The Heat Sink,electrical-Electronic, cataloged under National Stock Number 5999-01-342-8879, 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 Transistor Devices Inc Div Astrodyne Tdi High Power Business Unit. Government technical data includes 6 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. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5999-01-342-8879 |
| Primary Part Number | 27656-1 |
| Item Name | Heat Sink,electrical-Electronic |
| FSC / FSG | 5999 / 59 — Miscellaneous Electrical and Electronic Components |
| Manufacturer | Transistor Devices Inc Div Astrodyne Tdi High Power Business Unit |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 7 UNTHREADED HOLE(S) SECOND MOUNTING FACILITY |
| Mounting Facility Type and Quantity | 16 UNTHREADED HOLE(S) FIRST MOUNTING FACILITY |
| Body Style | CLIP PRESS-ON |
| Unthreaded Mounting Hole Diameter | 0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM FIRST MOUNTING FACILITY IN |
| Unthreaded Mounting Hole Diameter | 0.279 INCHES MINIMUM AND 0.283 INCHES MAXIMUM SECOND MOUNTING FACILITY IN |
| Material | ALUMINUM |
| 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 | JN |
| Part Number | Manufacturer |
|---|---|
| 27656-1 PRIMARY | Transistor Devices Inc Div Astrodyne Tdi High Power Business Unit (USA) |
NSN 5999-01-342-8879 is a Heat Sink,electrical-Electronic, manufactured by Transistor Devices Inc Div Astrodyne Tdi High Power Business Unit, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
NSN 5999-01-342-8879 has 1 manufacturer part number on file: 27656-1 (Transistor Devices Inc Div Astrodyne Tdi High Power Business Unit).
Key specifications for 27656-1: Mounting Facility Type and Quantity: 7 UNTHREADED HOLE(S) SECOND MOUNTING FACILITY; Mounting Facility Type and Quantity: 16 UNTHREADED HOLE(S) FIRST MOUNTING FACILITY; Overall Height: 42.000 INCHES NOMINAL IN; Body Style: CLIP PRESS-ON. 6 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.