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 Name those nuts!
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SpiderMonkey
recumbent enthusiast

USA
473 Posts

Posted - 03/30/2019 :  14:43:20  Show Profile  Reply with Quote
On this nifty carbon fiber stem I got from China (https://www.aliexpress.com/item/2017-full-carbon-fiber-riser-mountain-bike-road-bike-bicycle-stem-carbon-fiber-new-arrival-ultra/32786685828.html) the steerer pincher screws don't thread into nuts set into the CF, but into nuts that are socket hex heads. The screws are M5s, and the screw side takes a 4mm hex as normal, and on the other side, there's a socket head that takes a 5mm hex head -- so it's like M6 size. But it's a nut, looks like a stubby M6 screw, but smooth outside and M5 threaded inside.



I find this a nice way to do these, and was trying to find these for purchase, since they'd simplify a lot of my building, but I can't figure out what they're called. They're not the same as hollow "Allen nuts" (and McMaster didn't have those in metric sizes). Anyone seen these around?

--SpiderMonkey

Edited by - SpiderMonkey on 03/30/2019 19:18:06

alevand
human power expert

USA
3432 Posts

Posted - 03/30/2019 :  16:10:32  Show Profile  Visit alevand's Homepage  Reply with Quote
Is it like the nut that hold the v-brake pads on?

C:
Tony Levand
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SpiderMonkey
recumbent enthusiast

USA
473 Posts

Posted - 03/30/2019 :  16:41:12  Show Profile  Reply with Quote
No, that's more like an allen nut. But those would work OK for M6 use, and there are always spares of those in the hardware drawers. Hmmm.

These have a hex socket head on them. I'll get a photo tonight. I've never seen them before, but there's a lot of stuff I don't know!

--SpiderMonkey

Edited by - SpiderMonkey on 03/30/2019 16:42:43
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Garrie L Hill
human power supergeek

USA
1785 Posts

Posted - 03/30/2019 :  20:58:10  Show Profile  Reply with Quote
You have one of the myriad variations of a “sex bolt”. If you are over 14 years old, no explanation is necessary ;-)

https://www1.mcmaster.com/sex-bolts

Garrie "carbon based lifeform" Hill
HPRA Co-Dictator of the East
for pics of some of my time and money sucking projects
http://s58.photobucket.com/albums/g277/cfbb/
and videos
http://vimeo.com/5513519


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Terry
New Member

Canada
57 Posts

Posted - 03/30/2019 :  22:32:26  Show Profile  Reply with Quote
I'll be darned, I've never been there but I thought those were called “Texas Screws”

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SpiderMonkey
recumbent enthusiast

USA
473 Posts

Posted - 03/31/2019 :  06:39:08  Show Profile  Reply with Quote
Woot! Also known as "Chicago Screws" according to boltdepot.com.

A search for metric sex bolts turns up many unclickable links.

--SpiderMonkey
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