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Hexalobular (6 Lobe) socket pan head machine screws, ISO 14583

Machine screw with round head and Torx grip in strength class 4.8 Zinc-plated FZB, stainless A2 and acid-resistant A4. 

d1M1,6M2M2,5M3M4M5M6M8
d2 max3.2455.689.51216
k max1.31.62.12.43.13.74.66
t max 0.771.041.271.661.912.423.18
a ∼ 1.752.42.83.954.55.67.95
Bit No.T5T6T8T10T20T25T30T45