Twelve millimeters is a workhorse shaft diameter in compact power tools, office equipment, and light industrial machinery. The 6901 bearing mates to this shaft with a 24mm outside diameter and 6mm width : the narrowest OD envelope available for a 12mm-bore deep groove ball bearing. Three seal configurations share 2.89 kN dynamic capacity and 1.46 kN static capacity from the same GCr15 ring-and-ball set. ABEC-3 precision and 30,000 RPM capability make it the bearing engineers specify when radial space is the binding constraint.
For any inquiries, please contact with our Supporting Team at sales@yuanhecd.com.
Deep groove ball bearing 6901 with 12mm bore, 24mm OD, and 6mm width. Three sealing configurations (Open, ZZ, 2RS) from the same GCr15 ring-and-ball set. ABEC-3 precision, 2.89 kN dynamic load, 1.46 kN static load, up to 30,000 RPM.
Bore x OD x Width
12x24x6 mm
Dynamic Load (Cr)
2.89 kN
Static Load (Cor)
1.46 kN
Max Speed
30,000 RPM
Sealing
Open / ZZ / 2RS
Precision
ABEC-3
| Model | 6901 |
| Type | Open / Shielded / Sealed |
| Bore Dia. | 12 mm |
| Outside Dia. | 24 mm |
| Width | 6 mm |
| ABEC Tolerance | ABEC-3 |
| Dynamic Load Capacity | 2.89 kN |
| Static Load Capacity | 1.46 kN |
| Max. RPM | 30,000 RPM |
| Temp. Range | -20~120°C |
| Material | GCr15 Chrome Steel |
| Seal / Shield Material | NBR rubber (2RS) / SPCC steel (ZZ) |
| Lubrication | Polyurea grease (standard) |
At 12mm bore, seal selection involves a trade-off most engineers recognize: contact seals protect better but add measurable drag at high RPM. The 6901 bearing makes this choice explicit. The 6901 Open bearing delivers the full 30,000 RPM with zero seal friction. It accepts oil-mist lubrication directly through the exposed ball path, which is why gearbox designers and pump manufacturers specify it for oil-bath environments where the housing already provides the contamination barrier.
The 6901 ZZ bearing presses SPCC steel shields into outer-ring grooves. The shields never contact the inner ring, so the 30,000 RPM ceiling stays intact. A 0.15-0.25mm labyrinth gap around the inner ring shoulder blocks dust and coarse particles but passes oil mist and fine moisture. Factory-filled polyurea grease covers the -20°C to 120°C range. ZZ is the default choice for enclosed fan motors, office equipment drives, and power tool armatures where the bearing sees intermittent splash but not direct spray.
The 6901 2RS bearing uses nitrile rubber contact seals riding in inner-ring grooves. At 12mm bore, the seal contact circumference is only 38mm; the drag torque is proportionally lower than on larger bearings. This keeps the 2RS speed limit at ~24,000 RPM rather than the more severe derating seen on 17mm+ bore sizes. The positive-contact lip blocks sub-micron dust, direct water spray, and humid air. Choose 2RS for outdoor power equipment, agricultural sprayers, and gym equipment where the bearing faces sweat and cleaning chemicals.
At 2.89 kN dynamic load, the 6901 bearing carries roughly 40% more radial load than the 6900 bearing (10mm bore, 2.02 kN) while adding only 2mm to bore and 2mm to OD. The 6mm width stays constant across the 6900 bearing and 6901 bearing; the load gain comes entirely from the larger ball complement enabled by the 2mm bore increase. For engineers upgrading a 10mm shaft design to 12mm, the 6901 bearing often drops into the same housing footprint after a simple rebore from 22mm to 24mm. No housing redesign. No increased width. Just more load capacity.
The 6901 bearing also holds a unique position against the 6001 bearing. Both fit a 12mm shaft, but the 6001 needs a 28mm housing bore and 8mm width. The 6901 bearing saves 4mm in diameter and 2mm in width; a 25% smaller radial cross-section. The trade-off: the 6001 carries 5.10 kN dynamic load (77% more). If the housing envelope is fixed at 24mm OD and the load stays under 2.9 kN, the 6901 bearing is the only standard 12mm-bore option that fits. No custom thin-section bearing required.
ABEC-3 radial runout of 0.013mm is standard. The 6mm width, shared with the 6900 bearing, keeps the bearing narrow enough for paired mounting in gearboxes and compact enough that it does not dictate the tool grip diameter in hand-held power tools. At 30,000 RPM on a 12mm shaft, the bearing surface speed at the ball-race contact reaches approximately 12 m/s; well within the capability of standard polyurea grease without oil-mist supplementation.
Yuanhe delivers the 6901 bearing with C3 radial clearance and polyurea grease as the production standard. For OEM orders, four customization paths cover the majority of application-specific requirements:
MOQ for modified clearance or custom grease starts at 500 pcs. Submit your bearing drawing or part number for a quote that includes lead time and batch inspection terms.
English
French
German
