Use a thread cutting screw in materials where the internal stress caused by the point would be disruptive or undesirable. The slots and flutes of the thread cutting screw will reduce required tightening torque. They are recommended for use in materials that would otherwise require excessive torque to tighten screw down.

The following styles are various THREAD CUTTING screws.

Look for spaced threads which taper and lead to a blunt point. There are multiple cutting slots and chip cavities running up the tapered area. Threads may be complete or incomplete at the manufacturer's option.
Recognized by the spaced incomplete and tapered threads leading to a blunt point with a flute cut out at the tip. For use in ABS plastic, fiberglass, nylons and other softer materials.
Threads are machine screw style tapering to a blunt point. A cutting slot runs up the tapered end. For use in aluminum, zinc and lead die-castings, sheets or shapes but ca be used in iron, brass and plastics also. Also known as Type "D".
Recognized by the machine screw threads which may be complete or incomplete at the manufacturer's option. Multiple cutting slots lead to a tapered blunt point. For use in aluminum, zinc, lead, brass, iron die-castings, and more rigid plastics.
Similar to Type 1 with machine screw threads leading to a blunt point are characteristic or this screw. The point has a slot completely through the diameter of the screw for good thread cutting and chip clearing. Use in same materials as Type 1.
Similar to the Type 25 except having a machine screw thread. The blunt point has a flute for maximum thread cutting and chip clearing. Also known at Type "T".

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