The Muffler,exhaust, cataloged under National Stock Number 2990-01-497-9937, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Minuteman International, Inc.. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 2990-01-497-9937 |
| Primary Part Number | 3320911 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Minuteman International, Inc. |
| Status | ACTIVE |
| Supplementary Features | ALUMINIZED STEEL CONSTRUCTION;COATED WITH SATIN BLACK PAINT RATED TO 1200 DEGREES FAHRENHEIT |
| Body Shape | ROUND |
| Specific Use | SPIRAL CHAMBER DESIGN ALLOWS FOR LOW BACK PRESSURE AS EXHAUST FLOWS THROUGH A UNIFORM CROSS-SECTION TO DIFFUSE AND PROGRESSIVELY ATTENUATE NOISE 1/3 THE SIZE AND 1/2 THE WEIGHT COMPARED TO MOST REACTIVE SILENCERS |
| Surface Treatment | PAINT |
| 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 |
|---|---|
| 3320911 PRIMARY | Minuteman International, Inc. (USA) |
| Reference | Meaning |
|---|---|
| FIG 7-47 INDEX 3 | 5/9 Secondary reference Powerboss Inc Div Minuteman Powerboss |
| 3320911 | 3/9 Design control — primary reference Powerboss Inc Div Minuteman Powerboss |
NSN 2990-01-497-9937 is a Muffler,exhaust, manufactured by Minuteman International, Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-497-9937 has 1 manufacturer part number on file: 3320911 (Minuteman International, Inc.).
Key specifications for 3320911: Supplementary Features: ALUMINIZED STEEL CONSTRUCTION;COATED WITH SATIN BLACK PAINT RATED TO 1200 DEGREES FAHRENHEIT; Body Shape: ROUND; Specific Use: SPIRAL CHAMBER DESIGN ALLOWS FOR LOW BACK PRESSURE AS EXHAUST FLOWS THROUGH A UNIFORM CROSS-SECTION TO DIFFUSE AND PROGRESSIVELY ATTENUATE NOISE 1/3 THE SIZE AND 1/2 THE WEIGHT COMPARED TO MOST REACTIVE SILENCERS; Special Features: ITEM KNOWN AS MUFFLER, SILENCER. 5 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.