# What is this bolt called? **URL:** \ **Category:** Factual Questions\ **Created:** [February 16, 2013, 6:34pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521 "2013-02-16T18:34:34Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Johnny\_L.A](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/johnny_l.a/32/1084_2.png) [@Johnny\_L.A](https://boards.straightdope.com/u/Johnny_L.A)\ **Post date:** [February 16, 2013, 6:34pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/1 "2013-02-16T18:34:34Z")
[This](http://media.midwayusa.com/productimages/880x660/primary/366/366909.jpg) happens to be a front pivot pin for a Colt AR-15 rifle. It is an ‘inside out bolt’. That is, the threads are on the inside of a smooth cylinder. It has a screw head at one end, and another screw screws into the interior threads. I’ve seen similar things for notebooks/binding punched paper. What is the proper name for this piece of hardware? ---
**Author:** ![Fubaya](https://avatars.discourse-cdn.com/v4/letter/f/c2a13f/32.png) [@Fubaya](https://boards.straightdope.com/u/Fubaya)\ **Post date:** [February 16, 2013, 6:47pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/2 "2013-02-16T18:47:11Z")
I think it’s called a binding barrel. ---
**Author:** ![Bullitt](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bullitt/32/5725_2.png) [@Bullitt](https://boards.straightdope.com/u/Bullitt)\ **Post date:** [February 16, 2013, 6:47pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/3 "2013-02-16T18:47:39Z")
[sex bolts](http://www.boltdepot.com/Sex_bolts_and_Mating_screws.aspx?gclid=CLaQsNq-u7UCFYFxQgodayoA3A) ---
**Author:** ![Bullitt](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bullitt/32/5725_2.png) [@Bullitt](https://boards.straightdope.com/u/Bullitt)\ **Post date:** [February 16, 2013, 7:09pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/4 "2013-02-16T19:09:28Z")
> [@echo7tango](#): > > [sex bolts](http://www.boltdepot.com/Sex_bolts_and_Mating_screws.aspx?gclid=CLaQsNq-u7UCFYFxQgodayoA3A) Sex bolts is a funny name. The link says they’re also called Chicago bolts. ---
**Author:** ![Johnny\_L.A](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/johnny_l.a/32/1084_2.png) [@Johnny\_L.A](https://boards.straightdope.com/u/Johnny_L.A)\ **Post date:** [February 16, 2013, 7:09pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/5 "2013-02-16T19:09:40Z")
Thanks, guys! ---
**Author:** ![GaryM](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/garym/32/241_2.png) [@GaryM](https://boards.straightdope.com/u/GaryM)\ **Post date:** [February 16, 2013, 7:10pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/6 "2013-02-16T19:10:31Z")
Yep, Chicago Screws. Used many when putting photo albums together. My ARs use pins that just slide in. Don’t have any Colts though. ---
**Author:** ![friedo](https://avatars.discourse-cdn.com/v4/letter/f/8edcca/32.png) [@friedo](https://boards.straightdope.com/u/friedo)\ **Post date:** [February 16, 2013, 7:24pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/7 "2013-02-16T19:24:10Z")
> [@echo7tango](#): > > [sex bolts](http://www.boltdepot.com/Sex_bolts_and_Mating_screws.aspx?gclid=CLaQsNq-u7UCFYFxQgodayoA3A) There’s a website called Bolt Depot? I think I just died and went to heaven. ---
**Author:** ![John\_Mace](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/john_mace/32/185_2.png) [@John\_Mace](https://boards.straightdope.com/u/John_Mace)\ **Post date:** [February 16, 2013, 7:27pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/8 "2013-02-16T19:27:54Z")
> [@friedo](#): > > There’s a website called Bolt Depot? I think I just died and went to heaven. Are you sure that’s not a gay bar in West Hollywood? ---
**Author:** ![Bullitt](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bullitt/32/5725_2.png) [@Bullitt](https://boards.straightdope.com/u/Bullitt)\ **Post date:** [February 16, 2013, 7:40pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/9 "2013-02-16T19:40:08Z")
nm ---
