Shenzhen Chuanggu screw specializing in the production of Phillips pan head combination screws, round head three combination screw factory direct wholesale price. As a flashlight manufacturer and wholesaler, we have many years of experience in producing and developing flashlights. 90% of our products are exported, and we have established partnerships with Wal-Mart, ALDI and other large supermarket chains, and we also supply to various professional outdoor tool companies, such as SBI, Carl Kammerling, etc. Our customers are all over Europe and America, and We are also slowly developing products for the Asian, African and Latin American markets. Led Torch,Led Plastic Torch,Plastic Handle Torch,Plastic Led Solar Torch Cangnan Younglite Electrical Co., Ltd. , https://www.younglitelight.com
The cross recessed pan head combination screw, also known as the cross recessed round head combination screw, or the cross recessed semicircular head combination screw, also has a name, the national standard is called the cross recessed pan head screw, the spring washer and the flat washer combination. Pieces. According to the national standard, there are two kinds of national standards. Of course, here we refer to the three-combination screw, the national standard for the combination of the pan head, and the national standard. There are two types of cross-counter combination screws, the national standard is GB9074. 8. The other is a cross recessed large pan head combination screw, the national standard number is GB9074.4. The difference between them is the size of the pan head screw. 
Our company is a professional manufacturer of combined screws. It is quite familiar with the technical conditions for the manufacture of some combined screws and is more professional. The following creative combination screw manager Zhu introduced the technical requirements of the cross recessed pan head combination screw. See what specific technical requirements are there. Stainless steel " target=_blank> stainless steel Phillips pan head combination screw" alt="" src="http://i.bosscdn.com/blog/1-/12/10/262249204D.jpg" />
The screw size in the cross recessed pan head combination screw is GB818. The main technical requirements are as follows: the material requirements are iron and stainless steel "target=_blank> stainless steel, iron has low, medium and high carbon steel, The stainless steel "target=_blank> stainless steel combination screw is made of stainless steel "target=_blank>stainless steel 201, stainless steel" target=_blank>stainless steel 304 and stainless steel" target=_blank>stainless steel 316, etc. The thread tolerance is 6G, the combination of iron The mechanical performance grade of the screw is 4.8 and 8.8. The 4.8-class combination screw is ordinary steel, and the maximum hardness is 255HV. The 8.8-class combination screw is usually made of wire 10B21 pier, and then hardened and hardened. After the treatment, the hydrogen is removed. The hydrogen removal is to prevent the brittle pad in the combination screw from hydrogen embrittlement. The spring washer is prevented from being broken. The tolerance of the combination screw is A. The cross groove is H-shaped. The surface treatment of the combination screw is environmentally friendly. Environmentally friendly. Specially, environmentally friendly blue zinc, environmentally friendly color zinc, black zinc, color zinc, white nickel, etc. The technical requirement of the combination screw for the flat washer is that the washer should be able to rotate automatically without falling off. 
The above side is the combination of the solid screw and the technical requirements of the cross recessed pan head combination screw. For more technical conditions, please consult the fastener manual. Where are the more comprehensive technical requirements. You can also call us to find out. Everyone knows that good good combination screws need to pass the stop gauge. So when we order the combination screw on the market, after ordering it back, or when the supplier sends a sample to come over, it is necessary to see if the thread of the combination screw can pass the stop gauge. If the regulation is not passed, That means that the quality is not so good, but also can explain a problem, that is, when using the combination screw, the screw wire used is not so good, the quality is not so good, the screw wire material is not so good, the screw wire material is not so good.
Thank you for visiting our website for creating screws [http://]. If you have any questions about screws and screws, you can call us and we will do our best to provide you with quality service. If you have a reprint, please bring us the website. Thank you! Http://news.chinawj.com.cn 
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn