Jim Stewart wrote:
Tim Wescott wrote:
On 11/18/2010 09:37 AM, Andre Majorel wrote:
Assuming no counterbore and space is not a problem, how do you
choose between hex head and hex socket head ?

I've noticed that hex head screws are commonly available up to
property class 8.8 while hex socket head screws go up to 12.9.
Why is that ?

Socket head screws are higher tech, and look more impressive. All the
racers will think better of you if you use socket head screws
_everywhere_.

But you'll have to get some wrenches, 'cause vice-grips don't work as
well on socket-head screws.

What Tim said. And SHCS's require far less tool
clearance. BTW, If you want to get the full specified
strength from a SHCS boltup, be sure to do the little
chamfer where the through hole opens up into the counter-
bore. Details in Machinery's Handbook.

There are washers available that provide the same radius clearance too.

John