pin drive roller kelly bushing

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pin drive roller kelly bushing
Posting date : Jun 21, 2008
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82-
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the pin drive roller kelly bushing provides the following advantages: 1. pulling out or feeding off string can be done while rotating; 2. because fo its integral construction , it can not fly out and hurts you, 3. the bushing is easily installed into the master bushing, maintaining good alignment the contact between kelly and roller is rolling contact, so friction is lower, and weight on bit is accurate. msn xiaoyouloveyou@hotmail.com

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