what size screws are used with ASA lip strike

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Lip length refers to the dimension from the centerline of the strike screw holes to the edge of the lip.  See the attached as lip length depends on door handing and thickness, Extended Lip Str...
Lip length is calculated using the following formulas:
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.
US 8-32 X 1/4 Inch length Phillips head. The same size can be used for a Torx/Security screw.
The cam screw uses a T-10 and the housing screws use a T-15 driver.