ISO 7379 Hexagon Socket Head Shoulder Screw (SSB), Steel
These shoulder screws ISO 7379 are cost-saving construction elements for a wide variety of different uses, and can be used to simplify complicated designs.
The maximum tightening torque must not be defined by strength class 12.9, it is instead limited by the relatively small bearing points (shoulders) and by the recesses at the transition point from d1 to d2 and d3.
Standard deviation: the official ISO standard sheet has the following dimensions for d2 - d1
M5-6,5 / M10-13 / M20-25
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Steel, Tensile strength 1200 N/mm2,(strength class 12.9), blackened Adapter dimension d1 ground.
Hexagon socket head.
Also available in stainless steel.