If you want to understand how to determine a bolt or nut thread size then you need to read this article by RCF Bolt & Nut.
Bolt Size Chart Bolt Dimensions, Thread, How to measure Bolt Size?
Hillman 5/16-in x 4-in Zinc-plated Coarse Thread Interior Carriage Bolt in the Carriage Bolts department at
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Cyrco Inc. showcases FRP bushings for maximizing composite structural integrity
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Bolt Size Chart Bolt Dimensions, Thread, How to measure Bolt Size?
Bolt Size Chart Bolt Dimensions, Thread, How to measure Bolt Size?
SC-45125-2 - Screw 4.5 x 125 mm (0.177 x 4.92 in) for plastic plug - Lifetime Connectivity