With the development of the medical technology, nowadays there are many designs of dental drills available, however, each have the same basic features, including turbine, a handpiece, couplings, and a drill bit. The high speed drilling is activated by an air turbine. These devices convert highly pressurized air into the mechanical energy, enabling drill bits to rotate over 300,000 to 450,000 rpm.

The drill bit, is the most important part of the dental drill. It is short and highly durable, able to withstand high speed rotation and the heat that… Read the rest

1.Reliable durability:
Due to complicate inner structure and precise components, most multimedia products are labelled with “Handle with care” and “Guard against damp”. There also are strict standards applied on the matches among the components. Therefore, the product maintenance usually requires very professional equipments, and normally costs much. For example, IBM commercial harddisk need to go through hundreds of physical performance tests before launching, like out dropping, shocking, vibrating, pressuring and other extremely strict investigations. Such processing and analysing significantly enhance the products’ capability to survive in an extremely terrible… Read the rest

Basic Part No. Dimension Basic Load ratings Limiting Speed
Open Metric (mm) Cr (KN) Cor (KN) Grease Oil
d D D2 max B B1
618/2 2 5 - 1.5 2.3 0.165 0.050 85,000 120,000
628/2 5 - 2 2.5 0.187 0.058 85,000 100,000
638/2 5 - 2.3 2.3 0.169 0.050 85,000 100,000
619/2 6 - 2.3 3 0.330 0.098 75,000

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Specification

Angular Contact Ball Series
No. MODE DIMENSIONS(mm) Cage Material RPM(1000R/M)
d D B
1 B76/4.5/P4 4.5 8.5 2.5 Phenolic/Textolite 20-60
2 B76/4.5/YA/P4 4.5 8 2.5 Phenolic/Textolite 20-60
3 B76/9/P4 9 22 8 Phenolic/Textolite 20-60
4 705/P4 5 14 5 Phenolic/Textolite 20-60
5 706/P4 6 17 6 Phenolic/Textolite 20-60
6 707/P4 7 19 6 Phenolic/Textolite 20-60
7 708/P4 8

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Inch Series – Dental Handpiece Bearings / Radial Play

Single row deep groove high speed series:

Bearing Model Dimension Ball Complement Basic Load ratings Limited Speed
Basic P/N Type Metric (mm) / Inch No. Dia. (mm) Cr(KN) Cor(KN) Oil Open, Z
d D B Ds Df Bs Bf Be
R144 open 3.175mm / 0.125″ 6.35 /0.25 2.38/0.094 - - - - - 7

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