The Muffler,exhaust-Intake, cataloged under National Stock Number 2990-00-797-4633, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 27 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-797-4633 |
| Item Name | Muffler,exhaust-Intake |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Inlet Flange Shape | OVAL SINGLE INLET |
| Inlet Flange Shape | OVAL FIRST OUTLET |
| Operating Position | VERTICAL |
| Inlet Outside Diameter | 0.875 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Outside Diameter | 0.875 INCHES NOMINAL SINGLE INLET IN |
| Outlet Connection Quantity | 1 |
| Inlet Location | LOCATED IN FLAT SIDE OF BODY IN-LINE |
| Outlet Flange Mounting Provision and Quantity | 2 HOLES LOCATION NOT OTHERWISE SPECIFIED |
| Inlet Connection Quantity | 2 |
| Outlet Inside Diameter | 0.810 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Inlet Projection Length | 2.719 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Projection Length | 2.719 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 1 |
| Material Document and Classification | MIL-S-4174 MIL SPEC 1ST MATERIAL RESPONSE AND SAE 1010 ASSN STD 2ND MATERIAL RESPONSE AND SAE 1020 ASSN STD 3RD MATERIAL RESPONSE |
| Inlet Flange Mounting Hole Diameter | 0.281 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Flange Mounting Hole Diameter | 0.281 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | BAFFLE |
| Outlet Outside Diameter | 0.875 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Outlet Flange Shape | OVAL LOCATION NOT OTHERWISE SPECIFIED |
| Inlet Connection Type | FLANGE SINGLE INLET |
| Inlet Connection Type | FLANGE FIRST OUTLET |
| Body Shape | RECTANGULAR |
| Inlet Flange Mounting Provision and Quantity | 2 HOLES SINGLE INLET |
| Inlet Flange Mounting Provision and Quantity | 2 HOLES FIRST OUTLET |
| Outlet Flange Mounting Hole Diameter | 0.281 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Inlet Inside Diameter | 0.810 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Inside Diameter | 0.810 INCHES NOMINAL SINGLE INLET IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 2990007974633 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 9787E23 | 3/2 Design control — primary reference U.S. Government activity |
| ERE5420 | 5/9 Secondary reference Renk America Llc Div Renk America |
NSN 2990-00-797-4633 is a Muffler,exhaust-Intake, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-00-797-4633: Inlet Flange Shape: OVAL SINGLE INLET; Inlet Flange Shape: OVAL FIRST OUTLET; Operating Position: VERTICAL; Overall Height: 1.510 INCHES NOMINAL IN. 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.