Q:

What are standard thread sizes in the U.S.?

A:

Quick Answer

There are around 23 to 27 standard screw thread sizes in the United States. The 0 gauge has a major diameter of 0.06 inches with 80 threads per inch in the Unified National Fine series, the 1 gauge has a major diameter of 0.07 inches with 64 threads per inch in the Unified National Course series and the 2 gauge has a major diameter of 0.08 inches with 56 threads per inch in the UNC series.

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Full Answer

The 3 gauge has a major diameter of 0.09 inches with 48 threads per inch in the UNC series, the 4 gauge has a major diameter of 0.11 inches with 40 threads per inch and the 5 gauge has a major diameter of 0.12 inches with 40 threads per inch. The 6, 8, 10 and 12 gauges have major diameters of 0.13, 0.16, 0.19 and 0.21 inches with 32, 32, 24 and 24 threads per inch, respectively, in the UNC series.

The United States uses the Unified Thread Standard to define the standard thread form and series of screw threads, including the allowances, tolerances and designations. The United States also use UTS as the main standard for nuts, bolts and other threaded fasteners. UTS uses the same 60-degree profile used in the ISO metric screw thread, but the dimensions of each UTS thread, such as the diameter and pitch, are represented in inches rather than millimeters.

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