CaJLMetalHead
Well-Known Member
I am willing to bet it is also some kind of industrial agreement to skip certain sizes to simplify design, maintenance, etc.. . for example.. 20mm.... I noticed that at least in cars and SUVs... the use of 21mm is more prevalent.. and 19mm is even more common... so I guess the logic is kind of "why use 20mm which probably has similar torque strength to a 21mm? you also see it in smaller sizes.. ... I don't think I have seen many parts using 14mm for example..
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