Masonry Magazine May 2010 Page. 21
Drill Point Length
Drill point length varies, depending upon the screw size and point type. The lengths common in our industry are #3 point. The same size screw with a differing drill point can affect screw tension capacity as much as 10 percent less with the larger point size. Consult with the manufacturer for the appropriate size/capacity information if needed. The length of the point varies by screw size also. In a #2 point #10 screw, the drill point length can be 13/64-inch and for the #2 point #12 screw, the drill point length can be 1/2-inch. A #3 point can be up to 5/16-inch long for a #12 or 1/4-inch screw. The dimensions are relevant in order to select the proper screw length.
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Screw Size Diameter
Selecting the screw size (diameter) then becomes the next condition. The BIA recommends a minimum #10 screw be used. A #12 and 1/4-inch diameter are also capable to satisfy the working load environment. The #10 screw has a diameter of 0.190-inch and usually 16 threads per inch. A #12 screw is 0.216-inch in diameter and has 14 threads per inch as does the 1/4-inch screw size. The functional requirements of the screw selection will determine the size based on capacity demand.
Screw Size Length
The minimum length of screw required for an application is a function of:
* The tie plate thickness (can range 0.60-inch to 0.125-inch) PLUS
* The stud thickness (0.056-inch for 16-gauge) PLUS
* The sheathing thickness PLUS
* Three threads (minimum threads piercing through the steel, 3/16-inch for #10, and 1/4-inch for #12 and 1/4-inch screws) PLUS
* The Drill Point length (13/64-inch for #10, and 1/2-inch for #12) PLUS
* The sealant washer thickness (1/8-inch)
Based on these criteria, a #10 screw with a #2pt attaching to a 16-gauge tie base plate against 5/8-inch sheathing
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READER SERVICE #250 May 2010 CTP CONSTRUCTION THE PRODUCTS 7804 W Orchard Drive Michigan City, Indiana 46360-9390-USA Phone: (219) 878-1427 Contact Steve Getz, BSCE www.ctpanchors.com Proudly Made in the USA!
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