Question

Type of thread length and limiting

Answer 1

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Thread Limit is a standard notation system indicating a level of tolerance for the thread outside the basic thread size of the tap. ... The difference in size from one H limit to the next is 0.0005″ increments for taps through 1″ diameter. Sizes over 1″ diameter are separated by . 001″ diameter increments

six

Explanation:

Six Most Common Types of Threads

However, threads and connections are divided into six main types UN/UNF, NPT/NPTF, BSPP (BSP, parallel), BSPT (BSP, tapered), metric parallel, and metric tapered