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What are thread-cutting screw tips?

 
         
  Screw with a thread cutting tip  

A screw with a thread-cutting tip cuts its own thread in material when being driven in.

 

It does this by cutting through the material, and removing a small amount, rather than pushing against it.

 
         
   

Advantages

 

Disadvantages

  • No stress on the screw from material that’s been pushed out of the way

 

  • Removing or installing a thread-cutting screw multiple times may cause it to cut multiple sets of threads in the material, which could overlap and ruin the hole, preventing the screw from being driven in again

  • Unlike a thread-forming screw, a thread-cutting screw interrupts the grain structure, making the joint slightly weaker

 
         
  Wonkee Donkee says "Please note: Screws with this type of point may still require a pilot hole"  
         
     

What are the different types of thread-cutting tip?

 
  Screw with a type 17 thread cutting tip  

Type 17

A type 17 tip is long and pointed with a sharp cutting flute to capture chips.

 
         
  Silver wood and gold decking screws  

Type 17 tips are usually found on wood and decking screws.

 
         
  Type F thread cutting screw tip  

Type F

A type F tip is slightly tapered with a flat end.

 

Along the side of the tip are sharp, thread-cutting edges and chip cavities to collect waste material.

 
         
  A sheet of brass and zinc  

These kinds of tips are usually used in materials such as heavy gauge sheet metal, zinc, aluminium, brass and plastic.

 
         
  Two types of machine screw  

Type F tips are usually found on machine screws

 
         
  Type 25 thread-cutting screw tip  

Type 25

A type 25 tip has a flat end but with several cutting edges around the sides and a flute for chip clearance.

 
         
  Screw with type 25 tip  

This type of tip is usually found on machine screws.

 
         

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