Screws are a common term for fasteners, which are threaded fasteners with various structural shapes, screws including screws, bolts, studs... Wait a minute.
Screws are classified according to the head type, which can be divided into: plate head, round head, cylindrical head, countersunk head, flat round head, semi-sink head, semi-round head, hexagonal head, spherical cylindrical head...
Different types of screws have their corresponding standards, the same screw head shape has a screw head type comparison table, and the screw slot type has a slot type comparison table.
From the figure, it is more intuitive, and there are many types of screw slots, common one-word slots, cross slots, hexagons, and less common H-shaped, triangular, Y-shaped and other types of slots.
wall insert bolt胀管螺钉
butterfly nut元宝螺母
stud bolt双头螺杆
countersunk bolt 平头螺钉
round head bolt 圆头螺钉
cap nut 奶头螺母
hex。socket head cap bolt内六方螺钉
