The Bushing,sleeve, cataloged under National Stock Number 3120-01-182-4173, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 14 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through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-01-182-4173 |
| Primary Part Number | 4M139BC-7-38 |
| Item Name | Bushing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Corner Shape | SQUARE INSIDE RIGHT CORNER |
| Corner Shape | SQUARE OUTSIDE RIGHT CORNER |
| Corner Shape | SQUARE OUTSIDE LEFT CORNER |
| Corner Shape | SQUARE LEFT FLANGE OUTSIDE RIGHT CORNER |
| Corner Shape | SQUARE INSIDE LEFT CORNER |
| Corner Shape | UNDERCUT LEFT FLANGE BODY CORNER |
| Flange Outside Diameter | 0.6770 INCHES MINIMUM AND 0.6970 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.5641 INCHES MINIMUM AND 0.5648 INCHES MAXIMUM IN |
| Style Designator | SOLID, EXTERNAL FLANGE ONE END |
| Material Document and Classification | QQ-C-530 FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Body Inside Diameter | 0.4310 INCHES MINIMUM AND 0.4325 INCHES MAXIMUM IN |
| Specification/standard Data | 76301-4-139 MANUFACTURERS STANDARD |
| Flange Width | 0.0600 INCHES MINIMUM AND 0.0620 INCHES MAXIMUM IN |
| Material | COPPER ALLOY 172 OR COPPER ALLOY 173 OVERALL |
| 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 |
|---|---|
| 4M139BC-7-38 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 4M139BC7-38 | C/1 Advisory reference — outside the item-of-supply concept Avalon Machine Products Inc |
| 4M139BC7-38 | C/1 Advisory reference — outside the item-of-supply concept Reid Products Inc. Dba Reid Products Inc |
| ST4M139BC-7-38 | 5/9 Secondary reference U.S. Government activity |
| ST4M139BC7-38 | 5/9 Secondary reference The Boeing Company Div Defense |
| ST4M139BC-7-38 | 5/9 Secondary reference Avalon Machine Products Inc |
| 4M139BC7-38 | C/1 Advisory reference — outside the item-of-supply concept All Power Manufacturing Co. |
| ST4M139BC-7-38 | 5/9 Secondary reference All Power Manufacturing Co. |
| 4M139BC7-38 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 4M139BC7-38 | C/1 Advisory reference — outside the item-of-supply concept Mayday Manufacturing Co. |
| ST4M139BC-7-38 | 5/9 Secondary reference Reid Products Inc. Dba Reid Products Inc |
NSN 3120-01-182-4173 is a Bushing,sleeve, manufactured by The Boeing Company Div Defense, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-182-4173 has 1 manufacturer part number on file: 4M139BC-7-38 (The Boeing Company Div Defense).
Key specifications for 4M139BC-7-38: Corner Shape: SQUARE INSIDE RIGHT CORNER; Corner Shape: SQUARE OUTSIDE RIGHT CORNER; Corner Shape: SQUARE OUTSIDE LEFT CORNER; Corner Shape: SQUARE LEFT FLANGE OUTSIDE RIGHT CORNER. 14 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.