The Muffler,exhaust, cataloged under National Stock Number 2990-01-138-6746, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Mosier Fluid Power of Ohio Inc Dba Kc Mosier Co. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-138-6746 |
| Primary Part Number | EM10 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Mosier Fluid Power of Ohio Inc Dba Kc Mosier Co |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 3.875 INCHES NOMINAL IN |
| Inlet Thread Location | EXTERNAL SINGLE INLET |
| Muffler Design | STRAIGHT THROUGH |
| Inlet Connection Type | THREADED SINGLE INLET |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Body Shape | ROUND |
| Inlet Thread Size | 1-1/4 SINGLE INLET |
| Inlet Thread Series Designator | NPT SINGLE INLET |
| Material | COPPER ALLOY OR STEEL CORROSION RESISTING 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 |
|---|---|
| EM10 PRIMARY | Mosier Fluid Power of Ohio Inc Dba Kc Mosier Co (USA) |
| Reference | Meaning |
|---|---|
| EP TYPE4-44 M10 | 5/9 Secondary reference U.S. Government activity |
| 0111010 M10 | 3/2 Design control — primary reference U.S. Government activity |
NSN 2990-01-138-6746 is a Muffler,exhaust, manufactured by Mosier Fluid Power of Ohio Inc Dba Kc Mosier Co, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-138-6746 has 1 manufacturer part number on file: EM10 (Mosier Fluid Power of Ohio Inc Dba Kc Mosier Co).
3 possible matches (shared part number, not a government interchangeability claim): 6625-01-320-8360, 6515-01-389-8410, 6530-01-470-2390. Verify interchangeability with system specifications before substitution.
Key specifications for EM10: Operating Position: HORIZONTAL; Inlet Location: CENTRALLY LOCATED IN END SECTION OF BODY; Coolant Type: AIR; Design Type: DRY. 13 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.