Flat Head Socket Cap Screws
Flat head screws go countersunk into the receiving material. This allows a smooth finished surface once the bolt or screw is in place.
U.N.R.F. Fine Thread/Class 3A Threads
145,000 psi. min. (thru 1/2" diameter)Manufactured to ASME B18.3 specifications / Heat Treated Alloy Steel
135,000 psi. min. (over 1/2" diameter)