The Bushing,sleeve, cataloged under National Stock Number 3120-01-436-3370, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Mayday Manufacturing Co.. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 3120-01-436-3370 |
| Primary Part Number | 4M139BC7-15 |
| Item Name | Bushing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Mayday Manufacturing Co. |
| Status | ACTIVE |
| Material | COPPER ALLOY 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 |
|---|---|
| 4M139BC7-15 PRIMARY | Mayday Manufacturing Co. (USA) |
| 4M139BC7-15 PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| 4M139BC7-15 PRIMARY | All Power Manufacturing Co. (USA) |
| 4M139BC7-15 PRIMARY | Avalon Machine Products Inc (USA) |
| Reference | Meaning |
|---|---|
| 4M139BC7-15 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 4M139BC7-15 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3120-01-436-3370 is a Bushing,sleeve, manufactured by Mayday Manufacturing Co., classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-436-3370 has 4 manufacturer part numbers on file: 4M139BC7-15 (Mayday Manufacturing Co.), 4M139BC7-15 (Reid Products Inc. Dba Reid Products Inc), 4M139BC7-15 (All Power Manufacturing Co.), 4M139BC7-15 (Avalon Machine Products Inc).
Key specifications for 4M139BC7-15: Overall Length: 0.150 INCHES NOMINAL IN; Special Features: MATERIAL: BERYLLIUM COPPER, NO FINISH; Part Name Assigned by Controlling Agency: BUSHING,SLEEVE-CLOSE TOLERANCE FLANGE,PRESS FIT,REDUCED CHAMFER AND UNDERCUT,BRONZE CORROSION RESISTANT STEEL AND BE CU; Material: COPPER ALLOY OVERALL. 1 specification is 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.