Metric Std. Thread Length Bolts

Bolt Diameter	Standard Thread Length (mm)*	Standard Thread Length (mm)*
(mm)	Bolts 125mm and shorter	Bolts longer than 125mm
3	12	–
4	14	–
5	16	22
6	18	24
7	20	26
8	22	28
10	26	32
12	30	36
14	34	40
16	38	44
18	42	48
20	46	52

* Important note: Some bolts may vary from the standard thread length.