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2550 S 27th Avenue
Broadview, IL 60155 

W6331 Bee Rd 
Watertown, WI 53098 

Lock Washers
3704 N Palmer Rd 
Milwaukee, WI 53212 

W6331 Bee Rd 
Watertown, WI 53098 

Thread-Cutting Screws

thread cut 160px wide
Thread Cutting Dimensions (PDF)
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Thread Cutting Screws - For Plastic and Other Low Density Materials

Another Shakeproof invention, the thread cutting screws utilize an off-center shank slot to provide a true cutting action. There are several types depending on the application.


  • Eliminates the need for a separate tapping operation
  • Generates a perfectly formed mating thread providing a stronger joint
  • Reusable with continuous performance
  • Thread cutting feature can be designed into other screws


  • Type 1- recommended for steel parts having a thickness less than half of the screw diameter.
  • Type 23- have a wider shank slot and are recommended for use in cast iron and soft metals such as zinc and aluminum castings.
  • Type 25- combines a wide thread cutting shank slot and acute cutting edge with spaced threads for a low drive to strip ratio and is best for thermoset plastic.
  • Type 17- drills its own hole and cuts close mating threads in wood, light plastics, and particle board.

Thread Cutting Chart 1

Thread Cutting Chart 2

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