The Heat Sink-Insulator, cataloged under National Stock Number 5999-01-423-7690, 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 U S Army Tank Automotive Command Amsta-Im-Mm. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5999-01-423-7690 |
| Primary Part Number | 12373800 |
| Item Name | Heat Sink-Insulator |
| FSC / FSG | 5999 / 59 — Miscellaneous Electrical and Electronic Components |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 8 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY |
| Unthreaded Mounting Hole Diameter | 0.278 INCHES MINIMUM AND 0.292 INCHES MAXIMUM SINGLE MOUNTING FACILITY IN |
| Material | GLASS AND RUBBER SILICONE CLASS Q |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 12373800 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 12373800 | 5/9 Secondary reference General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems |
| 12373800 | C/1 Advisory reference — outside the item-of-supply concept General Dynamics Land Systems Customer Service & Support Company Div General Dynamics Land Systems Inc |
NSN 5999-01-423-7690 is a Heat Sink-Insulator, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
NSN 5999-01-423-7690 has 1 manufacturer part number on file: 12373800 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12373800: Mounting Facility Type and Quantity: 8 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY; Unthreaded Mounting Hole Diameter: 0.278 INCHES MINIMUM AND 0.292 INCHES MAXIMUM SINGLE MOUNTING FACILITY IN; Overall Length: 11.790 INCHES MINIMUM AND 11.790 INCHES MINIMUM AND 11.910 INCHES MAXIMUM11.910 INCHES MAXIMUM IN; Overall Width: 11.290 INCHES MINIMUM AND 11.290 INCHES MINIMUM AND 11.410 INCHES MAXIMUM11.410 INCHES MAXIMUM IN. 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.