六角头螺栓M3,4,5,6,8,10,12

Explanation :
Hex head bolts were modeled by size. The length frequently used for each type of diameter of the screw was composed of a set. M3 5/10/15 (A/B/C), M4 6/10/15 (D/E/F), M5 10/15/20 (G/H/I), M6 10/15 /20(J/K/L), M8 10/15/20(M/O), M10 15/20/25(P/Q/R), M12 * 25/30/35(S/ T/U)
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描述：
将六角头螺栓按尺寸进行了造型。按螺纹的直径类别，由整套构成了常用的长度。M3 5/10/15(A/B/C), M4 6/10/15(D/E/F), M5 10/15/20(G/H/I), M6 10/15/20(J/K/L), M8 10/15/20(M/O), M10 15/20/25(P/Q/R), M12 * 25/30/35(S/T/U)
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