The Heating Element,electrical,nonim, cataloged under National Stock Number 4520-01-261-6557, 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 Thermal Circuits, Inc. Dba Thermal Circuits Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4520-01-261-6557 |
| Primary Part Number | TF8921 |
| Item Name | Heating Element,electrical,nonim |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Thermal Circuits, Inc. Dba Thermal Circuits Inc |
| Status | ACTIVE |
| Phase | SINGLE SINGLE VOLTAGE |
| Frequency in Hertz | 400.0 |
| Terminal Quantity | 2 |
| Voltage in Volts and Current Type | 113.0 AC SINGLE VOLTAGE |
| Body Style | ODD/IRREGULAR SHAPED ITEMS |
| Maximum Wattage Rating in Watts | 18.0 SINGLE VOLTAGE |
| Terminal Length | 6.000 INCHES MINIMUM IN |
| Element Connection Style | WIRE LEAD |
| Material Document and Classification | MIL-I-18746 MIL SPEC SINGLE MATERIAL RESPONSE RESISTANCE WIRE EMBEDDING/SUPPORT INSULATION |
| Material Document and Classification | MIL-N-6840 MIL SPEC SINGLE MATERIAL RESPONSE SHEATH |
| Heat Quantity | 1 |
| Element Radiation Spectrum | NONINFRARED |
| Width | 1.650 INCHES NOMINAL IN |
| Material | NICKEL AND CHROMIUM AND IRON SHEATH |
| Material | GLASS FIBER AND PLASTIC POLYTETRAFLUOROETHYLENE RESISTANCE WIRE EMBEDDING/SUPPORT INSULATION |
| Element Quantity | 1 |
| 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 |
|---|---|
| TF8921 PRIMARY | Thermal Circuits, Inc. Dba Thermal Circuits Inc (USA) |
| Reference | Meaning |
|---|---|
| 917AS6827 | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
NSN 4520-01-261-6557 is a Heating Element,electrical,nonim, manufactured by Thermal Circuits, Inc. Dba Thermal Circuits Inc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-261-6557 has 1 manufacturer part number on file: TF8921 (Thermal Circuits, Inc. Dba Thermal Circuits Inc).
Key specifications for TF8921: Phase: SINGLE SINGLE VOLTAGE; Frequency in Hertz: 400.0; Terminal Quantity: 2; Voltage in Volts and Current Type: 113.0 AC SINGLE VOLTAGE. 16 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.