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6301 Deep Groove Ball Bearing 12×37×12mm | Yuanhe
At 12mm bore and 37mm OD, the 6301 bearing occupies the entry point of the 6300 medium-series deep groove ball bearing family. When a 6201 bearing (12×32×10mm) reaches its load limit on a 12mm shaft, the 6301 adds 42% more dynamic capacity through a 5mm OD increase and 2mm width increase. The result is 9.72 kN dynamic load and 5.08 kN static load in a bearing that still fits compact housings.
Key Specifications
- Sealing Open, ZZ non-contact metal shields, or 2RS double nitrile rubber contact seals. Three configurations covering oil-bath, grease-packed, and contamination-resistant installations.
- Speed and Load 20,000 RPM (open), 17,000 RPM (ZZ), 14,000 RPM (2RS). 9.72 kN dynamic load (Cr), 5.08 kN static load (Cor) at standard CN clearance.
- Material and Precision GCr15 bearing steel (equivalent to AISI 52100), through-hardened to HRC 60-64. Standard ABEC-3. ABEC-5 available on request. 100% dimensional inspection with batch reports. ISO 9001:2015 certified factory.
- Operating Direction Designed for radial loads. Deep groove raceway geometry supports bidirectional axial loads up to approximately 20% of the dynamic radial rating under light to moderate speeds.
- Temperature Range -40°C to 120°C with NBR seals and standard polyurea-mineral grease fill. High-temperature grease variants extend to 150°C. Fluorocarbon seal option for wider thermal range.
For any inquiries, please contact with our Supporting Team at sales@yuanhecd.com.
| Model | 6301 |
| Bearing Type | Deep Groove Ball Bearing, Single Row |
| Sealing | Open / ZZ (Metal Shield) / 2RS (Rubber Seal) |
| Bore Dia. (d) | 12 mm |
| Outside Dia. (D) | 37 mm |
| Width (B) | 12 mm |
| Precision | ABEC-3 (Standard), ABEC-5 Available |
| Dynamic Load (Cr) | 9.72 kN |
| Static Load (Cor) | 5.08 kN |
| Max Speed | 20,000 RPM (Open) / 17,000 (ZZ) / 14,000 (2RS) |
| Temp. Range | -40°C to 120°C (NBR) / Up to 150°C (HT Grease) |
| Ring & Ball Material | GCr15 (AISI 52100), HRC 60-64 |
| Seal Material (2RS) | Nitrile Rubber (NBR) + Steel Insert |
| Lubrication | Polyurea-Mineral Grease, NLGI 2 |
Bore x OD x Width
12 x 37 x 12 mm
Dynamic Load Cr
9.72 kN
Static Load Cor
5.08 kN
Max Speed
20,000 RPM
Sealing
Open / ZZ / 2RS
Precision
ABEC-3
Shielding and Lubrication
The 6301 bearing ships in three sealing configurations, each matched to a distinct operating environment. Open bearings (no seals) run in oil-bath or circulating-oil systems where external lubrication is already present. Without seal drag, the open 6301 bearing reaches 20,000 RPM, making it the correct choice for high-speed spindle and motor applications where the housing provides contamination control.
ZZ metal-shielded bearings use non-contact steel shields pressed into the outer ring. The 0.2mm to 0.4mm gap between shield and inner ring land keeps out coarse particles without generating friction heat. ZZ 6301 bearings run to 17,000 RPM and suit electric motor, fan, and pump applications where moderate dust protection is sufficient and speed matters more than full sealing.
2RS rubber-sealed bearings use nitrile contact seals riding on the inner ring land. The 12mm width of the 6301 bearing provides a larger grease reservoir than the 6201 bearing (10mm width), extending relubrication intervals. At 14,000 RPM, the 2RS 6301 handles agricultural equipment, conveyor rollers, and outdoor machinery where water, mud, and abrasive dust are routine. The contact seal lip generates measurable drag expect 2°C to 5°C higher steady-state temperature than the equivalent ZZ bearing at the same speed.
Performance
The 6301 bearing delivers 9.72 kN dynamic load capacity (Cr) and 5.08 kN static load capacity (Cor). Compared to the 6201 bearing on the same 12mm shaft, the 6301 bearing provides a 42% increase in dynamic load and a 67% increase in static load. This comes from a 5mm larger OD (37mm vs 32mm) and 2mm wider cross-section (12mm vs 10mm). The larger section accommodates larger-diameter balls and deeper raceway grooves. For a design running a 6201 bearing at 6.82 kN Cr near its fatigue limit, switching to a 6301 bearing at the same 12mm shaft diameter extends calculated L10 life by a factor of approximately 2.8, assuming identical load and speed.
