2/27/15 – FUN FACT FRIDAY – How to Interpret Screw Sizes

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1. Locate the first number in the screw size to learn the diameter of the screw. For example, in the screw size 1/2-15 x 3, “1/2” means the screw’s diameter is 1/2 inch.

2. Identify the screw’s thread count by the number between the dash and the “x” in the screw size. For example, in the screw size 1/2-15 x 3, “15” means the screw has 15 threads per inch. Occasionally, this number will be omitted in favor of the abbreviation “CT” for course thread or “FT” for fine thread.

3. Determine the screw’s length by looking at the final number in the screw size. For example, in the screw size 1/2-15 x 3, “3” means the screw is 3 inches long.

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