top Screw Shear and Tension Loads

1. Screws have been tested per AISI Standard Test Method TS-04. The tabulated ASD loads are based on the screw average ultimate strength with a factor of safety (Ω = 3.0) as determined per 2001 AISI NASPEC Supplement section E4.
2. Use the member connection allowable load tables for connection design.

topCold-Formed Steel Member Connection Loads

For reference, see steel mil / gauge conversion table below.

1. Screws and screw connections have been tested per AISI Standard Test Method TS-4 and TS-5.
2. The tabulated ASD allowable loads for cold-formed steel (CFS) members are based on the lower of the screw strength or the strength of the screw in the connected members per 2001 AISI NASPEC & 2004 NASPEC Supplement section E4.
3. The safety factor is based on AISI NASPEC Chapter F for tested connections.
4. The average ultimate values listed are achieved under laboratory conditions and should not be used for design loads.
5. Values are based on cold-formed steel (CFS) members with a minimum yield strength of Fy=33 ksi and tensile strength of Fu=45 ksi for 43 mil (18 ga) to 33 mil (20 ga), minimum yield strength of Fy=50 ksi and Fu=65 ksi for 54 mils (16 ga) to 97 mill (12 ga), and a minimum yield strength of Fy=36 ksi and Fu=58 ksi for 1/8" and thicker.
6. For design purposes, steel sheet thicknesses are 0.0346" for 33 mil, 0.0451" for 43 mil, 0.0566" for 54 mil, 0.0713" for 68 mil, and 0.1017" for 97 mil. The actual sheet thickness shall not be less than 95% of these design thickness as specified in AISI/COS/NASPEC 2001 AISI Standard section A2.4.
7. Screw diameters per 2004 AISI General Provisions Commentary Table D1-1.
8. Minimum required screw length is the lesser of 3/4" or the minimum length required for the screw to extend through the steel connection a minimum of 3 exposed threads per 2004 AISI General Provisions Standard section D1.3.
9. Washer diameter, d_w for #10 and #12 screws is 0.375" min.
10. The allowable load (ASD) values showing are not permitted to be increased for short-duration loads such as wind or earthquake loads.
11. The lower of the pull-over and pull-out allowable load should be used for tension design.
12. Not applicable for XQ78S1224.
13. The tabulated shear values are based on the thinner steel member in the connection. Steel thickness for both members must be in the range of the 1/4"-20 gauge.

topSteel Thickness

1. One "mil" is 1/1000 (.001) of an inch. Mil thickness measures the uncoated based material.
2. Minimum thickness is based on ASTM A6-07 permitting under design thickness by 0.01".