Tungtai Bearings (International) Ltd . has owned many high-skilled technicians. We hire some high level technical experts as our consultants, who have a long and good experience in a miniature ball bearing factory invested by a Japanese. In addition, we build up some experienced technicians from our experienced workers. We carry out all our production and business strictly according to ISO9001:2000 standard. It is with competent technical force, advanced producing process, precision machines, accurate inspect system and strict management that We aim at the zero defect, better service and providing more privillage to our customers.
::::CLEANLINESS::::
Strict cleanliness is an essential condition for the good operation of all miniature bearings. Tungtai Bearings are made under strict conditions of cleanliness in accordance with ISO Standard (An international standard of quality).

::::MATERIALS::::
Most bearings are made from either STAINLESS STEEL or BEARING STEEL. Unless there is a problem with corrosion you should not notice any difference in performance for hobby applications. If corrosion is a problem then you should be using STAINLESS STEEL bearings.

::::PROBLEM SOLVING::::
Problem
Cause
Remedy
Noise
High pitched metallic
Poor lubrication Improve lubrication
Clearance too small Correct clearance
Poor fitting Investigate mounting method and seating
Excessive load Examine shaft and housing tolerances for closing effect
Low pitched metallic
Brinelled raceway Avoid shock loads
Regular
Rust or damage Check & replace seals & relubricate
Flaking of raceway surface Improve lubrication & check fitting, clearance and fixing method
Irregular
Ingress of foreign matter Check & replace seals and relubricate
Excessive clearance Correct clearance
Damage & flaking of rolling element Reduce loads and/or clearance
Variable
Varying clearance due to temperature changes Check fits taking housing material and temperature into consideration
Damage to raceways Improve lubrication & check fitting, clearance and fixing method
Heavy vibration Flaking of raceway and rolling element Improve lubrication & check fitting, clearance and fixing method
Ingress of foreign matter Check & replace seals and relubricate
Excessive clearance Correct clearance
Poor location Ensure abutment face and fitting diameter are perpendicular
Excessive heat generation
Clearance too small Correct clearance
Poor location Ensure abutment face and fitting diameter are perpendicular
Excessive load Examine shaft and housing tolerances for closing effect
Poor lubrication Improve lubrication
Creep Maintain recommended shaft & housing fits
  Lubrication breakdown Too much grease Use correct lubricant quantity
Ingress of foreign matter Check & replace seals and relubricate
::::SEALS & SHIELDS::::
Basically, shields and seals are both designed to keep contaminants out of the bearing and to keep the lubricant in.

Shields are made from steel, whilst seals are made from rubber or teflon. In simple terms the main types are as follows.

Generally, the color of teflon seals of Basico Bearings may be light yellow and blue. The color of rubber seals are also colorful. They may be red, yellow, blue, brown and black.

Ratings 1=Excellent 2=Very Good 3=Good 4=Fair

 
Sealing Ability
Allows for Bearing to Spin Freely
Affordability
Shields (Steel)
3
1
1
Seals (Contact)
1
3
2
Seals (Non Contact)
2
2
2
Seals (Teflon)
1
1
4
 
::::PRECISION GRADES::::
 
Bearings are manufactured to various precision grades. The precision grade of a bearing ultimately affects the bearings performance. As the precision grade increases from ISO P0 upwards towards ABEC 7. The price increases and the bearing performance increases.
 
::::RADIAL CLEARANCE::::
 
The radial clearance of a bearing has nothing to do with quality, but if badly chosen or altered in any way during mounting, it can reduce the working life of a bearing. Most bearings for hobby applications should be in the range of ISO MC3 to MC4.
Add.:Flat B, 25/F., Kin Ga Industrial Building, 9 San On St., Tuen Mun, Hong Kong. 
Tel.:(852)24407774 Fax:(852)24504446
E-mail:tungtai@tungtai.com.hk
Tungtai Bearings (International) Ltd.
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