I am using m12x1.5 which are 20mm in length for
attaching my engine mount.

Bolt( cap screw ) charts which have been helpful for
me in the past:

http://www.boltdepot.com/fastener-information/Measuring/Metric-Thread-Pitch.aspx
http://www.mcmaster.com/param/html/aboutcapscrewthread/


-Scott


       
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