Shouldered metric slotted round head screws, defined in the DIN 923 standard published by the German Institute for Standardization (DIN), are slotted drive pan head (raised cheese head) machine screws with a smooth shoulder directly under the head. Head and shoulders have a larger diameter than the toothed part. This unique design makes them ideal for maintaining alignment in component assembly as well as acting as shafts for swivel bushings and bearings. Shoulder slotted round head screws are generally produced from stainless steel, with diameters ranging from M2 to M10 and lengths up to 25 mm.
The requirements in the DIN 923 standard are under the following headings:
Pan head screws are often used to fasten metal components such as machinery and automotive parts, and accessories such as license plates and headlights. In general, pan head screws typically have a Phillips-style slotted head, but other types of sockets are also manufactured. These screws are used to hold machines together and provide certain functions. For example, pan head screws are preferred to create electro-hydraulic servo valves used to control hydraulic fluids in various industrial machinery. Pan head screws are also produced with unique or uncommon features. For example, vented screws have a hollow core through the center of the screw to expel excess gas from certain types of machinery.
Pan head screws are typically manufactured using stainless steel, carbon steel and alloy steel for better wear and tear. It is produced in a wide variety of strengths, sizes and lengths. Many existing coating methods are applied, such as black phosphate to combat corrosion and zinc for galvanization.
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