The Heat Shield,exhaust, cataloged under National Stock Number 2990-01-674-8270, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is General Motors Corp. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 2990-01-674-8270 |
| Primary Part Number | 12638439 |
| Item Name | Heat Shield,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | General Motors Corp |
| Status | ACTIVE |
| Mounting Method | UNTHREADED MOUNTING HOLES |
| Material | STEEL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 12638439 PRIMARY | General Motors Corp (USA) |
| Reference | Meaning |
|---|---|
| 4373424 | 7/2 Vendor item drawing reference Oshkosh Defense Llc |
NSN 2990-01-674-8270 is a Heat Shield,exhaust, manufactured by General Motors Corp, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-674-8270 has 1 manufacturer part number on file: 12638439 (General Motors Corp).
Key specifications for 12638439: Overall Height: 2.04 INCHES NOMINAL IN; Mounting Method: UNTHREADED MOUNTING HOLES; Overall Length: 8.13 INCHES NOMINAL IN; Overall Width: 6.40 INCHES NOMINAL IN. 2 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.