**Author:** ![Fubaya](https://avatars.discourse-cdn.com/v4/letter/f/c2a13f/32.png) [@Fubaya](https://boards.straightdope.com/u/Fubaya)\ **Post date:** [February 16, 2013, 8:00pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/10 "2013-02-16T20:00:29Z")
They are also apparently called architectural bolts. So pick your favorite… binding barrel/post/bolt sex bolt Chicage bolt architectural bolt ---
**Author:** ![johnpost](https://avatars.discourse-cdn.com/v4/letter/j/f17d59/32.png) [@johnpost](https://boards.straightdope.com/u/johnpost)\ **Post date:** [February 16, 2013, 8:43pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/11 "2013-02-16T20:43:32Z")
they should be called a barrel nut. ---
**Author:** ![Xema](https://avatars.discourse-cdn.com/v4/letter/x/9de053/32.png) [@Xema](https://boards.straightdope.com/u/Xema)\ **Post date:** [February 16, 2013, 8:48pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/12 "2013-02-16T20:48:59Z")
> [@johnpost](#): > > should be called a barrel nut. That’s the name I’ve heard. ---
**Author:** ![Napier](https://avatars.discourse-cdn.com/v4/letter/n/ce73a5/32.png) [@Napier](https://boards.straightdope.com/u/Napier)\ **Post date:** [February 16, 2013, 10:31pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/13 "2013-02-16T22:31:48Z")
“Sex bolt” is the only term I’ve seen for this. ---
**Author:** ![Amateur\_Barbarian](https://avatars.discourse-cdn.com/v4/letter/a/59ef9b/32.png) [@Amateur\_Barbarian](https://boards.straightdope.com/u/Amateur_Barbarian)\ **Post date:** [February 16, 2013, 11:10pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/14 "2013-02-16T23:10:21Z")
Are you sure it’s not a self-sealing stem bolt? 😃 Barrel nut and sex bolt are the two terms I’ve seen used. ---
**Author:** ![RickJay](https://avatars.discourse-cdn.com/v4/letter/r/bb73d2/32.png) [@RickJay](https://boards.straightdope.com/u/RickJay)\ **Post date:** [February 17, 2013, 1:27am UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/15 "2013-02-17T01:27:57Z")
I’m going to Home Depot tomorrow and demanding they sell me the sex bolts, ALL the sex bolts. ---
**Author:** ![MrDibble](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/mrdibble/32/114_2.png) [@MrDibble](https://boards.straightdope.com/u/MrDibble)\ **Post date:** [February 19, 2013, 10:24am UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/16 "2013-02-19T10:24:29Z")
They are _also_ also called screw posts. Just saying. ---
**Author:** ![Qwakkeddup](https://avatars.discourse-cdn.com/v4/letter/q/90ced4/32.png) [@Qwakkeddup](https://boards.straightdope.com/u/Qwakkeddup)\ **Post date:** [February 19, 2013, 1:09pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/17 "2013-02-19T13:09:36Z")
When I was introduced to them, we called them Jailhouse bolts, as the type we used were supposedly only one way. They are used to put the stall around the toilet together in public restrooms. People will steal **anything!** ---
**Author:** ![Rick](https://avatars.discourse-cdn.com/v4/letter/r/9f8e36/32.png) [@Rick](https://boards.straightdope.com/u/Rick)\ **Post date:** [February 19, 2013, 1:49pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/18 "2013-02-19T13:49:23Z")
Barrel nuts or screw posts but from now on sex bolts! ---
**Author:** ![leftfield6](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/leftfield6/32/18780_2.png) [@leftfield6](https://boards.straightdope.com/u/leftfield6)\ **Post date:** [February 19, 2013, 2:55pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/19 "2013-02-19T14:55:34Z")
> [@echo7tango](#): > > [sex bolts](http://www.boltdepot.com/Sex_bolts_and_Mating_screws.aspx?gclid=CLaQsNq-u7UCFYFxQgodayoA3A) Band name!! ---
**Author:** ![Bullitt](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bullitt/32/5725_2.png) [@Bullitt](https://boards.straightdope.com/u/Bullitt)\ **Post date:** [February 19, 2013, 3:17pm UTC](https://boards.straightdope.com/t/what-is-this-bolt-called/650521/20 "2013-02-19T15:17:04Z")
> [@leftfield6](#): > > Band name!! You’re onto something there.