The Ring,bearing,inner, cataloged under National Stock Number 3110-00-227-4672, 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 6 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3110-00-227-4672 |
| Primary Part Number | 1221U21 |
| Item Name | Ring,bearing,inner |
| FSC / FSG | 3110 / 31 — Bearings, Antifriction, Unmounted |
| Manufacturer | The Timken Corporation |
| Status | ACTIVE |
| Surface Finish | GROUND |
| Style Designator | SOLID INNER RACE, WITH BORE CHAMFER, JOURNAL AND NEEDLE |
| Overall Outside Diameter | 1.2655 INCHES MINIMUM AND 1.2660 INCHES MAXIMUM IN |
| Bore Shape | STRAIGHT |
| Bore Diameter | 0.9980 INCHES MINIMUM AND 0.9990 INCHES MAXIMUM 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 |
|---|---|
| 1221U21 | Meritor Industrial Products, Llc (USA) |
| 1221U21 | Meritor Heavy Vehicle Systems, Llc (USA) |
| 648653 | Am General Llc (USA) |
| 2140494 | General Motors Llc Dba General Motors Llc (USA) |
| 01760-0071 | Asrc Federal Facilities Logistics, Llc (USA) |
| 1221U21 PRIMARY | The Timken Corporation (USA) |
| Reference | Meaning |
|---|---|
| 01760-0071 | 5/9 Secondary reference U.S. Government activity |
| 111163 | 5/9 Secondary reference Komatsu American Intl Co |
| 1760-071 | 5/9 Secondary reference U.S. Government activity |
| 2140494 | 5/9 Secondary reference General Motors Corp |
| 1221U21 | 5/9 Secondary reference U.S. Government activity |
| 1221U21 | 5/9 Secondary reference Long-Airdox Co |
NSN 3110-00-227-4672 is a Ring,bearing,inner, manufactured by The Timken Corporation, classified under FSC 3110, Bearings, Antifriction, Unmounted. Status: active.
NSN 3110-00-227-4672 has 6 manufacturer part numbers on file: 1221U21 (Meritor Industrial Products, Llc), 1221U21 (Meritor Heavy Vehicle Systems, Llc), 648653 (Am General Llc), 2140494 (General Motors Llc Dba General Motors Llc), 01760-0071 (Asrc Federal Facilities Logistics, Llc) and 1 more.
4 possible matches (shared part number, not a government interchangeability claim): 1680-00-233-6040, 6750-01-381-2062, 5120-01-627-0617. Verify interchangeability with system specifications before substitution.
Key specifications for 1221U21: Surface Finish: GROUND; Style Designator: SOLID INNER RACE, WITH BORE CHAMFER, JOURNAL AND NEEDLE; Overall Width: 0.6100 INCHES MINIMUM AND 0.6300 INCHES MAXIMUM IN; Overall Outside Diameter: 1.2655 INCHES MINIMUM AND 1.2660 INCHES MAXIMUM 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.