Against the 6300 bearing (10×35×11mm), the 6301 bearing adds 2mm of bore diameter while increasing dynamic capacity by 21% (9.72 kN vs 8.06 kN). For designers constrained to a 12mm shaft but with housing space for a 37mm OD bearing, the 6301 bearing represents the highest-capacity single-row deep groove ball bearing in its bore class. Moving one step up to the 6302 (15×42×13mm) gains 1.68 kN more dynamic load at the cost of a 3mm larger shaft diameter. This positions the 6301 bearing as the load-capacity ceiling for 12mm shaft designs.
Radial internal clearance is CN as standard. For interference-fit housings (steel in aluminum, or heavy press fits), C3 clearance compensates for thermal expansion and ring compression. At C3 clearance and moderate axial load (≤1.9 kN), the contact angle shifts approximately 8° to 12°, sufficient for combined radial-axial loading in gearbox and actuator applications.
OEM and Customization
Yuanhe supplies the 6301 bearing with full customization for volume OEM orders. Non-standard radial clearances (C2, C3, C4) are stocked or produced to order. Lubrication options include low-torque synthetic grease for instrument applications, food-grade grease (NSF H1 registered) for processing equipment, and high-temperature polyurea grease rated to 150°C continuous. Stainless steel 440C rings and balls are available for corrosive or washdown environments note that 440C derates dynamic load capacity by approximately 15% compared to GCr15.
Cage options stamped steel (standard, to 20,000 RPM), glass-reinforced polyamide (reduced weight, lower noise, to 14,000 RPM), or machined brass (high-speed stability above 17,000 RPM). Standard MOQ is 100 pieces per configuration. Sample orders of 10 to 50 pieces ship within 7 days. Every order includes a dimensional inspection report covering bore, OD, width, radial runout, and radial clearance. ISO 9001:2015 certified. Submit your drawing or specification for a same-day quote.
Applications
Electric motor rotors and stators under 3 kW, industrial cooling fans and blowers, conveyor head and tail pulleys, centrifugal pump shafts, agricultural tiller and mower spindle assemblies, power tool armatures and gear trains, HVAC blower wheels and condenser fan motors, small gearbox input and output shafts, textile machinery rollers and tensioners, fitness equipment cranks and pulley assemblies, compact actuator and linear drive lead screws. Any application requiring a 12mm shaft with bearing loads between 7 kN and 10 kN radial.
Frequently Asked Questions
When should I choose the 6301 bearing over 6201 for a 12mm shaft? +
Choose the 6301 bearing when the 6201 bearing (12×32×10mm, 6.82 kN Cr) operates near its fatigue limit or shows shortened service intervals. The 6301 bearing adds 42% dynamic capacity (9.72 kN vs 6.82 kN) through a 5mm larger OD and 2mm wider cross-section, extending calculated L10 life by approximately 2.8× at identical load. If your housing has radial space for a 37mm OD and the 12mm bore is fixed, the 6301 bearing is the highest-capacity deep groove ball bearing available without changing shaft diameter.
What is the maximum axial load a 6301 bearing can handle at speed? +
At standard CN clearance and speeds below 10,000 RPM, the 6301 bearing supports sustained axial loads up to approximately 1.9 kN (roughly 20% of Cr). For combined loading at higher speeds, contact angle shifts to 8° to 12° depending on clearance and axial preload. Install with C3 clearance if axial loads approach 25% of Cr, as the added radial slack allows deeper ball engagement without edge loading the raceway shoulder. For predominantly axial loads, a 7201 angular contact bearing is the correct pairing.
Can a 6301 bearing replace a 6300 bearing in an existing housing? +
No direct drop-in replacement. The 6301 bearing has a 12mm bore versus the 6300 bearing 10mm bore. The ODs differ as well (37mm vs 35mm) and widths differ (12mm vs 11mm). If your design can accommodate a 2mm shaft diameter increase and a 2mm housing bore increase, the 6301 bearing delivers 21% more dynamic capacity (9.72 kN vs 8.06 kN). In many retrofit scenarios, the more practical upgrade for a 10mm shaft at its load limit is moving from a 6200 bearing to a 6300 bearing within the same 10mm bore class.
What relubrication interval should I expect from a 2RS sealed 6301 bearing? +
A 6301-2RS bearing filled with standard polyurea-mineral grease (NLGI 2) operates sealed-for-life in most industrial applications. The 12mm width provides a larger grease reservoir than the 10mm-wide 6201-2RS. At 14,000 RPM and 70°C continuous, expect a grease life of 2,000 to 4,000 hours under moderate radial load (≤1.5 kN). Halve load or reduce speed by 30%, and grease life approximately doubles. For applications requiring relubrication, specify the ZZ configuration and integrate a grease nipple into the housing design.
