Re: Torx sizes

On 28 Sep, 20:26, "LADmachining (AB)" <LADmachining@*sky*sky.com>
wrote:
Cheshire Steve wrote:
I have found more horrible Torx cap head screws - big ones for which I
don't have a key. I don't understand the sizing - the biggest I have
in my set is T40 - which are 6.5mm across between points - so how the
heck are they sized ? 40 what, gnats crotchets ? I suppose I will have
to buy some more bits, but I need to measure these so I buy big
enough.

Ta, Steve

From my experience, the size of the Torx bit relates to the thread size
as follows:-

Thread size (M) = Torx number / 5

Example: T30/5 = M6
T40/5 = M8

HTH

Anthony
Remove stars and a sky to reply.

Thanks,

Not much use when you have to find a tool to remove them, its a bit
tricky to measure the thread first !

So is this some new international measure - a fifth of a millimetre !
Another reason to consign every Torx I ever see to the bin. I have now
found the blasted things in bolt-head form on my Calibra - they are
springing up everywhere. I have BSF, BSW, AF, Metric, BA sockets,
spanners, allen keys, 3 different types of cross-head screws and god
knows what else - do we really need whole new sets of head types ?

But, ta anyway.
Steve

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