On 6 Sep 2005 14:57:22 -0700, "
wrote:

Quick question concerning the required length of coach bolts... I'm
going to build a deck using 100mm support posts with 47mm joist
connected with coach bolts. Question is should I use 150mm coach bolts
or longer? Is the 3mm left over ample to tighten the coach bolt?

By the time you add a washer under the nut there'll be a bit less bolt
available :-)

Are the post & joist dimensions you quote actual or nominal?

I would rather have a bit of bolt protruding from the nut.

--
Frank Erskine