Shenzhen Zhonglichuang Bearing Co., Ltd. produces and sells dental drill bearings SR144Z, high-speed handpiece bearings SR144Z, 400,000 RPM dental drill handpiece high-speed bearings.

Dimensions: 6.35X3.175X2.38
Stainless steel hybrid ceramic ball bearings
Brand: PBL (Zhonglichuang Bearing)
Model: SR144Z
Inner Diameter: 3.175mm
Outer Diameter: 6.350mm
Thickness: 2.380mm
Material: Stainless steel with ceramic; Inner and outer ring material: Stainless steel 440; Ball material: Ceramic ball Si3N4  Precision: P4
The bearing material for dental handpiece bearings is crucial for their precision, performance, and lifespan. The ring material for high-speed turbine dental handpiece bearings should be made of special corrosion-resistant stainless steel, the ball material should be Si3N4 ceramic balls with a low thermal expansion coefficient, and the cage material should be TORLON polyimide, which is resistant to compression, impact, and high temperatures. In dental handpiece bearings, the turbine, bearing, and shaft are interference-fitted and rotate at high speed as a whole. The outer ring of the bearing is elastically supported in the housing by a rubber positioning ring, while the rear cover and spring ring serve to fasten and apply axial force. The housing is fixed inside the handpiece by positioning steel balls, and the collet mounted in the shaft hole clamps the drill bit at the other end for operation. Generally, the ball material for dental drill bearings is 440C stainless steel, used in lower-speed dental drill bearing applications. Si3N4 ceramic balls offer high hardness (1500~2000 HV), low centrifugal force, corrosion and friction wear resistance, and a low thermal expansion coefficient (only 25% of that of steel balls). Additionally, they absorb less heat, require lower cooling, and can operate in poor lubrication conditions, making them highly suitable as rolling element materials for high-speed dental drill bearings. The high-speed performance of dental drill bearings determines the importance of the dimensional accuracy and geometric tolerances of the cage. The processing equipment for dental drill bearing cages is a CNC lathe. This lathe offers high machining accuracy and excellent division performance, allowing the cage to be formed in one turning process without the need for traditional notch machining. Shenzhen Zhonglichuang Bearing Co., Ltd. specializes in: deep groove ball bearings, miniature bearings, flange bearings, stainless steel bearings, high-precision bearings, dental drill bearings, motor bearings, watch bearings, one-way needle roller bearings, flat thrust ball bearings, linear motion bearings, imported NMB bearings, imported ORIGIN bearings, and custom non-standard bearings based on drawings.

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