The Muffler,exhaust, cataloged under National Stock Number 2990-00-042-4501, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Clinton Engines Corp. Government technical data includes 16 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-042-4501 |
| Primary Part Number | 170-0136-50 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Clinton Engines Corp |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Location | CENTRALLY LOCATED IN END SECTION |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 1.750 INCHES NOMINAL IN |
| Inlet Thread Location | EXTERNAL SINGLE INLET |
| Inlet Projection Length | 0.880 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 1 |
| Muffler Design | BAFFLE |
| Tube Quantity | 1 |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Nonconnection Outlet Location | CENTRALLY LOCATED IN END SECTION OPPOSITE INLET |
| Nonconnection Outlet Type and Quantity | 1 ROUND HOLE |
| Inlet Thread Size | 1/2-14 SINGLE INLET |
| Nonconnection Outlet Size | 0.625 IN. DIA IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| 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 |
|---|---|
| 170-0136-50 PRIMARY | Clinton Engines Corp (USA) |
| Reference | Meaning |
|---|---|
| 170-136-500 | 5/9 Secondary reference Clinton Engines Corp |
| 170-159-500 | 5/9 Secondary reference Clinton Engines Corp |
| 170136500 | 5/9 Secondary reference Clinton Engines Corp |
NSN 2990-00-042-4501 is a Muffler,exhaust, manufactured by Clinton Engines Corp, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-042-4501 has 1 manufacturer part number on file: 170-0136-50 (Clinton Engines Corp).
Key specifications for 170-0136-50: Operating Position: HORIZONTAL; Inlet Location: CENTRALLY LOCATED IN END SECTION; Coolant Type: AIR; Design Type: DRY. 16 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.