The Heater Assembly, cataloged under National Stock Number 4520-01-017-6787, 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 Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4520-01-017-6787 |
| Primary Part Number | 687394-0001 |
| Item Name | Heater Assembly |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
| Status | ACTIVE |
| General Characteristics Item Description | MATERIAL 6061-T4 ALUMINUM SHEET,0.062 IN.THICK PER FED SPEC QQ-A-250/11. CHROMATE CONVERSION COAT PER MIL-C-5541,CLASS 1A. HEATER ASSEMBLY CONSISTS OF 1 EA PLATE,P/N 687394-99,HEATER,P/N 683191 AND THERMISTOR. HEATER ASSEMBLY 2.00 IN. LG,1.20 IN. WIDE AND 0.062 @IN. THK A |
| 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 |
|---|---|
| 687394-0001 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA) |
| Reference | Meaning |
|---|---|
| 687394-1 | 5/9 Secondary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
NSN 4520-01-017-6787 is a Heater Assembly, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-017-6787 has 1 manufacturer part number on file: 687394-0001 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp).
1 possible match (shared part number, not a government interchangeability claim): 5360-01-346-1216. Verify interchangeability with system specifications before substitution.
Key specifications for 687394-0001: General Characteristics Item Description: MATERIAL 6061-T4 ALUMINUM SHEET,0.062 IN.THICK PER FED SPEC QQ-A-250/11. CHROMATE CONVERSION COAT PER MIL-C-5541,CLASS 1A. HEATER ASSEMBLY CONSISTS OF 1 EA PLATE,P/N 687394-99,HEATER,P/N 683191 AND THERMISTOR. HEATER ASSEMBLY 2.00 IN. LG,1.20 IN. WIDE AND 0.062 @IN. THK A. 1 specification is 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.