The Bearing,sleeve, cataloged under National Stock Number 3120-01-031-9495, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Altra Industrial Motion Corp.. Government technical data includes 6 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-01-031-9495 |
| Primary Part Number | B58-7 |
| Item Name | Bearing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Altra Industrial Motion Corp. |
| Status | ACTIVE |
| Corner Shape | CHAMFERED ALL CORNERS |
| Body Outside Diameter | 0.5020 INCHES NOMINAL IN |
| Style Designator | SOLID, PLAIN, NO OUTSIDE FLANGES |
| Body Inside Diameter | 0.3140 INCHES NOMINAL IN |
| Material | COPPER ALLOY OVERALL |
| Material | OIL LUBRICATING LUBRICATION |
| 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 |
|---|---|
| B58-7 PRIMARY | Altra Industrial Motion Corp. (USA) |
NSN 3120-01-031-9495 is a Bearing,sleeve, manufactured by Altra Industrial Motion Corp., classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-031-9495 has 1 manufacturer part number on file: B58-7 (Altra Industrial Motion Corp.).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-486-6065. Verify interchangeability with system specifications before substitution.
Key specifications for B58-7: Corner Shape: CHAMFERED ALL CORNERS; Body Outside Diameter: 0.5020 INCHES NOMINAL IN; Style Designator: SOLID, PLAIN, NO OUTSIDE FLANGES; Overall Length: 0.8750 INCHES NOMINAL IN. 6 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.