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  1. sharafe

    UN TPI for large holes

    Hello, I'm trying to find out: 1. When to use UN and when to use UNC in a drawing. 2. How to determine the UN threads per inch designation for holes greater than 6 inches as in the Machinery's Handbook 27th Ed. Specifically, I have a hole that is 7.5" and want to know what TPI would make it...

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