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Seat Binder Bolt (9mm Hex) for '85 Fuji Opus III

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Seat Binder Bolt (9mm Hex) for '85 Fuji Opus III

Old 02-10-21, 11:13 AM
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Seat Binder Bolt (9mm Hex) for '85 Fuji Opus III

Does anyone have an extra or know where I can get a 9mm, flat-to-flat, hex nut. I think it's M6?

I can't find many out there. They seem pretty obscure, especially the OEM part with sleeve.

Someone recommended having a machine shop turn down a 10mm hex nut to 9mm, or using a 3/8 (which is 9.53), I think it would be too big. Or using a washer under an 8mm or similar hex nut. This seems less than ideal to me.

I'm using an acorn bolt now - also less than ideal, since it doesn't feel like steel, or very strong. I had an old steel 9mm hex nut but it was also less than ideal being quite thin.

I think 5mm thick would be ideal for the hex lug side as well as for the round bolt side, which also seems to be 9mm diameter.

Asked similar here:
'85 Fuji Opus III Seatpost Questions

Thanks for any other suggestions!

Last edited by specialmonkey; 02-10-21 at 11:18 AM.
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