Cold-Formed Steel: Screws

To achieve the loads shown in this catalog, the Designer must verify that the self-tapping screws used have an allowable load capacity equal to or greater than those shown in the table below.

Hex head screw sizes shown are required for connectors in this catalog. Where sheathing or finishes will be applied over the screws and low profile heads are needed, such as with bracing connectors, hurricane ties, and stud-plate ties, the Designer is to ensure that the minimum screw head diameter complies with ASME B18.6.4.

#8 x 3/4"	#10 x 3/4"	#14 x 1"

The tabulated loads may be multiplied by a Factor of Safety (Ω) of 3 to determine the screw nominal strength. The LRFD load may be determined by multiplying the nominal screw load by a Resistance Factor (Φ) of 0.50.
Self-tapping screw fasteners for steel-to-steel connections used for connectors in this catalog shall be in compliance with ASTM C1513.
Values are based on cold-formed steel (CFS) members with a minimum yield strength, Fy, of 33 ksi and tensile strength, Fu of 45 ksi for 43 mils (18 ga) and thinner and a minimum yield strength of 50 ksi and tension strength of 65 ksi for 54 mils (16 ga) and thicker.
Minimum base metal thickness is based on AISI General Provisions Standard Table A5.1-1. Design thickness shall be the minimum base metal thickness divided by 0.95. Design thickness for the steel sheets are: 33 mil=0.0346", 43 mil=0.0451", 54 mil=0.0566", 68 mil = 0.0713", and 97 mil = 0.1017".
Minimum required screw length is the greater of 3/4" and the minimum length required for the screw to extend through the steel connection a minimum of (3) exposed threads per AISI General Provisions Standard Section D1.3.
Screw diameters per 2001 AISI NAS Commentary Table C-E4-1.
1/4" self-tapping screws may be substituted for #14 screws.