Drive Sizes for Star Drive Screws

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Star Drive
US Machine Screws
Diameter Drive size
#2 T8
#4 T10
#6 T15
#8 T20
#10 T25
1/4" T30
5/16" T40
3/8" T45
Star Drive
Metric Machine Screws
Diameter Drive size
2mm T6
2.5mm T8
3mm T10
4mm T20
5mm T25
6mm T30