Undefined Tool Joint Measurements

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Undefined Tool Joint Measurements

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Often we come across undefined tool joints. The thread identification is normally stamped on the tool joint. If that stamp is worn or is not present you need specific information to determine the tool joint identification. The way to define the pin tool joint (The box tool joint is hard to measure and measurement has often lead to errors) is to measure:

A. The diameter of the base of the pin where it meets the sub body (shoulder).
B. The thread length. Measured from shoulder to the end of the tool joint.
C. The number of threads per inch - put the 0 mark of a ruler on the center
of the first thread, don't count that thread, then count the threads to the one inch mark (see sketch).
D. The thread form (taper, square, acme, special, etc.)
E. The material O.D. - this may differ within threads, but is a cross check.

Your free thread ruler is at the beginning of this catalog. It will assist you in determining the thread. If you need additional copies, please contact your sales representative.

If there are problems measuring the part, send it to our engineers who can match the tool joint with one of over 600 thread gages we have in stock or in the API reference books.