Author Topic: Very small spanners  (Read 792 times)

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Offline MikeWilliams

Very small spanners
« on: July 02, 2017, 08:43:51 PM »
I recently purchased an engine without outside valvegear and the return crank is fixed onto its square with small screws and nuts which measure c2.2mm a/f.  One has come loose.  Any suggestions where to find or how best to make a spanner or spinner of that size?  I will have no idea what the thread is, until I can get it off.

The set of pseudo BA spinners I have are actually metric and neither 2mm nor 2.5mm will hold.
 
Mike

Offline IanT

Re: Very small spanners
« Reply #1 on: July 02, 2017, 10:07:50 PM »
I think it's most likely a 12BA nut Mike - which should be 0.090" (2.286mm) across flats. You could open the 2mm spanner 'out' a little maybe? Sounds like your spanners might be a bit undersized for BA. The 2.5mm spanner could be enlarged slightly to 0.103" A/F (for BA11 nuts - not a common size) or to 0.114" for BA10.

Regards,

IanT   
Nothing's ever Easy - At least the first time around.

Offline IanT

Re: Very small spanners
« Reply #2 on: July 02, 2017, 10:25:37 PM »
The socket size of a 4BA capscrew is 3/32" (or it should be) if you have one Mike - 3/32" being 0.09375" - a few thou larger than you need but still between your 2.0 & 2.5mm "pseudo" BA spanners...

Regards,

IanT
Nothing's ever Easy - At least the first time around.

Offline Geoff Nicholls

Re: Very small spanners
« Reply #3 on: July 03, 2017, 08:00:51 AM »
Geoff.

Offline Jon Nazareth

Re: Very small spanners
« Reply #4 on: July 03, 2017, 08:43:05 AM »
Roxey Mouldings sell some very nice nut spinners.

Jon