Large-head metric slotted pan head screws, defined in the DIN 921 standard published by the German Institute for Standardization (DIN), have a pan-style head (cheese head) with a significantly larger diameter than the standard pan/cheese head. Big The head screw is typically used in applications where an extra weight bearing surface under the head is required to provide a more even distribution of clamping forces. The larger diameter also eliminates the need for a washer and is very useful when the size of the hole in which the screw is inserted is significantly larger than the diameter of the screw. Large head slotted round head screws are manufactured in stainless steel in lengths up to 25 mm and diameters ranging from M2 to M8.
The requirements in the DIN 921 standard are under the following headings:
Large slotted pan head machine screws are threaded fasteners with a large diameter, round head and a slot for a flat head screwdriver. These screws are generally used in panels that are removed frequently, and it is undesirable to use thumbscrews or ordinary round head screws. Large-head slotted pan head screws are generally produced from zinc-plated steel and stainless steel.
Stainless steels for large-head slotted pan-head screws are divided into three groups: austenitic, ferritic, and martensitic. Austenitic steel is by far the most common type (more than 90 percent of commercial fasteners). Steel groups and strength classes are indicated with four-digit letters and numbers as shown in the table in the standard. The DIN EN ISO 3506 standard contains the requirements for screws and nuts made of stainless steel.
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