I just picked up some Leupold bases
From the back of the Leupold package;
6-48 Base screws 22 in/lbs
8-40 Base screws 28 in/lbs
8-40 Ring screws 28 in/lbs
STD windage screws 45 in/lbs
Ringmount keeper screws 45 in/lbs
PRW keeper screws 22 in/lbs
Mark 41/2 keeper screws 65 in/lbs