The Heat Sink,electrical-Electronic, cataloged under National Stock Number 5999-01-346-8607, is classified within Federal Supply Class 5999 (Miscellaneous Electrical and Electronic Components) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5999-01-346-8607 |
| Primary Part Number | 8478A25H01 |
| Item Name | Heat Sink,electrical-Electronic |
| FSC / FSG | 5999 / 59 — Miscellaneous Electrical and Electronic Components |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 2 UNTHREADED HOLE(S) SECOND MOUNTING FACILITY |
| Mounting Facility Type and Quantity | 2 UNTHREADED HOLE(S) FIRST MOUNTING FACILITY |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE II,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE |
| Body Style | EXTRUDED |
| Unthreaded Mounting Hole Diameter | 0.185 INCHES MINIMUM AND 0.195 INCHES MAXIMUM FIRST MOUNTING FACILITY IN |
| Unthreaded Mounting Hole Diameter | 0.215 INCHES MINIMUM AND 0.225 INCHES MAXIMUM SECOND MOUNTING FACILITY IN |
| Material Document and Classification | QQ-A-200/9,ALLOY 6063-T5 FED SPEC SINGLE MATERIAL RESPONSE |
| Surface Treatment | ANODIZE |
| Material | ALUMINUM ALLOY 6063 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Shelf Life Code | 0 |
| Criticality Code | X |
| Unit of Issue | EA |
| Acquisition advice code | J |
| Weight | 0.5300 lbs |
| Cube | 0.0190 cu ft |
| Part Number | Manufacturer |
|---|---|
| 8478A25H01 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA) |
| Reference | Meaning |
|---|---|
| 403-AA WITH 103 INSULATORS | 5/9 Secondary reference Eg and G Wakefield Engineering |
NSN 5999-01-346-8607 is a Heat Sink,electrical-Electronic, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
NSN 5999-01-346-8607 has 1 manufacturer part number on file: 8478A25H01 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp).
Key specifications for 8478A25H01: Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S) SECOND MOUNTING FACILITY; Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S) FIRST MOUNTING FACILITY; Overall Height: 1.235 INCHES MINIMUM AND 1.265 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-A-8625,TYPE II,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE. 9 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.