical,immer, manufactured by Wellman Thermal Systems Corp, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-354-5155 has 2 manufacturer part numbers on file: GS1221-48 (Hamilton Sundstrand Corporation Dba Collins Aerospace), MH22F2B1 (Wellman Thermal Systems Corp).
Key specifications for MH22F2B1: Phase: SINGLE SINGLE VOLTAGE; Frequency in Hertz: 60.0; Terminal Quantity: 1; Length: 12.500 INCHES NOMINAL IN. 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.