Specifications High-concerned chemical:None Dimensions:M3*16 DIY Supplies:Metalworking Model Number:M4x20/30/40/50mm Material:Stainless Steel Origin: China p{margin-block-start: 0; margin-block-end: 0} Material : Made of high-quality 304 stainless steel with excellent corrosion resistance. It can be used for a long time in complex environments such as humidity, acid, alkali, etc., without rusting, ensuring connection stability. Suitable for electronic products, household appliances, communication products, locks, lighting fixtures, toys, cars, bicycles, furniture, etc. [Standard Hexagonal Head Type]: Strictly following the standard hexagonal design, the head has different edges and corners. Using tools such as wrenches and sockets is very convenient for operation, with a larger contact area and greater torque force, making it easy to quickly tighten and disassemble, and improving installation efficiency. Size M4 x 20mm 30mm 40mm 50mm, hexagonal head bolt and nut, 4 different sizes can meet your different needs. Thread diameter: 4 millimeters; Head diameter: 7 millimeters; Head height: 2.8 millimeters; Pitch size: 0.7 millimeters; Color: Silver. M4 304 hex screws have a complete range of specifications and can be widely used in various fields such as mechanical equipment manufacturing, furniture assembly, building decoration, electronic equipment, etc. They are an ideal choice for various fastening connection scenarios.