Carbon Steel Hexagonal Countersunk Head Screws, Hex Socket Bolts Machine Screws, M412mm, 30pcs Jiujiuso The product is shipped based on the color or size of the main image of the product page. Head Type: Hex Socket Countersunk Head Material: 12.9 Grade High Tensile Carbon Steel Features: Good stretch resistance and corrosion resistance in many environments, easy to use and non-slip, sturdy and reliable. Usage: Screws widely used in home and office appliances, communication equipment, ship assembly and other machinery industries. Counter-sunk head machine screws allow you to drive where it doesnt. there is not enough space for the keys. Ideal for use in confined areas where the head must be flush or below the surface. When used without a nut, they can be installed in pre-formed threaded bushings for joining machine parts or of equipment. When used with nuts, they function the same as a standard bolt and can be tightened from both sides. Screws are made made of 12.9 high tensile carbon steel. The material has good resistance to stretching and corrosion in many environments, easy to use and non-slip, sturdy and reliable. Fully threaded Our screw thread is very sharp, clean and precise. And the compact wire is not easy to deform and slipped when rolling. Deep and clear hex socket heads can make your work easier. Our screws conform to the standardized metric system Note: Please allow 1-3mm errors due to manual measurement. Thank you for your understanding. Number of products: 30 pieces Colour: Black Size: M4*12