In the DIN 7516 standard published by the German Standardization Institute (DIN), the dimensions and requirements of cross countersunk head thread cutting screws are defined and test methods are explained.
In the mentioned standard, the requirements for cross countersunk thread cutting screws are listed under the following headings:
Cross countersunk thread cutting screws are threaded fasteners with a machine thread that will cut itself when driven into a threadless pilot hole. Cross countersunk threaded shear screws have a cross countersunk driven head that can be operated with a Phillips screwdriver. These screws create some chips as they are driven into a threadless hole that will be pushed forward. Metric thread cutting screws generally require less torque than thread forming screws and can be used in applications where the required torque for thread forming screws is not desired. When installed correctly, countersunk threaded shear screws provide a tight fit with the mating part and do not normally require the use of a lock washer to prevent it from coming loose.
Essentially, this standard defines three types of cross countersunk threaded shear screws:
Cross countersunk flat head, cross countersunk oval head or cross countersunk pan head threaded shear screws are threaded fasteners with a machine thread that will cut its own thread as it is driven into a threadless pilot hole.
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