Pin Drive roller kelly bushings
Product Description
Function： Work with master bushing to drive drill pipe
The pin Drive roller kelly bushing provides the following advantages:
**Pulling out or putting in string can be done while rotating
**Because of its integral construction,it can not fly out and hurts you;
**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 drill pressure is accurate
| Type |
kelly size |
Rotary table |
Drive hole Dia. |
Center Distance of the Drive hole |
| mm(inch) |
mm(inch) |
mm(inch) |
mm(inch) |
| BFK-6F-B4 |
133.4(5-1/4'') |
952.5(37-1/2'') |
86.2(3-25/64'') |
654(25-3/4'') |
| When ordering or requesting quotation, if size out of above specification, pls. specify clearly. |
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