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a) DIN 965 specifies the standard for countersunk head screws with a cross recess drive (commonly known as a Phillips drive). These screws are designed to sit flush with the material’s surface when installed, ensuring a smooth and clean appearance.
b) The cross-recessed drives, such as Phillips and Pozi, are widely used for their ease of installation and removal with compatible screwdrivers. Additionally, the hexalobular socket (6-lobe) design is commonly employed to provide improved torque transfer and minimize the risk of cam-out during fastening.
DIN 6922 outlines the dimensions and technical specifications for hexagon flange bolts featuring a reduced shank. These bolts are characterized by a flange, a disc-shaped extension beneath the head, serving as an integrated washer. The inclusion of the flange enhances the bearing surface, facilitating load distribution, particularly advantageous in specific applications. Dog point with truncated cone end.
a) Unlike DIN 912, DIN 7984 screws features a low-profile head and a hexagonal socket drive (Socket thin head cap screws) with metric thread ranging from size M3 to M24
b) DIN 7984 screws have a thinner head because they are designed to be countersunk, allowing them to sit flush with the material surface. However, this design may not provide the same torque transfer capacity as the thicker head of DIN 912 screws, which are designed to handle higher torque due to their thicker cylindrical head shape.