For many Americans, the metric system is confusing and difficult to use. But the good news is that the metric Hexagon Flange Bolt follows a clear formula in its naming convention.
Metric fasteners are named using diameter, pitch and length. Let's look at an example of how to disassemble the name of the fastener to understand its characteristics.
Fastener name: M12-1.25 x 20
M indicates that the measured value of the fastener is in metric system.
12 tells you the diameter in millimeters.
1.25 explains the distance between threads, also called pitch.
20 Tells you the length of the fastener (in millimeters).
To determine the thickness of a metric fastener, you should know that as the number becomes larger, the pitch becomes thicker. These different degrees of roughness can be used for different purposes.
For example, thicker fasteners are commonly used as automotive parts, while finer-pitch fasteners are more common in sanitary ware.
Convert metric pitch to threads per inch
People who are accustomed to using imperial fasteners may be confused when switching to metric. That's because inch fasteners explain how many threads the fastener has per inch, not the space between threads.
But you can easily convert the pitch of metric Threaded Rods And Eye Bolts to know the number of threads per inch. This is the formula you will follow.
Convert the pitch from millimeters to inches by multiplying the pitch by 0.03937.
Divide 1 by the number you got in step 1.