31306 27306E 31306R Chrome Steel 30*72*20mm Single Row Cone and Cup Tapered Roller Bearings

31306 27306E 31306R Chrome Steel 30*72*20mm Single Row Cone and Cup Tapered Roller Bearings

Built to ISO 355/DIN 720 standards with P6-level precision (minimal vibration and misalignment), the dimensions are optimized for space-constrained light-to-medium setups:
30mm Inner Diameter (ID): Fits small industrial shafts (tolerance: 0/-0.013mm) and accommodates a minimum 2.0mm shaft chamfer. The tight tolerance ensures a secure H7/k6 interference fit with 5-10kW motor shafts, small CNC spindle shafts, or medium seeder drive rollers—preventing slippage even under torque surges (e.g., small lathe cutting thin metal blocks, medium mixer stirring low-viscosity pastes).
72mm Outer Diameter (OD): Seamlessly integrates into compact housings (compatible with a minimum 1.8mm outer ring chamfer), eliminating oversized enclosures. Critical for small industrial pumps, compact gearboxes, or portable construction tools (e.g., small drills) where space is limited.
20mm Width: Provides a 20% larger contact area than narrower bearings of similar ID/OD, ensuring balanced radial-axial load distribution. Ideal for small vibrating screens (sorting 5-35mm granular materials) or auxiliary shafts in medium agricultural machinery.
CNC grinding (±0.004mm precision) guarantees dimensional consistency, eliminating fit gaps that cause 96-98% efficiency loss in misaligned bearings.

The Shipping Way We Use

We use the main delivery companies are as below

We normally will dispatch your order within 2-7 working days depends on stock level, as soon as the order is shipped, we will list the tracking number on your order detail page, if there is any problem regarding to the shipping, please feel free to contact us. 

Below shows the estimate delivery time for different courier:

- DHL: 10-14 working days 
- FedEx: 7 to 10 working days 
- UPS: 7 to 10 working days 
- EMS: 10-14 working days