Robinson Racing Pinion screw.

[phil633]

Robinson Racing Pinion grub screw size I guess its imperial can anyone tell me what size allen key I need.Thanks. I am in the UK.

 

[Soldat Vaillant]

it's not Imperial, it's SAE or standard if it's not metric and they're either 4-40 (.050" driver) or 5-40 (1/16" driver). Robinson uses both depending on which pinion you have.

 

[2500hdon37s]

Most likely 1/16, sure bets the heck out of 1.5mm in terms of stripping reaistance.