GB77-85(DIN913)内六角平端紧定螺钉GB78-85(DIN914)内六角锥端紧定螺钉GB79-85(DIN915)内六角圆柱端紧定螺钉GB80-85(DIN916)内六角凹端紧定螺钉DIN916内六角凹端细牙紧定螺钉DIN916内六角凹端不锈钢紧定螺钉美制凹端紧定英制圆尾紧定凹端滚花紧定、美制凹端滚花紧定螺丝点滴服务,***持久,欢迎各厂商来电来函联系洽谈业务)