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Seat post binder bolt w/10mm head?

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Seat post binder bolt w/10mm head?

Old 03-05-19, 03:45 PM
  #1  
gearbasher
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Seat post binder bolt w/10mm head?

I'm working on a frame and the seat lug has a recess for the binder bolt.


I have a number of binder bolts. Campy, Simplex, Tange, Sugino and unbranded. All of them measure 12 to 12.5 mm heads.
I need one with a 10 mm head in order for it to fit the recess. When looking on-line, no place gives that measurement. Can anyone give me a brand with that size? Or, if anyone has one that size, are you willing to swap for one of mine?
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Old 03-05-19, 04:09 PM
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If it's a vintage frame, you might be looking for the wrong type of bolt. How about something like this?

EDIT: first pic now showing, my suggestion is off-target.



Disclaimer: I can't see your first pic, so I may be missing vital information.
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Old 03-05-19, 05:27 PM
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I might try using a dremel tool on the bolt or nut.

Is the lug also keyed so the keyed nut will stop when tightening the bolt? Or is that an additional problem to consider?

I recently used jb weld on a nut that wasn't keyed, so I could avoid the need for two tools to tighten the bolt.
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Old 03-05-19, 06:08 PM
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I forgot to say, it's not keyed. I don't mind using two Allens to tighten it up.
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Old 03-05-19, 09:03 PM
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Seems like 8mm is common.
https://problemsolversbike.com/produ..._bolts_-_29451

You could contact these guys and check OD.
https://framebuildersupply.com/colle...t-binder-bolts

Appears they are out there.
https://www.ebay.com/itm/Campagnolo-...oAAOSwAvpbrjE7
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Old 03-05-19, 09:05 PM
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Those are the barrel sizes not the head sizes. Thanks anyhow.
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Old 03-05-19, 09:43 PM
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The screw is just a standard M6 socket head. The nut you might be able to improvise. Check the link below.

Univega Super Strada
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Old 03-06-19, 07:32 AM
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^^^^ That's an idea, but it's not gonna be pretty enough for me. I'm in no rush and will hunt around some more.
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Old 03-06-19, 09:31 AM
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I just had an epiphany. A recessed brake nut's head fits perfectly. Two of those, slightly trimmed down with a stud epoxied into one of them...done....homemade seatpost binder bolt. Any negative thoughts?
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Old 03-06-19, 10:20 AM
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Originally Posted by gearbasher View Post
I just had an epiphany. A recessed brake nut's head fits perfectly. Two of those, slightly trimmed down with a stud epoxied into one of them...done....homemade seatpost binder bolt. Any negative thoughts?
If that doesn't work out I can grind one of your 12 or 12.5mm bolts to 10mm for you.I am a tool grinder with my own shop, it's what I do! I wouldn't charge anything , just helping a fellow KOF .Let me know, Joe
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Old 03-06-19, 10:50 AM
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Originally Posted by Kabuki12 View Post
If that doesn't work out I can grind one of your 12 or 12.5mm bolts to 10mm for you.I am a tool grinder with my own shop, it's what I do! I wouldn't charge anything , just helping a fellow KOF .Let me know, Joe
Thanks for the offer. That was going to be my last-ditch-effort plan. The main drawback being the removal of the chrome and rusting.
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Old 03-06-19, 10:53 AM
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Most are 8, ( that's shaft diameter not head ) , but for the all aluminum AlAn , they used a 10*, even Campagnolo offered one, .. stock one not as shiny..

*chain ring bolts are also 10 mm shaft
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Old 12-25-20, 02:17 PM
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gearbasher Curious what you ended up doing.... I just acquited a SOMEC frame and i've run into the same problem! Not sure what to do. It looks so much better when I put in a brake bolt and it sits inside...
My campy one just sits on top. looks terrible. did you figure out a solution with something that fits into the brake bolt with the same size diameter? or were you able to put 2 together as you said? What would have to be done in my situation if i was to try that would be trimming the barrel length down. brake bolts do come in shorter sizes sometimes but the only one i have that's extra definitely takes up more than half the clamp length. I dont know what to do!
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Old 12-25-20, 02:34 PM
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I took two recessed style brake nuts. I cut a threaded section off a bolt and threaded it into one of the brake nuts with epoxy (to keep it from spinning). Let the epoxy cure. I put that on one side and threaded the other brake bolt on. I use two allen keys to tighten it down. You just have to get the right size brake nuts (or file them shorter) so they don't bottom out.

Basically, description in post #9

Hope my description is clear, I've been using it for over a year with no problems.

Last edited by gearbasher; 12-25-20 at 02:37 PM.
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Old 12-25-20, 02:44 PM
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Originally Posted by gearbasher View Post
I took two recessed style brake nuts. I cut a threaded section off a bolt and threaded it into one of the brake nuts with epoxy (to keep it from spinning). Let the epoxy cure. I put that on one side and threaded the other brake bolt on. I use two allen keys to tighten it down. You just have to get the right size brake nuts (or file them shorter) so they don't bottom out.

Basically, description in post #9

Hope my description is clear, I've been using it for over a year with no problems.

Yeah that's an option! There's gotta be something that's out there that will fit! damn. so crazy
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Old 12-25-20, 04:48 PM
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Also interested because I am in the same boat with my SR frame its got to be 10mm max diameter to fit the recess and look clean.
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Old 12-25-20, 07:32 PM
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See this thread. Maybe I can help you.

FYI: DIY seatpost binder nut for 80s Japanese frames
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Old 12-26-20, 03:28 AM
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I am pretty sure that you need a splined, rather than a keyed, seat post binder bolt. Pretty sure that I have a couple at the lake cottage. Will look next time I go there, if you wish.
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Old 12-26-20, 03:37 AM
  #19  
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What's the other side look like/need.

It'd be dead simple to turn a stainless socket-head or button-head capscrew to 9.9mm, can I assume the hole dia is 8mm.
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