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).

For softer substrates such as wood or soft plastics, the self-tapping ability can come simply from a tip that tapers to a gimlet point (in which no flute is needed). Like the tip of a nail or gimlet, such a point forms the hole by displacement of the surrounding material rather than any chip-forming drilling/cutting/evacuating action.

Not all self-tapping screws have a sharp tip. The type B tip is blunt and intended for use with a pilot hole, often in sheet materials. The lack of a sharp tip is helpful for packaging and handling and in some applications may be helpful for reducing the clearance necessary on the reverse of a fastened panel or for making more thread available on a given length screw.

Advantages
One-stop shopping; • professional and experienced engineers and strict QC and QA system • response within 24 hours
Have passed the quality authentication • large stock for standard size
Timely delivery • Supply Material and Test Reports;
Samples for free
Surface Treatment
Zinc plated, Nickle plated, Chrome plated, Passivation, Oxidation, Anodization, Black Oxide, Phosphatizing, Power Coating and Eletrophoresis, etc
Processing Equipment：
cold heading machine, threading machine, CNC machining center, CNC lathe, automatic lathe machine, conventional lathe machine, milling machine, drilling machine, grinding machine, etc




Certification:

ISO9001:2000, CE, RoHS,

Delivery,shipping & Serving：

Lead time: 5 working days for sample , 30 working days for bulk order.

Shipping: Ocean , Air, Express ( UPS , FEDEX, DHL, TNT)

Packing details：

Bulk packed in the 25kgs knited bags, then in Wooden cases.




FAQ

Q: Can you offer me sample?
A: Yes, we can offer you sample to test and check quality.

Q: How does your factory do regarding quality control?
A: We have professional QC team to inspect each items from the links of production to package.

Q: How about your delivery time?
A: Normally it will take 5-35 days after receiving your deposit.

Q: What is your payment term?
A: T/T,Western Union,L/C,and Paypal.This is negotiable.

Q: What is the shipping method?
A: It could be shipped by sea,by air or by express(EMS,UPS,DHL,TNT,FEDEX and ect).Please confirm with us before placing orders.