Products class 1、SAE J429(GRDE 2,5,8) ASTM A307(GR AB) ASTM A325(TYPE 1) 2、DIN(GRADE 4.8-10.9) 3、 ISO(GRADE 4.6-10.9including 4014,4017,4016,4018) 4、 BS
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Products class 1、SAE J429(GRDE 2,5,8) ASTM A307(GR AB) ASTM A325(TYPE 1) 2、DIN(GRADE 4.8-10.9) 3、 ISO(GRADE 4.6-10.9including 4014,4017,4016,4018) 4、 BS