How to Read a Screw Thread Callout
Look for a label with the callout printed on it.. Use the first number to figure out the diameter of the threads.. Read the second number to find the number of threads per inch.
Steps
Look for a label with the callout printed on it.
Look for a label with the callout printed on it.
Use the first number to figure out the diameter of the threads.
Use the first number to figure out the diameter of the threads.
Read the second number to find the number of threads per inch.
Read the second number to find the number of threads per inch.
Use the abbreviation to determine the thread standard if it is listed.
Use the abbreviation to determine the thread standard if it is listed.
Look for a number from 1 to 3 indicating the tolerance class.
Look for a number from 1 to 3 indicating the tolerance class.
Note if the screw has an LH for left-handed.
Note if the screw has an LH for left-handed.
Use the final number to determine the screw's length.
Use the final number to determine the screw's length.
Find the screw thread callout number.
Find the screw thread callout number.
Note that the letter "M" means you have a metric screw.
Note that the letter "M" means you have a metric screw.
Look at the first number to find the screw's diameter.
Look at the first number to find the screw's diameter.
Read the next number to figure out the screw's pitch.
Read the next number to figure out the screw's pitch.
Use the last number to determine the length of the screw.
Use the last number to determine the length of the screw.
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