The Bearing,sleeve, cataloged under National Stock Number 3120-00-321-9243, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 22 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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 | 3120-00-321-9243 |
| Primary Part Number | M81934/1-20C020 |
| Item Name | Bearing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY |
| Surface Finish | 63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY |
| Surface Finish | 125.0 MICROINCHES RIGHT END SURFACE OF BODY |
| Surface Finish | 125.0 MICROINCHES LEFT END SURFACE OF BODY |
| Corner Shape | SQUARE ALL CORNERS |
| Body Outside Diameter | 1.4393 INCHES MINIMUM AND 1.4398 INCHES MAXIMUM IN |
| Style Designator | SOLID, PLAIN, NO OUTSIDE FLANGES |
| Body Inside Diameter | 1.2505 INCHES MINIMUM AND 1.2515 INCHES MAXIMUM IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE INNER LAYER |
| Material | STEEL COMP 630 OUTER LAYER |
| 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 |
|---|---|
| BJ40TH-20C020 | Rbc Aircraft Products, Inc. (USA) |
| M81934/1-20C020 PRIMARY | Sae International Dba Sae International (USA) |
| BJ40TH-020 | Rbc Aircraft Products, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 06-282-20C020 | 5/1 Secondary reference Rbc Transport Dynamics Corp Div Rbc Transport Dynamics |
| BJ40TH20C020 | 5/9 Secondary reference Timken Co Div the Timken Company |
| KRJ20SB-20C020M | 5/1 Secondary reference Kamatics Corporation |
| M81934/1-20C020 | 5/9 Secondary reference U.S. Government activity |
| ST4M128-20C020 | 5/9 Secondary reference The Boeing Company Div Defense |
| KDJ20C020-16 | 5/1 Secondary reference U.S. Government activity |
| 91086-20C020 | 5/1 Secondary reference Rbc Transport Dynamics Corp Div Rbc Transport Dynamics |
| SAE-AS81934/1 | 3/1 Design control — primary reference Sae International Dba Sae International |
| AD20C020 | 5/1 Secondary reference New Hampshire Ball Bearings Inc Div Astro Division |
| M81934/1-20C020 | 5/9 Secondary reference U.S. Government activity |
| 117-21-20-020 | 5/9 Secondary reference Rexnord Industries, Llc Div Aerosspace Bearing Operation |
| MIL-B-81934 | 5/9 Secondary reference U.S. Government activity |
| AHJ20C020 | 5/1 Secondary reference New Hampshire Ball Bearings Inc Div Precision Division |
| AS81934 | 5/1 Secondary reference Sae International Dba Sae International |
| NAS537 | 5/9 Secondary reference U.S. Government activity |
| SAEAS81934 | 5/9 Secondary reference U.S. Government activity |
| BJ40TH020 | 5/9 Secondary reference Timken Co Div the Timken Company |
| ATT20SS020 | 5/1 Secondary reference New Hampshire Ball Bearings Inc Div Astro Division |
| AS81934 | 5/9 Secondary reference U.S. Government activity |
| KDJ20C020-341 | 5/1 Secondary reference U.S. Government activity |
NSN 3120-00-321-9243 is a Bearing,sleeve, manufactured by Sae International Dba Sae International, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-00-321-9243 has 3 manufacturer part numbers on file: BJ40TH-20C020 (Rbc Aircraft Products, Inc.), M81934/1-20C020 (Sae International Dba Sae International), BJ40TH-020 (Rbc Aircraft Products, Inc.).
8 possible matches (shared part number, not a government interchangeability claim): 3120-00-321-9251, 3120-00-323-1531, 3120-00-612-2946. Verify interchangeability with system specifications before substitution.
Key specifications for M81934/1-20C020: Surface Finish: 125.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY; Surface Finish: 63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY; Surface Finish: 125.0 MICROINCHES RIGHT END SURFACE OF BODY; Surface Finish: 125.0 MICROINCHES LEFT END SURFACE OF BODY. 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.