用螺纹联接并起紧固作用的零件称为螺纹紧固件。常用的螺纹紧固件有螺栓、双头螺柱、螺钉、螺母、垫圈等。
Parts with threads used for joining and fastening are called screw fasteners. The most widely used components as screw fasteners are bolts, double screw bolts, screws, nuts, washers.
翼缘法兰螺栓应为双头螺栓，螺纹为全长型，内径600 mm或以下的法兰的螺栓至少为m 16，内径600 mm以上的法兰的螺栓至少为m 20。
Girth flange bolting shall be of stud bolt type, threaded full length, and at least M16 for flange of 600 mm and smaller inside diameter and at least M20 for over 600 mm inside diameter flange.
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