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Imperial Thread of KEF Bolts

 
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neddy
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Joined: 08 May 2010
Posts: 8
Location: dublin

PostPosted: Wed Apr 24, 2013 4:00 pm    Post subject: Imperial Thread of KEF Bolts Reply with quote

I assume that the bolts and nuts used in KEF speakers of the 1970's were
imperial and used British Standard Fine (BSF) as a screw thread form. Can anyone please confirm this ? Thanks
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speakerguru
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Joined: 18 Nov 2005
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Location: Green Hut, Tovil

PostPosted: Wed Apr 24, 2013 6:54 pm    Post subject: Reply with quote

KEF were completely metric by the time I joined in June 1975. Of course that did not change the 1" and 1.25" diameter of the B200 voice coil diameters, etc. , but all the drawings and all screw threads were metric.

Side note: 2BA is extremely close to M5........
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neddy
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Location: dublin

PostPosted: Wed Apr 24, 2013 10:53 pm    Post subject: Reply with quote

Thanks speakerguru. So can I assume my KEF 105.1 use 2BA bolt/t-nut for bass baffle and midrange units and 3BA for the treble units?
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speakerguru
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PostPosted: Thu Apr 25, 2013 8:33 am    Post subject: Reply with quote

No. 3BA!! Shocked I know it exists but I've never seen one Laughing

Model 105 was completely metric. M5 and M4 for machine screws, plus various sorts of woodscrews.
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neddy
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Joined: 08 May 2010
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Location: dublin

PostPosted: Thu Apr 25, 2013 6:38 pm    Post subject: Reply with quote

Thanks speakerguru. Other bolts/nuts for my 105.1 are M4 and M5.

Regarding the bolts and t-nuts for drive unit mounting M4 and M5 do not fit as I have tried them.

The existing bolts will screw into a M4/M5 threads, albeit with a loose fit. Conversely M4/M5 bolts will just start into the existing t-nuts though seize almost immediately.

So this is why I am guessing 3BA and 2BA, same size different pitch ?? Confused
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speakerguru
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PostPosted: Thu Apr 25, 2013 7:42 pm    Post subject: Reply with quote

Model 105(.1), hmmmm. That had the B300 rear mounted on a removable baffle didn't it. That would have used speaker bolts, i.e. through bolts with woodscrew type thread nead the head (in the wood) and M5 at the end where it pops through, no? The early heads were MDF, so the B110 and T52 would have been held in by woodscrews. Have I remembered right or am I beginning to lose it?
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