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Thread cutting screws are tapping screws that have cutting flutes or edges at their point so that when driven into a preformed hole the screw acts as a tap and actually cuts its own mating thread. This therefore removes material as it is driven.
Hole Sizes for Thread Cutting Screws
InStock Fasteners' selection of thread cutting screws features five primary point styles:
A thread cutting screw with machine screw thread with blunt tapered point, having multi-cutting edges and chip cavities. For heavy gauge sheet metal, aluminum, zinc, and lead die castings, cast iron, brass and plastic.
Formerly known as the Type 25, the type BT is a thread cutting screw in the fine thread series offering maximum thread cutting area and excellent chip clearing, with minimum tightening torques. For plastics and other soft materials with large chip clearing and cutting edges. It is the most common standard thread cutting screw due to its wide thread spacing and generous cutting slot.
Type 23 :
Also known as Type T, Type 23 screws have machine screw threads with a blunt point and tapered entering edges, with one or more cutting edges and chip removal indentations. In this sense they are similar to Type F screws. The cutting edge on the point, however, is broader and deeper than that of the Type F.
A thread cutting screw especially for wood, with a coarse tapping screw thread and a special long sharp point fluted to capture chips.
Essentially a Teks screw point, on thread cutting screws the Type 3 point reduces tapping torque and the tendency to strip out in thicker materials.