what size through bolts can be used

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LCN does not supply Allen wrenches, the size that LCN uses, are standard sizes that every installer will have in their tool kit. 3/32" Allen wrench for adjusting regulation valves: main speed, lat...
The cam screw uses a T-10 and the housing screws use a T-15 driver.
Steelcraft follows the industry standards for hinge reinforcement and preparation for both door and frame. Unless otherwise specified all products prepared for butt hinges will have mounting holes ...
A 4040 closer mounted with thru bolts on a 2-3/4" thick door would require 1/4-20 X 3-1/2" machine screws.