タイトルまたは説明

1．The water circulation, Elastomer & metal-face sealed  roller bearing tricone bit .High precision bearing with two thrust faces. Ball lock the cone. Hard faced head bearing surface. Cone bearing inlaid with friction-reducing alloy and then silver-plated.

2．SY/T********0 and API Spec**1 standard and ISO ***1:***8 SYSTEM;

3．Multiple gauge protection with gauge trimmers on the heel of cone, tungsten carbide inserts and hard facing on the shirttail extend gauge holding capability and bearing life

4．Used for a  variety of applicable formations for water well and oilfield

5. The size  range from 3 7/8  to *2.