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SpiderMonkey Posted - 03/30/2019 : 14:43:20
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?

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SpiderMonkey Posted - 03/31/2019 : 06:39:08
Woot! Also known as "Chicago Screws" according to boltdepot.com.

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

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

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


Garrie "carbon based lifeform" Hill
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SpiderMonkey Posted - 03/30/2019 : 16:41:12
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!

alevand Posted - 03/30/2019 : 16:10:32
Is it like the nut that hold the v-brake pads on?

Tony Levand

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