Authorized, Factory-Direct Distributor for TPI Bearings

AST is a factory-direct distributor for TPI Bearings products

Since 1966, Tung Pei Industrial Co., Ltd. (TPI) has been an industry leader in providing a massive range of custom design ball bearings and bearing products for global industry. As an authorized distributor, AST has access to TPI's full product line.

TPI’s products are regarded among the highest precision bearings available, and their customer list of iconic brands (including Honda, Kawasaki, Suzuki, Yamaha, Hitachi, Panasonic, Emerson and Makita) reflects this reputation. Their three core principles of "Technology, Precision and Innovation" are central to their distinction in the marketplace, and empower them to consistently deliver a cutting edge selection of products.

TPI Bearings are recommended for a wide variety of applications, with some examples including:

  • Vehicles (ABS motors, alternators, drive trains, power transmissions, power steering, etc.)
  • Electric motors (air conditioners, ceiling fans, dryers, smoke extractors, speed-reducers, etc.)
  • Tools (grinders, sanders, drills, polishers, etc.)
  • Sports equipment (treadmills, bikes, elliptical trainers, steppers, etc.)
  • Tooling machines (spindles, ball screws, etc.)

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Below, we've compiled detailed information on TPI's top products:

Deep groove ball bearings 

Deep groove ball bearings are widely used bearing products. A deep groove is formed on each inner and outer ring of the bearing enabling them to sustain radial and axial loads in either direction as well as the combined loads which result from the combination of these forces.

Deep groove ball bearings are suitable for high-speed applications. In addition to the open type, deep groove ball bearings come in a number of varieties, including pre-lubricated bearings, bearings with one or both sides sealed or shielded, bearings with snap rings and high capacity specification, etc. Pressed cages are generally used in deep groove ball bearings. However, machined cages are also used in larger sized bearings designed for high-speed applications. 

Shielded ball bearings 

Shielded ball bearings are deep groove ball bearings having the same boundary dimensions as those of open type bearings. Protection against the penetration of foreign material and the prevention of grease leakage are provided by the steel shield of these bearings. There are two types: ZZ (fitted with shields on both sides) and Z (fitted with a shield on one side). Since the shields are a non-contact type, friction torque is very low. 

Sealed ball bearings 

Like shielded ball bearings, sealed ball bearings have the same boundary dimensions as those of the open type bearings. Sealed ball bearings also have the function of keeping foreign matter out and grease in with seals. Seals consisting of synthetic rubber molded to a steel plate are incorporated into the outer rings of these ball bearings.

There are two major types of sealed bearings: contact type and non-contact type sealed bearings. The LLU type is equipped with two contact seals, one on each side of the bearings while the LLB type uses non-contact type seals instead. Similar construction to LLU type, the LLH type sealed bearings perform better low torque characteristics than that of LLU type because of its special lip design. Basically, bearings with contact seals have excellent and effective functions of dust and waterproofing while bearings with non-contact seals are suitable for applications requiring low torque operation. 

Expansion compensating bearings 

Expansion compensating bearings have the same boundary dimensions as standard bearings, except that a high polymer material with a large coefficient of thermal expansion has been inserted along the outer circumference of the outer ring. Due to the extremely small difference of thermal expansion attained between the fitted surfaces of the high polymer and the light alloy bearing housing, a good interference fit can be achieved with stable performance across a wide temperature range. Another advantage is a large reduction in the occurrence of outer ring creeping. 

In cases where the bearing is going to be interference fit with the housing, it is very important not to damage the high polymer material. Regulations for radial internal clearance are the same as those for standard deep groove ball bearings. For standard fit and application conditions, a C3 clearance is used with this bearing. 

CSB ball bearings 

CSB bearings have the same boundary dimensions as standard deep groove ball bearings but have undergone a special heat treatment that considerably extends wear life. These bearings are especially effective in countering reduced wear life due to the effects of infiltration by dust and other foreign matter. CSB 62 series bearings can be used in place of standard 63 series bearings enabling lighter weight, more compact designs. 

ESB bearings 

ESB bearings also share the same boundary dimensions as deep groove ball bearings but have undergone a special heat treatment and surface structure stabilization with nitrogen under the proper material and conditions. ESB bearings are designed to be able to withstand in the harsh lubrication condition containing hard foreign matter. These bearings enhance wear property and fatigue life even superior to CSB bearings under such condition.

