This primer is on self-drilling screws also called tech screws our number one seller self-drilling screws are often called tech screws self-tapping screws pro points bit tip screws and drill screws the most common uses for tech screws are commercial heating and air conditioning ductwork metal roofing with metal roofing a lot of times they want the screws with the heads painted which we do carports barns and pipe corrals to let’s start with the diameter of the screw think of it like a dress size the bigger the number the thicker the shank so a number 10 shank will be thicker than a number eight sometimes you won’t know what shank size you need but with the right information it’ll be pretty easy to figure that out at least with hex headed screws to help you determine the shank size of a hex headed screw. Large metal corner brackets, Metal corner brackets for wood, Heavy-duty metal corner brackets, Long metal corner brackets, Metal corner brackets Screwfix, Decorative metal corner brackets, Corner brace brackets, L brackets.
Outdoor screws Screwfix, Railway sleeper brackets, Screwfix railway sleeper brackets, Railway sleeper brackets b&q. Measure across the flat of the head of the screw it’s going to be one of three measurements quarter inch 5 16 or 3 8. unlike zipping screws tech screws have only two options for shank sizes with a quarter-inch hex head number six and number eight again number eight shanks are more popular than number six 5 16 hex drive will either be a number 10 or a number 12 Outdoor Screws shank in the heating and air conditioning industry it’ll probably be a number 10. some companies do like number 12s but 99.9 of the time they will want a number 10 shank the easiest is a 3 8 hex drive number 14 screw shank the 16 in the above example 10 10-16 by three-quarter refers to the threads per inch also referred to as to determine the length of a hex headed screw measure from underneath the head of the screw to the tip of the screw contractors will often ask for self-tapping screws.
When they want tech screws or self-drilling screws now tech screws and self-drilling screws are self-tapping but that has everything to do with the threads and nothing to do with the point of the screw when they ask for a self-tapping screw it’s extremely important that you ask them what the point of the screw looks like does it look like a drill bit tip or does it look like a needlepoint here are the two different types of points both will be called self-tappers if somebody asks for a self-tapping screw ask them.
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