One very important engineering material that is being used in a variety of applications across different sectors is metric fastener. Various types of metric fastener are used by many industries such as in construction, wood working, mobile and aerospace, and electronic device production.


In this particular content however, I will specifically touch about metric thread forming screws. These are the screws used to form the material or substrate around a hole until they wrap around the screw threads. As opposed to other metric screws, they do not remove any part from the engage section.


How do thread forming screws work?


In a layman’s term, thread forming screws force the substrate or the material to mate with their threads. The process is similar to thread-cutting screws (thread cutting screw removes bits of the material) but they just deform the substrate, by bending it into a mating position without removing any of the engaged section.




  • Metal or metallic materials – they can be utilized in a number of metal materials such as tabular steel, sheet steel, non-ferrous and light metal; the can be used multiple times (repeated use).


  • Nylon and plastic – those made of non-metallic materials, including acetal, polycarbonate, PVC, and polypropylene.


  • Wood or wooden material – there are also some types that can be used specifically to wood-working, such as in furniture and in construction (e.g. M78007 – KA18X5 PT Oval Head Steel Zinc WN1412)


Some notable advantages of thread forming screws


  • It reduces driving torques
  • Enhances resistance to thread stripping
  • Improves pullout strength
  • Lessens the risk of cracking the work piece


Screw point types


  • The type C point – this is ideal for heavy sheet metal and die casting; this application requires a higher driving torque; it eliminates chips and allows replacement with standard screw in the field.
  • The type CA point – this is similar to type c; the difference is a Gimlet point. It should be noted that the locating point works better than type c, where misalignment of homes between two adjoining pieces of sheet metal is common.
  • The Lo-Driv – this is a thread forming screw in mostly coarse machine screw threads; the point and body design need low end-load for starting and low drive torque for seating. In addition, the full 360 degree body above the point gives high quality strip-to-drive ratios.
  • The tri-round – this is a thread forming screw in mostly coarse machine screw. The 3 vertexes perform a roll-forming process to form mating threads. This effectively gives a much better thread forming as opposed to the previous two types (the C and CA point). Furthermore, this type does not require a higher driving torque.


Fu Yeh is an excellent and professional screw manufacturer in the industry. We provide a variety of high quality screws including self tapping screw, chipboard screw, roofing screws, thread forming screws, self drilling screws and more. Welcome to visit our website to learn more information about screw series. Feel free to contact Fu Yeh!



Article Source:

Article Source: