Special low head screw NYLOK

a) DIN 912 (ISO 4762) refers to a standard for metric socket head cap screws, also known as cup head screws. These fasteners feature a cylindrical head with a hexagonal recess (socket) in the center, allowing them to be tightened or loosened using a hex key or Allen wrench. These screws are commonly used in various applications where a high tensile strength is required.

b) A socket head cap screw with a knurled head is a modified version of the standard DIN 912 screw, featuring a textured knurled surface around the head. This design provides additional grip for manual handling or adjustment, making it ideal for certain applications.

a) DIN 933 refers to a standard for hexagon head bolts with full threads. These bolts are commonly used in mechanical and structural applications that require high strength and reliable fastening.

b) Typically made from carbon steel, stainless steel, or alloy steel. They are available with various surface finishes, such as zinc plating, hot-dip galvanizing, or black oxide, to improve corrosion resistance and enhance durability.

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) DIN 968 specifies the standard for cross-recessed pan head tapping screws with a collar. The screws are commonly available with two types of cross recess drives: Type H (Phillips) and Type Z (Pozidriv), both designed for easy installation and removal.

b) There are two types of thread ends specified in DIN 7970 (Tapping Screws): Type C, which features a cone point, and Type F, which has a flat end.