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Thread size

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Thread size

Post  kerabo on Mon Nov 05, 2018 11:19 am

Can anyone tell me the BA size of a bolt I need. My vernieris only scaled in 1 1/10" in imperial but the size is exactly 3mm.
Assuming it's BA and from a dip switch from 1936.

Thanks Ken
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BA thread

Post  piston 197 on Mon Nov 05, 2018 12:35 pm

There is not a BA thread which has a diameter of 3mm ??
5BA is 3.2mm with 43.1 Threads per inch
6BA is 2.8mm with 47.85 Threads per inch

so guessing it is one of these if it is indeed BA and not a 3mm screw which would measure 3mm ? which are available in two pitch forms
3mm x .5mm pitch
3mm x .35mm pitch

JH
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Thread size.

Post  kerabo on Mon Nov 05, 2018 6:47 pm

Thanks John I will try 5ba as its as close as anything.

Ken
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Re: Thread size

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