The main categories include ordinary screws, machine screws, self tapping screws and expansion screws three kinds.
Head screws cap screw used to be limited to full tooth fasteners. Hexagon head screws hex cap screw with large hex bolts hex Bolt, as its name suggests, is a six-angled external threaded fastener designed to rotate with a wrench. According to the ASME B18.2.1 Standard, the head height and rod length tolerances of the hexagon head screws (Hex cap screw) are smaller than the normal large hex bolts (Hex Bolt), so the ASME
The B18.2.1 hexagon screws are suitable for installation at all hex bolts where they can be used, as well as large hex bolts that are too large to be used. Hexagon head screws Socket cap Screw, also known as head screw or, is a screw with a hexagon-shaped inner hole in the skull that can be tightened or loosened by inserting a six square (hex key,allen wrench or Allen key) into the inner hole. Hexagon screws are most commonly used with cylindrical head screws, with a head diameter of about 1.5 times times the main diameter of the thread (1960 series), and other head types include a round head screw that makes the surface look good (Bottom heads cap screw) and a grub screw for tapered screw holes (countersunk heads cap Screw).
The sinking hole design allows the screw head not to be exposed in the fixed object surface also can rotate, therefore uses in the surface to be small, the traditional plate hand inconvenient use place.
Machine screws machine screw generally the screws (4#~12#) with a diameter of less than ¼, usually full teeth and rotated by a screwdriver, such as slotted, cross or hexagon.
Wood screws, machine screws; however, according to different uses can be divided into a number of categories; machine screws can be divided into longitudinal fastening screws and transverse expansion screws, according to the thread can also be divided into:
A: Triangular thread (60 degrees): Binding/locking/expansion
B: Pipe screws (55 degrees): Binding/Locking 3)
C: trapezoidal thread (or 29 degrees): Power transmission D: Square thread (90 degrees): power transmission
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