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Allen Key size

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Tony Martyr	19/03/2013 14:51:06
226 forum posts 45 photos	I thought I had every allen-key known to man under 1/2" but I am currently defeated by one for tightening a set of 6BA grub-screws. Can anyone help with the size? I am assuming they would be an imperial size but my sets don't seem to include the correct one. Tony
JasonB	19/03/2013 15:04:46
25215 forum posts 3105 photos 1 articles	0.050" J
Andyf	19/03/2013 18:43:58
392 forum posts	I think 1.25mm is the smallest common metric Allen key, and would probably substitute for 0.05". 1.25mm = 0.0492", so less than 1 thou undersize. Andy. Edited By Andyf on 19/03/2013 18:44:36
David Littlewood	19/03/2013 18:45:03
533 forum posts	If you have trouble finding one, you can get them (at a price!) from Slater's Plastikard; they are the standard size for fixing Slater's wheels on to O gauge locos. LINK I'm sure you could find them cheaper somewhere else though. David
Michael Cox 1	19/03/2013 18:51:49
555 forum posts 27 photos	Model Fixings (www.modelfixings.co.uk) stock 0.05" hex keys. Mike
JasonB	19/03/2013 18:52:57
25215 forum posts 3105 photos 1 articles	Can't see why you would want to buy a metric substitute taht won't fit so well when 50thou keys are readily available Try EKP, MSC, GS Supplies, Reeves, Bruce, Model Fixings etc J&L/MSC are probably the cheapest with decent Eklind ones costing 9p
Ian Abbott	19/03/2013 18:55:42
279 forum posts 21 photos	Grind a larger one down to size Ian
Andrew Johnston	19/03/2013 18:59:56
7061 forum posts 719 photos	There's nothing to say that the 6BA grub screws have a standard size hex hole, depending upon their provenance. Regards, Andrew
JasonB	19/03/2013 19:10:57
25215 forum posts 3105 photos 1 articles	Well I suppose we have to assume they are made to BS 2470 just as we would have to assume all other fixings are to the relevant british standard.

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