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Runstar Bearing Manufactoring Co.,Ltd
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Street Address : Rm 201, Building 1th, Tianfuyuan, Shengli Dong Road, Xiangchen District, Zhangzhou City, Fujian Province, China
Tel : 86-596-2939612
Fax : 86-596-2910012
Contact Person:sophia
E-mail: sophia@runstarbearings.com
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2.Material of rings and balls
Update time : 2012-9-18 21:12:34
The ring and balls of our products are made of high carbon chrome bearing steel GCr15(AISI 52100) or stainless steel 9Crl 8 (AISI 440).
The following is the table for chemical composition of bearing steel and stainless steel.

Steel No
C%
Si%
Mn%
S%
P%
Cr%
GCr15
0.95-1.05
0.15-0.3
0.25-0.45
<0.025
<0.025
1.3-1.6
9Cr18
0.90-1.00
<0.8
<0.8
<0.04
<0.03
16-19

Material of retainer
The retainer are punch-pressed from brass strip (H62) or top quality cold-rolled steel strip (SPCC BQB402) ,as well as  reinforced engineering plastics if necessary .

RIBBON RETAINER It is made by 300 series of stainless steel and is widely used in miniature bearings which need a high speed and very smooth running.
 
 
CROWN RETAINER It is made by 400 series of stainless steel, with a light weight and special ball pockets to reduce torque and provide smooth runningusually it is widely used in miniature which just require slow speed,
 
 
PHENOLIC RETAINER: Plastic crown retainer has  the highest speed than other retainer. It can reduce the voice greatly which is widely used in dental handpiece or micro-motor.
 
 

 
Material of shields and rubbers
The shields are made of SPCC JISG314 or stainless steel (Icr18Ni9) strip, as well as synthetic rubber and Teflon.
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