Dimensions for all thread sizes and their corresponding class of fit can be found in the ASME B1.1 Specification.
All fastener threads have five defining dimensions, they are the major diameter, minor diameter, pitch diameter, flank angle and pitch.
A fastener with a machine screw thread can have one of three thread tolerances, they are “Class 1”, “Class 2”, and “Class 3”. To indicate that a thread is a male thread an “A“ is placed behind the Class of Fit number for example 2A.
To indicate that a thread is a female thread a “B” is used, for example, 3B. This class of fit is used on more critical applications.
We have an obligation to demand more for our investment.
And if our investment fails, we have an obligation to spend our resources in more productive ways. law dating back to 1995, and it’s position has been repeatedly endorsed by the American people ever since.
See “Threads” on page 9 to see all the various sheet metal threads.