pwhole said:
but I'll wait for sinker to get home first
I still don't have time to fully expand. I'll let the thread run it's course, but again, PLEASE don't use concrete bolts.
They'll be fine for a couple of years then they'll get forgotten about. Next thing some future explorer will come along and rig off them and fall to his death.
With ANY LUCK he would put a spanner on it first and check the tightness. Then when he nipped it up the head would shear off (which is what happens with them) before it was rigged.
The torsional stress in those bolts is unbelievable. If the hole is a few microns too tight, due to a bit of residual dust or slightly worn drill bit, then the torque applied can put so much torsional stress into the bolt that the end of the thread is 1/4 of a revolution behind the head. This is why the heads snap off them. Torsional stress and stretch. look carefully at the shank under the head and the casting where the thread stops and the shank starts. the ALWAYS shear off in either of those two locations.
Final point, although I could go on all day, I have yet to see any of this type of bolt (Hilti / Fischer / Ankabolt etc etc) where the manufacturer actually states that they are suitable for suspending a human being on.
That final point is all you need to know.
As a Temporary Works Designer / Co-ordinator I can sort out all sorts of temporary works designs which use this type of bolt for holding down shutters, hand rails (in a load-share situation), soffits etc but in the last 20 years since their widescale introduction I have yet to see a design which approves them for use in suspending a human being in an access, fall restraint or fall arrest situation.