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DIN931 Carbon Steel Grade 10.9 Structural Heavy Hexagon Head Bolt with Half Thread Dacromet Finish for Wind Power Generation Pylon, Find Details and Price about Bolt DIN931 from DIN931 Carbon Steel Grade 10.9 Structural Heavy Hexagon Head Bolt with Half Thread Dacromet Finish for Wind Power Generation Pylon - Ningbo Weiwu Industrial Equipment Co., Ltd.