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In 1913, Woolley and Meredith defined them like Anthony, but gave the following dimensions: hex head cap screws up to and including 7 ⁄ 16 inch (11.1125 mm) have a head that is 3 ⁄ 16 inch (4.7625 mm) larger than the shank diameter; screws greater than 1 ⁄ 2 inch (12.7 mm) in diameter have a head that is 1 ⁄ 4 inch (6.35 mm) larger than ...
These are the parts used to fasten all of the parts together. The TETRIX MAX Robotics building system provides only Kep Nuts, but have three types of screws. Firstly, there are two lengths of 6-32 Socket Head Cap Screws, 1/2″ and 5/16″. The third type of screw is the 3/8″ Button Head Cap Screw.
The idea of a hex socket screw drive was probably conceived as early as the 1860s to the 1890s, but such screws were probably not manufactured until around 1910. Rybczynski (2000) describes a flurry of patents for alternative drive types in the 1860s to the 1890s in the U.S., [2] which are confirmed to include internal-wrenching square and triangle types (that is, square and triangular sockets ...
Head markings and properties for metric hex-head cap screws [41] Head marking Grade, material and condition Nominal size range (mm) Proof strength Yield strength, min. Tensile strength, min. Core hardness MPa ksi MPa ksi MPa ksi Class 3.6 [42] 1.6–36 180 26 190 28 330 48 B52–95 Class 4.6 Low or medium carbon steel 5–100 225 32.6 240 35
An exception to this is 4 mm hex keys, which are almost the exact same size as 5 ⁄ 32 in (3.97 mm). In many industries, this makes 4.0 mm ( 5 ⁄ 32 in) hex keys preferred for consumer products because end users can successfully use an imperial key on a metric fastener, and vice versa.
In Japan, the male sizes are often designated as DTC-20, DTC-27, DTC-40 (discontinued) and DTC-45 corresponding to a respective screw head size of 3.2 mm, 4.6 mm, 6.4 mm and 7.7 mm; with the size of the screw measured across the widest portion of the mating part of the head. The most common sizes in use for consumer electronics are DTC-20 and ...
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