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This sounds like an easy question, but the answer depends on which type of thread call-out you are trying to read.

There are multiple types of screw threads and each has its own call-out; but many are similar in syntax.

The most common screw thread style in the USA is the UN-series. These screw threads are specified in ANSI/ASME B.1.

An example of a UN-series thread call-out is:

1/4"-20 UNC-2A

Decoded it is:

Nominal Major Diameter (1/4")-Threads-per-inch (20) Type of thread (UN) Sub-thread-series (C)-Class-of-fit (2A)

An example of the M-series thread call-out is:

M16x1.5-6g

Decoded it is:

Type of thread (M) Nominal major diameter (16) Thread pitch (1.5) class-of-fit (6g)

For more detailed information here is a link to a nice PDF book which gives very clear basic information on screw threads: http://www.ring-plug-thread-gages.com/ti_starret.pdf.

I do hope that you found this information helpful.

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