![]() ![]() A 1/4 UNF thread is about 14% stronger than its UNC counterpart. See the loading charts below to see typical differences between the tensile strength of a fine vs coarse thread. This is because the smaller fine threads take up less of the available area. Screws with fine threads are slightly stronger.Coarse threads are less likely to cross-thread, or jam because the screw is inserted at an angle.Coarse threads are more common, and more shops will have coarse taps.Coarse theads have fewer threads per inch than fine threads.Other types and their purposes are described at the end of this section.Ĭoarse or Fine? To oversimplify, use a coarse thread unless you’re tapping into sheet metal. The most common thread types are the inch-based Unified coarse / fine (UNC/UNF) and metric coarse / fine. ![]()
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