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 Post subject: Allen Seat Bolt
PostPosted: Tue Dec 24, 2013 2:36 pm 
Retro Guru
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Joined: Tue Jul 17, 2012 4:41 pm
Posts: 444
Location: Moneyscalp N.Ireland
am a bit stumped and was hoping someone could advise as I'm currently rebuilding a 1960's frame that is missing its integral seatbolt (screws straight into the fastback seat cluster without the need for a nut) my question is that a 6mm is just a bit too narrow, 8mm is too big leaving me to think it must have an Imperial thread, I have tried offering a standard seat bolt to see if that screws in but that is also too big so I was wondering were these integral seat bolt threads standardised back then or is a trial and error process in trying to find the right threaded bolt? (M7 bolts don't appear to be available option)
would appreciate any help
Griff


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 Post subject: Re: Allen Seat Bolt
PostPosted: Tue Dec 24, 2013 3:52 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
Posts: 9314
Location: Cumbria
Back in the 70's we had to go back to the builder or try and find a suitable bolt as quite a few were different. SABA did some titanium replacements and another (who's name escapes me) did a range of stainless steel ones.

I wonder if Ceeway does them ?

Shaun


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 Post subject: Re: Allen Seat Bolt
PostPosted: Tue Dec 24, 2013 7:40 pm 
rider | rBoTM Winner
rider | rBoTM Winner
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Joined: Fri Jan 25, 2008 1:42 pm
Posts: 5293
Location: West Yorkshire
I know what you mean. My Dave Russell has a similar thing and I never discovered what the REAL thread was. I just found a steel cap head allen bolt of the right diameter and sort of re-tapped the frame by screwing it in and out a little bit at a time.

Not recommended, I suppose I was lucky not to completely ruin it!


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 Post subject: Re: Allen Seat Bolt
PostPosted: Tue Dec 24, 2013 8:24 pm 
rBoTM Winner
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Joined: Wed Dec 12, 2012 10:18 pm
Posts: 2364
Location: California
Maybe if you have the binder professionally tapped? Very old frames with long gone standards and fittings can be the most frustrating part of a quality restore. Which is why I am so pleased when a frame comes with the proprietary bits in place. Just try sorting a seat binder for a 50s Legnano.


Steven


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 Post subject: Re: Allen Seat Bolt
PostPosted: Tue Dec 24, 2013 8:48 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
Posts: 9314
Location: Cumbria
Just had a look on the ceeway site, can't see them but would be worth an e-mail :) i wonder if the thread is the same as a brake centre bolt? Might have to re-tap to a modern metric size as mentioned

shaun


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 Post subject: Re: Allen Seat Bolt
PostPosted: Tue Dec 24, 2013 9:37 pm 
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Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1513
Location: Cotswolds
My best guess is 1/4 inch BSF, 26 TPI. The tapping size is 5.5mm, if you happen to have a 5.5mm drill it should just go through the hole to check the size.
A 6mm x 1 would be a very loose fit, but would feel it was going in.
Keith


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