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Boyer coil mounting

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Boyer coil mounting

Posted by robert_tuck at January 17. 2017

I have a double ended coil to fit to the Atlas that came without fixings. The mounts are threaded but I have been unable to match them,not sure if they are 1/4 bsf or1/4 unf ,any idea?.

Re: Boyer coil mounting

Posted by Bob Matthews at January 17. 2017

I take it you have tried threading known bolt sizes into the coil?  I believe that when I fitted one to my BSA, it had metric M6 threads, so maybe that's the problem.

Re: Boyer coil mounting

Posted by richard_evans at January 17. 2017

1/4 UNF are 28 TPI

1/4 BSF are 26 TPI

1/4 Cycle are 26 TPI

Try M6 for a match they are common enough

Re: Boyer coil mounting

Posted by robert_tuck at January 18. 2017

Nope, m6 pass through, may be m7.  Tried about 10 taps so far.I will see if Boyers know .____ Not a thread at all,though it looks like one. through bolts with ally sleeves needed to conduct the heat away to a sink,comes as a kit.If not used expect the coil to expire.

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