The Muffler,exhaust, cataloged under National Stock Number 2990-00-722-5116, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 2990-00-722-5116 |
| Primary Part Number | 8S6443 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Operating Position | UNIVERSAL |
| Inlet Outside Diameter | 6.151 INCHES MINIMUM AND 6.161 INCHES MAXIMUM SINGLE INLET IN |
| Inlet Location | 3.590 IN. C TO C FROM HORIZONTAL CENTER LINE IN |
| Coolant Type | AIR |
| Design Type | DRY |
| Outlet Inside Diameter | 6.023 INCHES MINIMUM AND 6.033 INCHES MAXIMUM FIRST OUTLET IN |
| Inlet Projection Length | 2.500 INCHES MINIMUM AND 2.620 INCHES MAXIMUM SINGLE INLET IN |
| Baffle Quantity | 1 |
| Muffler Design | MULTIPASS |
| Outlet Outside Diameter | 6.151 INCHES MINIMUM AND 6.161 INCHES MAXIMUM FIRST OUTLET IN |
| Tube Quantity | 2 |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | OVAL |
| Surface Treatment | ALUMINUM ALLOY |
| Inlet Inside Diameter | 6.023 INCHES MINIMUM AND 6.033 INCHES MAXIMUM SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 8.940 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | 3.590 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 |
|---|---|
| 8S6443 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| IPD8S6443 | 5/9 Secondary reference Industrial Parts Depot, Llc Dba Ipd |
| M0M12-0123 | 5/9 Secondary reference Donaldson Company, Inc. |
NSN 2990-00-722-5116 is a Muffler,exhaust, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-722-5116 has 1 manufacturer part number on file: 8S6443 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 8S6443: Operating Position: UNIVERSAL; Overall Height: 14.880 INCHES MINIMUM AND 15.120 INCHES MAXIMUM IN; Inlet Outside Diameter: 6.151 INCHES MINIMUM AND 6.161 INCHES MAXIMUM SINGLE INLET IN; Inlet Location: 3.590 IN. C TO C FROM HORIZONTAL CENTER LINE IN. 19 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.