The Bearing,roller,tapered, cataloged under National Stock Number 3110-01-138-4566, is classified within Federal Supply Class 3110 (Bearings, Antifriction, Unmounted) of the Bearings group. The manufacturer of record is The Timken Corporation. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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 | 3110-01-138-4566 |
| Primary Part Number | 9278 CL7 AND 9220 CL2 |
| Item Name | Bearing,roller,tapered |
| FSC / FSG | 3110 / 31 — Bearings, Antifriction, Unmounted |
| Manufacturer | The Timken Corporation |
| Status | ACTIVE |
| Cup Width | 1.2500 INCHES NOMINAL IN |
| Style Designator | STRAIGHT BORE, NORMAL ANGLE |
| Overall Outside Diameter | 6.3750 INCHES NOMINAL IN |
| Backface Corner Radius | 0.1300 INCHES NOMINAL IN |
| Cone Corner Radius | 0.1400 INCHES NOMINAL IN |
| Standout Width | 0.6875 INCHES NOMINAL IN |
| Alignment Type | RIGID |
| Cone Width | 1.8125 INCHES NOMINAL IN |
| Bore Diameter | 2.6875 INCHES NOMINAL IN |
| Material | STEEL 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 |
|---|---|
| MA488 | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
| 9278 CL7 AND 9220 CL2 PRIMARY | The Timken Corporation (USA) |
NSN 3110-01-138-4566 is a Bearing,roller,tapered, manufactured by The Timken Corporation, classified under FSC 3110, Bearings, Antifriction, Unmounted. Status: active.
NSN 3110-01-138-4566 has 2 manufacturer part numbers on file: MA488 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic), 9278 CL7 AND 9220 CL2 (The Timken Corporation).
1 possible match (shared part number, not a government interchangeability claim): 5210-01-686-7828. Verify interchangeability with system specifications before substitution.
Key specifications for 9278 CL7 AND 9220 CL2: Cup Width: 1.2500 INCHES NOMINAL IN; Style Designator: STRAIGHT BORE, NORMAL ANGLE; Overall Width: 1.9375 INCHES NOMINAL IN; Overall Outside Diameter: 6.3750 INCHES NOMINAL IN. 10 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.