Material: 100% Alloy Steel Grade 10.9, and the surface is treated with black oxide. High corrosion resistance and chemical resistance. Flanged Hex Head Bolts can be widely used in household appliances, electronic products, communication products, automobiles, bicycles, furniture, ship assembly and other mechanical industries. Design: The feature of flange bolts is that there are some circular serrated flanges below their heads, which serve as gaskets to distribute the load and prevent loosening. Metric M12 Flanged Hex Head Bolts, Thread Diameter: 12mm; Thread Pitch: 1.75mm; Screw Length: 50mm. Package Included: 6 PCS M12 Flange Hexagon Head Screws. Any time you need us, please contact us via email or Q&A. We will provide you with professional service and reply to you as soon as possible, you can rest assured to buy.