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ZhongXiang Rubber thread (Bolt) standard Grade 8.8

06/14/2022

ZhongXiang rubber standard thread (Bolt) is Grade 8.8.The bolts above grade 8.8 (including grade 8.8) are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched + tempered), commonly known as high-strength bolts.