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Tricone Rock Drill Bits - Standard Connection Sizes. Size. Standard Pin Connection. Make up Torque. 3 1/2. 2 3/8 API. 4.1~4.7. 4 1/2 to 4 3/4 inch. 2 7/8 API. 6.1~7.5. 5 1/2 to 6 3/4 inch. 3 1/2 API. 9.5~12.2. 7 1/2 to 9 1/2 inch. 4 1/2 API. 16.3~21.7. 9 5/8 to 13 3/4 inch. 6 5/8 API. 38~43.4. 14 5/8 to 26 inch. 7 …
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