AC bearings (creep prevention bearings) 

AC bearings have the same boundary dimensions as standard bearings with the addition of two O-rings embedded in the outside circumference of the outer ring. This bearing has a steel housing, can withstand rotating outer ring loads, and is suitable for applications where a “tight fit” is not possible but the fear of creeping exists. With its capacity for axial load displacement, an AC bearing can also be installed as a floating side bearing to accommodate shaft fluctuations.

TS bearings 

Special care is needed for bearings used in high operating temperature, such as 120°C and above. The TS bearings are designed to accommodate such strict condition. These TS bearings are dimension stabilized and can withstand operation with high temperature up to 250°C. 

Low noise bearings 

The smaller sizes of series 60 and 62 with shields and seals are also available in a special low noise quality for applications where silent running is of prime importance, such as the application of fan motors in air conditioning. The low noise bearings require good running accuracy and made by improved washing and assembly manufacturing process. In addition, the bearings are usually pre-lubricated with low noise grease. In order to prevent fretting corrosion on raceways and balls of bearings due to poor transportation condition in some areas, the grease with good fretting resistance and low noise characteristics is selected and performs well in such condition. 

Angular contact ball bearings

In mechanical design, subject to both radial and axial loads, the so-called angular contact bearings are recommended. According to various load ratio of axial to radial load, these bearings with appropriate contact angle may be applied. They are usually applied in duplex arrangement to gain axial rigidity. In high-speed spindle application, angular contact ball bearings need to be adjusted with higher dimensional and running accuracy, precision cage and used in an appropriate way of lubrication to reach their maximum speed. 

Other types of angular contact ball bearings include thrust angular contact bearings and double row angular contact ball bearings. Thrust angular contact bearings with a larger contact angle of 60° boast greater axial rigidity. Besides, since balls are used as the rolling elements, the starting torque of an angular contact thrust ball bearing is less than that of a roller bearing. The structure of double row angular contact ball bearing is designed by arranging two single row angular contact bearings back-to-back in duplex (DB) to form in one bearing with a contact angle of 30°. These bearings are capable of accommodating radial loads, axial loads in either direction and have a high capacity for momentary loads as well.

Stainless ball bearings 

Stainless ball bearings have the same boundary dimensions and ISO tolerance as standard deep groove ball bearings but have better corrosive resistance than standard bearings in special environments. The rings and balls of these bearings are made of martensite stainless steel with hardness at least HRc 58, while cages and shields are made of austenite stainless steel.

Cylindrical roller bearings 

Cylindrical roller bearings have a larger load carrying capacity which makes them more suitable for applications requiring long life and endurance for heavy loads and shock loads. Cylindrical roller bearings can be categorized into cylindrical roller bearings and needle roller bearings, according to its roller dimension ratio (the ratio of roller length to its diameter). 

Ball Screw Support Units

TPI offers 4 types of precision Ball Screw Support Units: TBK Series, TFK Series, TBF Series and TFF Series. The designs of these 4 types have all been standardized, making these support units the perfect choice for a Ball Screw assembly. All of TPI Ball Screw Support Units are equipped with TPI's own High Precision Angular Contact Ball Bearings, calibrated with precise preload to guarantee that the whole assembly operates with high rigidity, high accuracy, and high stability. TPI's Angular Contact Ball Bearings contain high durable grease that effectively increases the support unit's life, so re-lubrication will not be necessary. TPI Ball Screw Support Units are available in rectangular and round shapes to accommodate various working requirements. 

TPI Ball Screw Support Units are optimized to save space. They can be easily installed and adapted to small working space. Since the bearings inside TPI Ball Screw Support Units have been adjusted with appropriate preload, they can be assembled with the ball screws without further machining. You will gain the advantage of reduced installation time and increased ball screw assembly accuracy. There are 2 choices of surface treatment for TPI Ball Screw Support Unit: black oxidizing finish and electroless nickel plating finish. Both are highly effective against corrosion in a harsh working environment. After 72 hours of withstanding in a salt spray chamber, TPI Ball Screw Support Units with nickel plating surface still look brand new. 

You may contact us regarding anything within the TPI Bearing Catalog.  Together with AST Bearings' value-added services and cutting edge bearing technology, you receive a guaranteed economical solution in design and application.

How to Purchase TPI Bearing Products

Contact us directly if you have a need for any TPI products. AST is an authorized, factory-direct distributor for TPI products and will provide you with "value beyond the part."

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