280pcs M5-M20 Copper Flat Washers, 12 Sizes for Cars, Boats, Generators, Machines, Factory Engines

• Primary material: This set of flat washers is made of high quality copper with good electrical conductivity and thermal conductivity, melting point up to 943°C
• Functions: Flat washers can spread a load and prevent damage to the to be fixed, and insulate the steel screws from the surface, with 12 different sizes of washers in this set. Can be used as a spacer, wear pad, preload indicator, locking device and to reduce vibration
• External use: this washing machine is suitable for different engines of cars/boats/generators/machines/factory
• Instructions for use: it can be quicker to separate them using the magnet
• Practical: This set includes many flat washers that can be used for a long time, so you don't have to run to the hardware for a while

Description: The washer is a thin disc shaped plate with a hole in the middle which is normally used to distribute the load of a net attachment, such as a screw or nut. Other uses are such as a spacer, a wear pad, pre-load the indicator device, locking device and to reduce vibration. High quality bolted joints require hardened steel washers to prevent loss Pre-load after application. Washers are also important for preventing galvanic corrosion, especially by insulating steel screws from aluminium surfaces. Specifications: Material: copper. Type: flat washer. ID * OD * Thickness Quantity: M5 x 9 x 1 mm 30 pieces. M6 x 10 x 1 mm 30 pieces. M6 x 12 x 1 mm 20 pieces. M8 x 12 x 1 mm 30 pieces. M10 x 14 x 1 mm 30 pieces. M8 x 14 x 1 mm 20 pieces. M12 x 16 x 1 mm 25 pieces. M14 x 18 x 1 mm 25 pieces. M12 x 18 x 1.5 mm 20 pieces. M16 x 20 x 1.5 mm 20 pieces. M16 x 22 x 1.5 mm 15 pieces. M20 x 26 x 1.5 mm 15 pieces. Box size: 17.5 x 10 x 2.3 cm/6.89 x 3.93 x 0.9 inches. Package contents: 1 set x washers.