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

Shandong Star Create Bearings Technology Co., Ltd.
1. Corporate background and production strength
Twenty years of deep cultivation in the industry
Founded in 2000, the company focuses on bearing research and development and manufacturing, has more than 20 years of technical accumulation, and completed the upgrade of the modern production base in 2020.
Scaled production guarantee
The new factory is located in Guangtao County Bearing Creative Industrial Park, covering an area of ​​27,000 square meters, with a registered capital of 5 million yuan, equipped with advanced production lines, and an annual production capacity covering millions of sets of high-precision bearings.

2. Core product technology matrix
The company focuses on the mid-to-high-end bearing market and focuses on four major categories of products:
High-precision tapered roller bearings
Applicable to heavy-duty machinery, engineering vehicles and other fields, with high speed and impact resistance.
Automobile hub unit bearings
Meet the lightweight needs of new energy vehicles and passenger cars, and the integrated design reduces maintenance costs.
Deep groove ball bearing series
Covering civilian industrial scenarios such as home appliances and motors, with industry-leading silent performance and service life.
Thrust ball bearing solutions
For axial load Load scene optimization, widely used in precision transmission systems such as machine tool spindles and gearboxes.

3. Flexible customization service capabilities
Multi-brand OEM system
Supports the production of international standards (such as SKF, NSK) or independent brand bearings according to customer needs, covering ISO, DIN, JIS and other certification systems.
Quick response mechanism
The delivery cycle from drawing design to sample delivery is compressed to 15-30 days, providing customized services such as material selection (chrome steel/ceramic) and lubrication solutions.

4. Industry positioning and development strategy
As a representative enterprise of bearing industry upgrading in North China, the company is driven by "technology research and development + intelligent manufacturing":
Investment in the construction of an intelligent testing center, and the yield rate of key processes has increased to 99.3%
Layout of bearing research and development in emerging fields such as rail transit, wind power and new energy
Build a global sales network, and products are exported to Europe, the United States, and Southeast Asian markets

Company vision: to create a benchmark for China's precision bearing intelligent manufacturing and help the localization substitution process of high-end equipment.