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The standard length for a new API drill collar is 31' shoulder to shoulder with the pin threads adding an extra 6-8 inches depending on the type of connection.

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12y ago

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What is the purpose the collar clamp?

a clamp placed tightly around a drill collar that is suspended in the rotary table by drill collar slips.


What is the purpose of the collar clamp?

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How do you make a cordless drill?

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