The Heat Sink,electrical-Electronic, cataloged under National Stock Number 5999-01-157-0691, is classified within Federal Supply Class 5999 (Miscellaneous Electrical and Electronic Components) of the Electrical and Electronic Equipment Components group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5999-01-157-0691 |
| Item Name | Heat Sink,electrical-Electronic |
| FSC / FSG | 5999 / 59 — Miscellaneous Electrical and Electronic Components |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 3 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY |
| Overall Diameter | 0.220 INCHES NOMINAL IN |
| Unthreaded Mounting Hole Diameter | 0.040 INCHES NOMINAL SINGLE MOUNTING FACILITY IN |
| Material | BERYLLIUM OXIDE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 177-18-30 | 5/9 Secondary reference Eg and G Wakefield Engineering |
| 149027-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5999-01-157-0691 is a Heat Sink,electrical-Electronic, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5340-01-555-3488. Verify interchangeability with system specifications before substitution.
Key specifications for 5999-01-157-0691: Mounting Facility Type and Quantity: 3 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY; Overall Height: 0.030 INCHES NOMINAL IN; Overall Diameter: 0.220 INCHES NOMINAL IN; Unthreaded Mounting Hole Diameter: 0.040 INCHES NOMINAL SINGLE MOUNTING FACILITY IN. 4 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.