The values listed are ultimate
averages derived under independent laboratory conditions and apply to
screws manufactured and distributed by IFG only. Minimum industry standard
safety factor of 2.5 to 1 apply.
manufactured from cold heading quality steel complying with ASTM A548,
The installed screw
must protrude through and beyond the metal member a minimum of three full
threads. The distance from the center of a screw to the end or edge of a
metal member shall not be less than three times the screw diameter. Steel
members shall conform to section 2230, A3 of the code.25ga, 20ga, 18ga-ASTM
A653 grade 33 S.Q. with a minimum of 33,000 psi yield strength.
16ga,14ga,12ga-ASTM A653 grade 50 S.Q. with a minimum of 50,000 psi yield