The Heating Element,electrical,immer, cataloged under National Stock Number 4520-01-220-6507, 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 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-220-6507 |
| Primary Part Number | 157-117218-163 |
| 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 |
| Phase | THREE SINGLE VOLTAGE |
| Voltage in Volts and Current Type | 480.0 AC SINGLE VOLTAGE |
| Body Style | DEEP TANK, CIRCULAR BLADE, OVER-THE-SIDE TYPE |
| Maximum Wattage Rating in Watts | 12000.0 SINGLE VOLTAGE |
| Element Connection Style | STUD TYPE |
| Riser Height | 48.000 INCHES NOMINAL IN |
| Minimum Clearance Distance | 14.000 INCHES NOMINAL IN |
| Heat Control Type | THERMOCOUPLE |
| Element Radiation Spectrum | NONINFRARED |
| 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 |
|---|---|
| 157-117218-163 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| Reference | Meaning |
|---|---|
| 157-117218-999 | C/1 Advisory reference — outside the item-of-supply concept Chromalox Inc |
| 157-117218-999 | D/9 Drawing number reference only Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
NSN 4520-01-220-6507 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 4520-01-220-6507 has 1 manufacturer part number on file: 157-117218-163 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
1 possible match (shared part number, not a government interchangeability claim): 4520-01-220-6508. Verify interchangeability with system specifications before substitution.
Key specifications for 157-117218-163: Phase: THREE SINGLE VOLTAGE; Voltage in Volts and Current Type: 480.0 AC SINGLE VOLTAGE; Body Style: DEEP TANK, CIRCULAR BLADE, OVER-THE-SIDE TYPE; Maximum Wattage Rating in Watts: 12000.0 SINGLE VOLTAGE. 10 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.