The Muffler,exhaust, cataloged under National Stock Number 2990-00-620-6823, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 20 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.
| Parameter | Value |
|---|---|
| NSN | 2990-00-620-6823 |
| Primary Part Number | 7996422 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Operating Position | VERTICAL OR HORIZONTAL |
| FSC Application Data | ENGINE,NONAIRCRAFT |
| Inlet Outside Diameter | 5.000 INCHES NOMINAL SINGLE INLET IN |
| Inlet Location | LOCATED 15-15/16 IN. FROM END ON FLAT SIDE OF OVAL ABOVE MTG BRACKETS IN |
| Coolant Type | AIR |
| Design Type | DRY |
| Outlet Inside Diameter | 4.500 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Projection Length | 0.750 INCHES NOMINAL SINGLE INLET IN |
| Material Document and Classification | QQ-S-766, CLASS 7 FED SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Muffler Design | STRAIGHT THROUGH |
| Outlet Outside Diameter | 4.688 INCHES NOMINAL FIRST OUTLET IN |
| Tube Quantity | 2 |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | OVAL |
| Surface Treatment | ALUMINUM |
| Inlet Inside Diameter | 4.000 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL COMP 430 LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 15.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| 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 |
|---|---|
| 7996422 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 2990-00-620-6823 is a Muffler,exhaust, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-620-6823 has 1 manufacturer part number on file: 7996422 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7996422: Operating Position: VERTICAL OR HORIZONTAL; Overall Height: 7.000 INCHES MAXIMUM IN; FSC Application Data: ENGINE,NONAIRCRAFT; Inlet Outside Diameter: 5.000 INCHES NOMINAL SINGLE INLET IN. 20 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.