Screw classification


2023-05-29 10:02

The main categories include ordinary screws, machine screws, self tapping screws, and expansion screws.
Cap screw used to be limited to full tooth fasteners.
Hexagonal head screw Hex cap screw and large hexagonal bolt Hex bolt, as the name suggests, are externally threaded fasteners with a hexagonal head, designed to be turned with a wrench. According to the ASME B18.2.1 standard, hex cap screws have a smaller tolerance for head height and stem length compared to regular large hex bolts. Therefore, ASME B18.2.1 hex screws are suitable for installation in all areas where hex bolts can be used, as well as in areas where large hex bolts are too large to be used.
Socket cap screw, also known as socket head screw or socket head screw, is a screw with a hexagonal inner hole on the head that can only be tightened or loosened after inserting a hex key (Allen wrench or Allen key) into the inner hole. The most commonly used hexagon socket head screws are cylindrical head screws with a head diameter of approximately 1.5 times the main diameter of the thread (1960 series). Other head types include bottom head cap screws for aesthetic appearance and counter head cap screws suitable for tapered screw holes. The counterbore design allows the screw head to rotate even without being exposed to the surface of the fixed object, so it is often used in areas with small surfaces and inconvenient for traditional wrench use.
Machine screws generally have a diameter less than¼ Inch screws (4 #~12 #) are usually full teeth and rotated by a screwdriver, such as slotted, cross or hexagonal.
Wood screws, machine screws; But according to different purposes, it can be divided into many categories; Within the machine screw category, it can be divided into longitudinal fastening screws and transverse expansion screws; According to the thread, it can also be divided into:
A: Triangle thread (60 degrees): engagement/locking/expansion
B: Pipe triangular thread (55 degrees): engagement/locking 3)
C: Trapezoidal thread (30 or 29 degrees): power transmission
D: Square thread (90 degrees): power transmission
Stainless steel screws
Screws And Shafts For Motorcycle Or Bicycle
Screws And Shafts For Sewing Machine
Socket Set Screws
Stainless Steel Coat Thread Screws
Stainless Steel High Low Thread Screws
Stainless steel mechanical screw Stainless S

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