The Heat Sink-Insulator, cataloged under National Stock Number 5999-01-417-2079, 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 Materion Brush Inc. Government technical data includes 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5999-01-417-2079 |
| Primary Part Number | BBTO-5F |
| Item Name | Heat Sink-Insulator |
| FSC / FSG | 5999 / 59 — Miscellaneous Electrical and Electronic Components |
| Manufacturer | Materion Brush Inc |
| Status | ACTIVE |
| Body Style | CYLINDRICAL |
| Overall Diameter | 0.562 INCHES NOMINAL IN |
| Material | BERYLLIUM OXIDE |
| 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 |
|---|---|
| BBTO-5F | Materion Brush Inc (USA) |
| Reference | Meaning |
|---|---|
| 860804-0001 | 3/9 Design control — primary reference Litton Systems Inc. Div Navigation Systems Division |
| 860804-0001 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
| 860804-1 | 5/9 Secondary reference Litton Systems Inc. Div Navigation Systems Division |
NSN 5999-01-417-2079 is a Heat Sink-Insulator, manufactured by Materion Brush Inc, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
NSN 5999-01-417-2079 has 1 manufacturer part number on file: BBTO-5F (Materion Brush Inc).
Key specifications for BBTO-5F: Overall Height: 0.180 INCHES NOMINAL IN; Body Style: CYLINDRICAL; Overall Diameter: 0.562 INCHES NOMINAL IN; Material: BERYLLIUM OXIDE. 3 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.