The Heating Element,electrical,immer, cataloged under National Stock Number 4520-00-994-4394, 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 Indeeco Llc Dba Indeeco. Government technical data includes 27 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4520-00-994-4394 |
| Primary Part Number | A9221 |
| Item Name | Heating Element,electrical,immer |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Indeeco Llc Dba Indeeco |
| Status | ACTIVE |
| Flange Diameter | 10.000 INCHES NOMINAL IN |
| Phase | THREE SINGLE VOLTAGE |
| Frequency in Hertz | 60.0 |
| Terminal Quantity | 12 |
| Length | 33.000 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 | 0.938 INCHES NOMINAL IN |
| Maximum Wattage Rating in Watts | 12000.0 SINGLE VOLTAGE |
| Terminal Length | 0.625 INCHES NOMINAL IN |
| Element Connection Style | STUD TYPE |
| Terminal Box Environmental Protection | MOISTURE RESISTANT |
| Mounting Method Style | FLANGE TYPE MOUNTING FACILITY |
| Nominal Thread Size | 0.190 INCHES STUD IN |
| Heat Quantity | 1 |
| Watt Density Rating | 22.0 PER SQUARE INCH SINGLE VOLTAGE |
| Bolt Circle Diameter | 8.500 INCHES NOMINAL IN |
| Conduit Opening Size | 1.000 INCHES NOMINAL IN |
| Element Radiation Spectrum | NONINFRARED |
| Material | NICKEL ALLOY RESISTANCE WIRE |
| Material | STEEL SHEATH |
| Material | MAGNESIUM RESISTANCE WIRE EMBEDDING/SUPPORT INSULATION |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) STUD |
| Thread Quantity | 32.0 PER INCH STUD |
| Hole Diameter | 0.875 INCHES NOMINAL IN |
| Element Quantity | 6 |
| 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 |
|---|---|
| A9221 | Indeeco Llc Dba Indeeco (USA) |
| 43PT533AL | Indeeco Llc Dba Indeeco (USA) |
| Reference | Meaning |
|---|---|
| A9221 | 3/9 Design control — primary reference Hollingsworth John R Co |
| 43PT533AL | 5/9 Secondary reference Hollingsworth John R Co |
| 43PT533A-L | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 4520-00-994-4394 is a Heating Element,electrical,immer, manufactured by Indeeco Llc Dba Indeeco, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-00-994-4394 has 2 manufacturer part numbers on file: A9221 (Indeeco Llc Dba Indeeco), 43PT533AL (Indeeco Llc Dba Indeeco).
Key specifications for A9221: Flange Diameter: 10.000 INCHES NOMINAL IN; Phase: THREE SINGLE VOLTAGE; Frequency in Hertz: 60.0; Terminal Quantity: 12. 27 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.