What is the coarse nut?

Coarse nuts is greater than the standard teeth from the pitch of the nut is the thick nut, what is the standard ? As follows:

M2*0.4

M3*0.5

M4*0.7

M5*0.8

M6*1.0

M8*1.25

M10*1.5

All of the above is the standard thread, when the tooth diameter to ensure the same, tooth pitch change larger, it is called coarse teeth, such as M6 * 1.0 to M6 * 1.5 or M6 * 2.0 that is non-standard teeth distance . Usually those nuts have to customized.

Why do we want to customize?

As we all know,the standard nut are easily imitated by others,but non-standard nut will not.And then,the non-standard nut will be better to meet customer requirements.