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|Material:||Stainless Steel||Head Style:||Pan Head|
|Drive Type:||Phillips Slot Drive||Standard:||DIN|
|Thread Type:||Tapping Thread||Finish:||Plain|
Stainless steel phillips slot pan head self tapping screw ST4.2*38
Self-tapping screws have a wide range of tip and thread patterns, and are available with almost any possible screw head design. Common features are the screw thread covering the whole length of the screw from tip to head and a pronounced thread hard enough for the intended substrate, often case-hardened.
For hard substrates such as metal or hard plastics, the self-tapping ability is often created by cutting a gap in the continuity of the thread on the screw, generating a flute and cutting edge similar to those on a tap. Thus, whereas a regular machine screw cannot tap its own hole in a metal substrate, a self-tapping one can (within reasonable limits of substrate hardness and depth).
Raw Material:Stainless steel
As we all know, stainless steel’s resistance to corrosion and staining, low maintenance, and familiar lustre make it an ideal material for many applications.
Stainless steel differs from carbon steel due to the presence of chromium. Unprotected carbon steel rusts readily when exposed to the combination of air and moisture.In comparison, stainless steels contain sufficient chromium to undergo passivation, spontaneously forming a microscopically thin inert surface film of chromium oxide by reaction with the oxygen in air and even the small amount of dissolved oxygen in water. This passive film prevents further corrosion by blocking oxygen diffusion to the steel surface and thus prevents corrosion from spreading into the bulk of the metal.
Self-Tapping Screws: How to Choose Them
What material is involved can help determine what type of self-tapping screw will work best. There are two types: thread-forming and thread-cutting. Thread-forming screws are usually used when working with plastics. Thread-forming screws are designed to stay in place tightly, but over tightening the screw could result in materials breaking under too much pressure. Thread-cutting screws are used mostly when working with metal and wood. One drawback to using thread-cutting screws is that the threads may strip if the application is disassembled. This prevents reuse of the fastener and requires a new, slightly larger self-tapping screw when it is time to reassemble.
However, there is a solution to prevent stripping. A metal insert can be installed from the beginning that would allow the self-tapping screw to be regularly fastened and unfastened. These metal inserts also work to help minimize stress and expand as the fastener is screwed in.
Q: Are you trading company or manufacturer ?
A: We have our own factory, which is located in Ningbo, Zhejiang. Both design team & manufacture team will support our products.
Q: What’s your main products? Can customize or not?
A: Our main products are screws.
Q: Do you provide samples? Is it free or extra?
A: Yes, we could offer the sample for free charge if we stock, but do not pay the cost of freight.
If you are interested in self tapping screw, Please do not hesitate to email us or call us. Our professional team will assit you to purchased the quality products.