Indented hexagon head with collar hi lo thread screws

Steel weld stud fully threaded

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.

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.

a) This bolt features an external hexalobular socket with a small flange, and is designed for applications requiring a high torque transfer with reduced risk of cam-out. 

b) The star-shaped head allows for great torque transfer by distributing the load more evenly across the drive, compared to traditional drive systems like Phillips, Pozi or slotted.

a) A weld screw is a fastener specifically designed for welding onto metal surfaces, particularly steel. It is coated with a thin layer of copper, which enhances conductivity and improves weld quality by ensuring a strong and consistent bond.

a) A self-drilling screw is a type of screw designed to drill its own hole and tap its own threads into materials as it is driven in, eliminating the need for a pre-drilled hole. The screw features a drill-like tip, often referred to a self-drilling tip, which helps the screw cut through the material. This makes installation faster and more efficient. 

b) Serrations under head create additional friction between screw head and the material. The serrated surface provides better grip for tools like screwdrivers, allowing more torque to be applied during installation.