The Muffler,exhaust, cataloged under National Stock Number 2990-00-141-9210, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 23 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 2990-00-141-9210 |
| Primary Part Number | PC630S6100-420654 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Location | LOCATED 2-1/4 IN. C TO C FROM HORIZONTAL CENTER LINE IN |
| Coolant Type | WATER |
| Design Type | WET |
| Overall Diameter | 11.500 INCHES NOMINAL IN |
| Center to Center Distance Between Mounting Holes | 5-1/2 IN. DIA BOLT CIRCLE SINGLE INLET IN |
| Water Inlet Thread Size | 1-11-1/2 |
| Inlet Projection Length | 3.000 INCHES NOMINAL SINGLE INLET IN |
| Water Inlet Thread Series Designator | NPT |
| Baffle Quantity | 2 |
| Water Inlet Thread Location | INTERNAL |
| Inlet Flange Mounting Hole Diameter | 0.750 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | DIRECTIONAL VANE |
| Tube Quantity | 3 |
| Departure From Cited Designator | ACQW,ARNJ,ARNK,ARNL,ARNM,ARNN,ARNT,ARTF,ARTH,ARTJ,ARTK,ARTL,ARTM,ARTN,ARTT,ARWC,ARWE,ARWF,ARWG,ARWY,ARWZ,ARXA,ARXB |
| Water Inlet Projection Length | 1.000 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | B TYPE |
| Outlet Flange Mounting Hole Diameter | 0.750 INCHES NOMINAL FIRST OUTLET IN |
| Water Inlet Location | DIRECTLY ABOVE EXHAUST INLET |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 3.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Flange Mounting Provision Spacing | 5-1/2 IN. DIA BOLT CIRCLE IN |
| Outlet Location | LOCATED 2-5/8 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 |
|---|---|
| PC630S6100-420654 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| PC630S6100-420654 | 5/9 Secondary reference U.S. Government activity |
| MILM15337 | 5/9 Secondary reference U.S. Government activity |
| MUW1-5-2 1-2-6896 | 5/9 Secondary reference Beaird Industries Inc. |
| MNBS | 5/9 Secondary reference Beaird Industries Inc. |
| BM3553 | 5/9 Secondary reference Cooper Cameron Corp Ajax-Superior Div |
| MUW2-5-2 1-2-7723 | 5/9 Secondary reference Beaird Industries Inc. |
NSN 2990-00-141-9210 is a Muffler,exhaust, manufactured by Naval Sea Systems Command, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-141-9210 has 1 manufacturer part number on file: PC630S6100-420654 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 2990-00-277-3634, 2990-00-516-4416. Verify interchangeability with system specifications before substitution.
Key specifications for PC630S6100-420654: Operating Position: HORIZONTAL; Inlet Location: LOCATED 2-1/4 IN. C TO C FROM HORIZONTAL CENTER LINE IN; Coolant Type: WATER; Design Type: WET. 23 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.