Screw Category

Screw Category

    Has a head screws Cap screw fasteners in the past limited to all teeth, but this is not the standard usage.

Hex cap screw Hexagon head screws with large hexagon head bolt Hex bolt for the definition of the outer hexagonal screw-type fastener, is designed to use the wrench turning. In accordance with ASME B18.2.1 standard, hexagon head screws (Hex cap screw) More generally, the large hexagon bolts (Hex bolt) head height and arm length tolerance is small, so ASME B18.2.1 hex bolts for installation on all hex bolts that can be used places, also contains large hexagon bolts are too big and can not use the place.

Hexagon head screws Socket cap screw also known as Wotou screws or Allen bolts (Allen bolt), is a hexagonal head screw inside the hole to 6 Square (hex key, Allen wrench or Allen key) into the hole before tightening or loosening. Hexagon screws most commonly used is the cylinder head bolts, head diameter is about 1.5 times the diameter of the main thread (1960 Series), other head shape including the surface appearance of the semicircle head screws (Bottom head cap screw) and apply to conical screw holes flat-head screws (Countersunk head cap screw). Shen-hole design allows the screw heads do not need to be exposed at the surface of a fixed object can also rotate, and therefore make more use of the surface of a smaller, traditional wrenches inconvenient to use place.

Machine Screw Machine screw diameter of generally less than ¼-inch screws (4 # ~ 12 #), usually for the whole tooth and Yukiko rotation, such as the word slot, cross or internal hexagon and so on.