spring washer 1)Size:M6-M30 2)Standard:DIN,BS,ASTM,JIS 3)Material:carbon steel 4)G.r:4.6,4.8,6.8,8.8 ... spring washer1 ... ,JIS3)Material:carbon steel4)G.r:4.6,4.8,6.8,8.85)Surface:plain,black,zinc plated,hot-galvanized6)Packing:bulk ... .Thanks!!!Tel:+86-15132040901, +86-310-6889158Tel: +86-310-6888669 spring washer