The Muffler,exhaust, cataloged under National Stock Number 2990-01-033-3041, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Harco Manufacturing Company Div Harco Manufacturing Company Inc. Government technical data includes 22 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 2990-01-033-3041 |
| Primary Part Number | 7530-RS3-SI |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Harco Manufacturing Company Div Harco Manufacturing Company Inc |
| Status | ACTIVE |
| Operating Position | UNIVERSAL |
| Outlet Thread Size | 3-8 FIRST OUTLET |
| Inlet Location | LOCATED IN SIDE OF BODY 2.000 IN. FROM END IN |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 7.500 INCHES NOMINAL IN |
| Outlet Thread Direction | RIGHT-HAND FIRST OUTLET |
| Inlet Thread Location | EXTERNAL SINGLE INLET |
| Inlet Projection Length | 3.000 INCHES NOMINAL SINGLE INLET IN |
| Outlet Thread Series Designator | NPT FIRST OUTLET |
| Muffler Design | MULTIPASS |
| Thread Location | EXTERNAL FIRST OUTLET |
| Inlet Connection Type | THREADED SINGLE INLET |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Body Shape | ROUND |
| Inlet Thread Size | 3-1/2-8 SINGLE INLET |
| Inlet Thread Series Designator | NPT SINGLE INLET |
| Surface Treatment | ALUMINUM ALLOY |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 3.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | THREADED 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 |
|---|---|
| 7530-RS3-SI PRIMARY | Harco Manufacturing Company Div Harco Manufacturing Company Inc (USA) |
| Reference | Meaning |
|---|---|
| 7530-RS3 | 5/9 Secondary reference Harco Manufacturing Company Div Harco Manufacturing Company Inc |
| 1039-10132 | 5/9 Secondary reference Jbf Scientific Corp |
NSN 2990-01-033-3041 is a Muffler,exhaust, manufactured by Harco Manufacturing Company Div Harco Manufacturing Company Inc, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-033-3041 has 1 manufacturer part number on file: 7530-RS3-SI (Harco Manufacturing Company Div Harco Manufacturing Company Inc).
Key specifications for 7530-RS3-SI: Operating Position: UNIVERSAL; Outlet Thread Size: 3-8 FIRST OUTLET; Inlet Location: LOCATED IN SIDE OF BODY 2.000 IN. FROM END IN; Coolant Type: AIR. 22 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.