SHIATZY CHEN Xia Zi Chen spring and summer 2015 pleated skirt series, still follow the brand's beloved senior Wugan yarn design, soft package looming exquisite curves, while the clever hip expansion design more wonderful Man waist. Yu Tianyi with plain white shirt with SHATIZY CHEN Xiazi Chen 2015 spring and summer Haiping line series pink pleated skirt of the tour Tianyi, in the halo under the pure like an angel. The rainbow-colored pink stitching flickers with the wind and becomes the crowning touch. In order to emphasize the overall dress, she specifically with a pair of dark single shoes, personally demonstrated the super-collaborator supermodel skills. Wang Shiqing dressed in SHIATZY CHEN Xiazi Chen 2015 spring Xia Haiping line series sky blue mosaic pleated skirt, macarons as sweet sky blue, coupled with a black Slim shirt, in the early summer street with a smile of joy and laughter are smart Like a fairy, wearing such a beautiful dress, the mood will become clear! 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. stainless steel self tapping screws, pan head self tapping screws, flat head self tapping screws FinExpress Precision Manufacturing(Dongguan) Co., Ltd , https://www.finexpresshardware.com
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.
August 23, 2021