Button head security screws hex socket drive + pin

Safety screw with rounded head, inside hexagon and safety pin, ~ISO 7380.
Used together with hex keys DIN 911 PIN

d1M4M5M6M8
d2 max7.69.510.514
k max2.22.753.34.4
s2.5345
t min1.31.562.082.6
d3 max1.11.31.62

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