Factory-Direct Distributor for EZO Bearings & Sapporo Bearings 

Sapporo Precision Bearings has set-up the most advanced bearing manufacturing plants in Ashibetsu, Hokkaido, Japan and in Shanghai, China. Furthermore, the products produced in Sapporo Precision Bearings' Precision plant in China are from the same exceptional quality Japanese steel and Japanese machinery used in the manufacturing process is the High Precision grade from Japan. This allows both  Japanese and Chinese factories to consistently supply highest quality, high-precision ball bearings to the world market.

There are over 800 "basic" EZO bearings with over 5,000 different kinds available (not including countless custom-made bearings). Sapporo Precision Bearings specialize in manufacturing High Precision Ball Bearings such as Miniature Precision Ball Bearings, Extra Thin Type bearings, Flanged Bearings and Stainless Bearings with sizes ranging from a mere 0.6 mm Bore diameter to 90 mm and O.D sizes from 2.5 mm to 100 mm. Sapporo Precision Bearings' standard material for rings and balls is a vacuum degassed high carbon chromium steel allowing for high efficiency, low torque, low noise level and long bearing life. For bearings requiring anti-corrosion or heat-resistance properties, KS440 martensitic stainless steel is used (see below for more information).

• Extra-miniature bearings are suitable for products requiring high-speed rotation, low-friction torque, low vibration and low noise. 

• Thin bearings facilitate design downsizing and weight saving. A wide variety of thin bearings is available. 

• Stainless steel resistant to rust and corrosion is used for manufacturing large-sized stainless steel bearings. 

• Extra- thin type flanged bearings are used for the downsizing and lightweight designing because of their thin cross section.

• The steel balls used in Sapporo Precision Bearings' precision products, conform ball bearing rolling element quality with minimum deviation of sphericity and surface roughness. The sizes range from a diameter of 0.3mm to 114.3mm and are available in either high carbon chromium steel, which offers high wear resistance and load carrying capacity or in stainless steel that offers corrosion and wear resistance.

• Standard-class products are manufactured at one class better than standard quality in dimensional accuracy.

• This type of bearing with high precision is suitable for products requiring low-torque, low vibration and high-speed rotation.

Miniature bearings are vital parts used in cars and trucks, computer peripheral equipment, audio and video devices and many other applications used in everyday life. With AST Bearings and Sapporo Precision Bearings working together you are assured of getting not only a the highest quality products in miniature ball bearings by Sapporo Precision Bearings, but a solution to precision applications and complete support from added-value services offered by AST Bearings.

The standard material for EZO rings and balls is a vacuum degassed high-carbon chromium steel. This allows for bearings with high efficiency, low torque, low noise level, and long bearing life.

However, for bearings requiring corrosion or heat-resistant properties, EZO uses the improved martensitic KS440 stainless steel (also known as ACD34) for all of its stainless steel bearings (not 440C as some bearing factories still do).

Contact us directly if you have a need for any EZO bearing products. AST is the USA's only authorized, national stocking, factory-direct distributor for EZO products and will provide you with "Value Beyond the Part™."