Quote Originally Posted by Spire View Post
It aint got anything to do with the type of head. Its whether the thread runs all the way up the shaft or not. Bolt the thread runs up to the head on a screw it stops part way.

Anyone else got any sad bits of trivia they would like to share with us?
erm.. spire mate!!.. the bolt i just unscrewed from me neck.. erm... well could swear that the thread did not go all the length of it.... but when Jake me dog brings me head back... I'll have another look at the bolt....