Bolts and Screws factory Introduction Screws are used to connect two objects. Generally, the head of the screw will protrude from the object's surface. But the Hexagon Socket Countersunk Head Screws will not cause this problem and keep the surface flat after installation. They are often used in machinery, mainly for easy fastening, and easy disassembly, and are not easy to slip. The wrench is generally a 90-degree turning wrench. When screwing with the short side, holding the long side can save a lot of force for you and can play a good tightening role. Hexagon Socket Countersunk Head Screws will not make the surface of the parts have protrusions after installation. The parts of the fastener have two thicknesses. The so-called thick one means that the thickness of the fastener part is greater than the thickness of the head of the hexagon socket head screw. After the screw is tightened, there are still some threads that do not enter the threaded hole. In this case, the socket head cap screws can be tightened. The screw finish can be zinc plating, hot-dip galvanized, nickel, etc., and we can also follow your drawings or samples to produce non-standard hexagon socket screws. Product Details 鈼?Product Type: Bolts / Screws 鈼?Product Name:Hexagon Socket Countersunk Head Screws 鈼?Size: M3-M14; #4-#12;1/4-9/16;ST2.9-ST9.5; Special size can be enquired and supported 鈼?Product Executive Standards: ANSI, DIN, ISO, GB锛沷r Per customer鈥檚 drawing 鈼?System of Measurement: Metric/Inch 鈼?Head type: Countersunk Head 鈼?Material: Low carbon steel / medium carbon steel / high carbon steel / alloy steel/Stainless steel /Copper copper allo/Aluminium Aumium Alloy/etc. 鈼?Grade: Quenching and tempering heat treatment--4.6/4.8/5.6/5.8/6.8/8.8/9.8/10.9/12.9/Grade 5/ Grade 8 Case harden-- Surface hardness min450HV core hardness 270 ~ 390HV/290~370HV A2/A4 鈼?Support non-standard customization 鈼?Thread: Metric thread. 鈼?Thread direction: correct. 鈼?A hex wrench/hex wrench is required. Custom coating Quality control Strict contract assessment, all departments are involvedto assure the feasibility of each order. Process design and validation before bulk production. Strictly control on all raw and auxiliary materials, All raw materials reach the world advanced level. On-site inspection to all processes, inspection record keep traceable for 3 years. All inspectors are skilled with international certificates.Bolts and Screws factory website:http://www.junlyhardwaresupply.com/fastener-parts/bolts-and-screws/