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DIN 934 Hex Nut M3 M20 Grade 8 Carbon Steel Plain Finish High Strength Mechanical Nut Standard Fastener, Find Details and Price about Nut Fastener from DIN 934 Hex Nut M3 M20 Grade 8 Carbon Steel Plain Finish High Strength Mechanical Nut Standard Fastener - Handan Chang Lan Fastener Manufacturing Co., Ltd.