The Muffler,exhaust, cataloged under National Stock Number 2990-00-656-7453, 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 27 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 | 2990-00-656-7453 |
| Primary Part Number | 6567453 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Inlet Flange Shape | OVAL SINGLE INLET |
| Operating Position | HORIZONTAL |
| FSC Application Data | EXHAUST SYSTEM ENGINE,NON-AIRCRAFT |
| Inlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| Coolant Type | AIR |
| Outlet Flange Mounting Provision and Quantity | 2 HOLES FIRST OUTLET |
| Inlet Flange Mounting Provision Thread Direction | RIGHT-HAND SINGLE INLET |
| Design Type | DRY |
| Overall Diameter | 4.500 INCHES NOMINAL IN |
| Center to Center Distance Between Mounting Holes | 3-3/8 IN. DIA BOLT CIRCLE SINGLE INLET IN |
| Inlet Projection Length | 0.375 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 4 |
| Muffler Design | BAFFLE |
| Outlet Flange Shape | OVAL FIRST OUTLET |
| Tube Quantity | 3 |
| Inlet Connection Type | FLANGE SINGLE INLET |
| Body Shape | OVAL |
| Inlet Flange Mounting Provision and Quantity | 2 STUDS SINGLE INLET |
| Thread Size | 7/16-14 SINGLE INLET FLANGE MOUNTING PROVISION |
| Surface Treatment | ZINC |
| Outlet Flange Mounting Hole Diameter | 0.469 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Flange Mounting Stud Length | 1.000 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 6.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Flange Mounting Provision Spacing | 3-3/8 IN. DIA BOLT CIRCLE IN |
| Outlet Connection Type | FLANGE FIRST OUTLET |
| Outlet Location | LOCATED 2-3/4 IN.C TO C FROM HORIZONTAL CENTER LINE IN |
| 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 |
|---|---|
| 6567453 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 2990-00-656-7453 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 2990-00-656-7453 has 1 manufacturer part number on file: 6567453 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 6567453: Inlet Flange Shape: OVAL SINGLE INLET; Operating Position: HORIZONTAL; Overall Height: 8.250 INCHES NOMINAL IN; FSC Application Data: EXHAUST SYSTEM ENGINE,NON-AIRCRAFT. 27 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.