33121 3007721E 33121R Chrome Steel 105*175*56mm Single Row Cone and Cup Tapered Roller Bearings

33121 3007721E 33121R Chrome Steel 105*175*56mm Single Row Cone and Cup Tapered Roller Bearings

The smooth contact between tapered rollers and raceways (enabled by P6-level precision and polished surfaces) reduces rotational friction by 68-76% compared to standard large-size bearings. This delivers two key benefits:
Energy Efficiency: Lowers power consumption for 80-90kW motors by 17-20%—equivalent to saving 1,700-2,000 kWh/year for a motor running 8 hours/day, 5 days/week. This aligns with global industrial energy efficiency standards (e.g., IE3, IE4) and reduces long-term operational costs (e.g., $200-$260/year in electricity savings per motor).
Temperature Control: Maintains operating temperatures within -30°C to 120°C (typically ≤166°C under full load), preventing degradation of industrial seals (e.g., nitrile rubber gaskets in high-pressure pumps, Viton O-rings in CNC tools) or high-strength composite components (e.g., heavy-duty gearbox covers made of carbon-fiber reinforced plastic).
Tight P6-level tolerance also ensures ultra-quiet operation: ≤6dB at 1m for 33121/3007721E and ≤7dB at 1m for 33121R. Well below the industrial noise limit of 85dB, it is suitable for indoor factories, mining facilities, or construction sites where operator comfort (OSHA noise limits: ≤90dB over 8 hours) and noise compliance are priorities.

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