Fastener Parts Introduction There are two main features of Hex Socket Head SEMS Screws with Flat, one is a hexagon socket and the other is a flat head. Hexagon socket screws, as the name suggests, have six surfaces, which also means that they have more surface area and therefore they can withstand more load forces.The design of the flat head is similar to the countersunk head screws, which can embed the nail head in the machine part, which increases the connection strength and ensures the aesthetics of the surface of the machine part. Our products have various specifications and surface treatment, you can choose the one you need or contact us for customization. Features 1. The products are galvanized to improve the corrosion resistance, making their appearance more beautiful and the colour more uniform. 2. The head of the screws can sink completely without affecting the appearance of the parts or scratching the hands. 3. The rotating threads make connection firmer. And the threads are neat and clear without defect. Product Details 鈼?Product Type: Screws/Bolts 鈼?Product Name: Hex Socket Head SEMS Screws With Flat 鈼?Size: M3-M14; #0-#12;1/4-9/16;ST2.9-ST9.5; Special size can be enquired and supported 鈼?Product Executive Standards: ANSI, DIN, ISO, GB;or Per customer's drawing 鈼?System of Measurement: Metric/Inch 鈼?Head type: Hex Socket Head 鈼?Material: Low carbon steel / medium carbon steel / alloy steel 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锛?/p Case harden-- Surface hardness min450HV core hardness 270 ~ 390HV/290~370HV 鈼?Support non-standard customization 鈼?Country of Origin: China Applications Our advantage Customized--We are the manufacturer! sample OEMODM are available! Safety--We have own test chart, all of our products have been rigorously tested in the factory. Certification--We have CE and quality management system certification. High Quality --Our company uses the most advanced equipment to make the best quality products.Fastener Parts website:http://www.junlyhardwaresupply.com/fastener-parts/