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TonyDuell · 13th Jul 2021, 4:17 am

I've certainly come across Bristol spline grub screws in knobs and turn-counter dials -- on British equipment. The keys to fit them are not that easy to find but they do exist.

Never seen a 3/64" Allen key though. There are even smaller ones, 28 thou and 35 thou which I do have (and have used), I have an idea that there are metric ones exactly the same size in some sets. For some odd reason, one of my tool sets contains identical 50 thou and 1.27mm Allen key blades _with different part numbers_. Go figure.

13th Jul 2021, 4:17 am	#10
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,213	Re: Imperial Allen key sizes? I've certainly come across Bristol spline grub screws in knobs and turn-counter dials -- on British equipment. The keys to fit them are not that easy to find but they do exist. Never seen a 3/64" Allen key though. There are even smaller ones, 28 thou and 35 thou which I do have (and have used), I have an idea that there are metric ones exactly the same size in some sets. For some odd reason, one of my tool sets contains identical 50 thou and 1.27mm Allen key blades _with different part numbers_. Go figure.