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((short description|Type of mating fastener))
((Redirect|Barrel bolt|the type of latch called a barrel bolt|Latch (hardware)))
((more citations needed|date=April 2018))
[[File:Sleeve nuts.jpg|thumb|Sleeve nuts, one with mating bolt]]

A '''sex bolt''' is a type of [[fastener]] comprising a mated pair of '''screw and post''', which are a [[machine screw]] and a [[nut (hardware)|nut]] that is barrel-shaped. The nut has a [[flange]] and a protruding [[boss (engineering)|boss]] that is internally [[screw thread|threaded]]. The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing surface.

A sex bolt is normally chosen because of the low profile of its nut compared with that of other nuts. The sex bolt often has a built-in feature, such as a slot, to aid in tightening the fastener. Some sex bolts, more commonly known as "architectural bolts", have [[Knurling|knurled]] barrels to allow one-sided assembly.

The sex bolt consists of a female (internally) threaded barrel (nut) and a male (externally) threaded screw. Both the barrel and screw have heads designed to clamp (bind) material between the head of the barrel and the head of the screw, or to bridge the gap between two parts.

Other names for sex bolts, or (in some cases) for the female half specifically, include:
* architectural bolts,<ref>((Cite web |title=Architectural Sex Bolts |url=https://www.fastenright.com/general-fixings/architectural-sex-bolts/sb01 |access-date=2023-06-06 |website=Fastenright Ltd |language=en-GB))</ref>
* barrel bolts,((cn|date=June 2023))
* barrel nuts,<ref name=":0">((Cite web |title=Barrel Nuts |url=https://www.accu.co.uk/1493-barrel-nuts |access-date=6 June 2023 |website=Accu Limited))</ref>
* binding barrels,<ref name="McMaster-Carr: Binding Barrels and Screws">((cite web |url=https://www.mcmaster.com/screws/binding-barrels-and-screws-4/ |title=Binding Barrels and Screws |publisher=McMaster-Carr |work=Catalog |accessdate=29 April 2020))</ref>
* book screws<ref>((Cite web |title=Book Screws - Female ((!)) Components Direct |url=https://www.components-direct.com/component-and-fastener-products/book-screws-female |access-date=2023-06-06 |website=www.components-direct.com))</ref> or book binding screws,<ref>((Cite web |title=Metal Binding Screws ((!)) Binding Screws ((!)) Book Screw ((!)) Binder Screws ((!)) Brass Binding Screws ((!)) Essentra Components UK |url=https://www.essentracomponents.com/en-gb/p/book-binding-screws-metal |access-date=2023-06-06 |website=www.essentracomponents.com |language=en-gb))</ref>
* Chicago screws,<ref name=":0" /> or Chicago binding screws and posts,<ref>((Cite web |title=Brass Chicago Binding Screws ((!)) Made in the USA |url=https://www.usbind.com/collections/chicagoscrews/standard |access-date=2023-06-06 |website=USBind.com))</ref>
* connector bolts,<ref name="accurate">((Citation |title = Sex bolts & mating fasteners |year = 2014 |url = http://issuu.com/ampg.com/docs/2012-ampg-matingfast/1?e=4504190/2600594 |accessdate = 2014-10-06))</ref><ref>((cite web |url=http://www.boltdepot.com/Sex_bolts.aspx |title=catalog page (Sex Bolts) |publisher=Bolt Depot |accessdate=2013-03-21)) Typical catalogue page.</ref>
* female screws,<ref name=":0" />
* posts and screws, screws and posts,<ref>((Cite web |title=Brass Screw & Post - 13mm |url=https://store.bookbinding.co.uk/store/product/1161/Brass-Screw-%26-Post-13mm/ |access-date=2023-06-06 |website=Shepherds London))</ref> or screw-in-post fasteners,
* sleeve nuts<ref>((Cite web |title=Socket Countersunk Sleeve Nuts |url=https://www.pts-uk.com/products/nuts/socket-countersunk-sleeve-nuts/metric-a2/A906204 |access-date=2023-06-06 |website=www.pts-uk.com))</ref>

Applications vary widely from book binding to installing bathroom partitions. This group of fasteners are used to assemble fitness apparatus, solar panels, playground equipment, railing systems, furniture, athletic helmets, knives, store fixtures, signs, panic bars, and many other products.

Technical guide to mating fasteners:((cn|date=June 2022))

; Barrel diameter: mating fasteners often are going through pre-drilled holes. The barrel diameter should be slightly less than the installation hole.
; Barrel length: the barrel length is measured from underneath the head to the end of the barrel. Normally the length of the barrel is shorter than the thickness of the material being clamped. Another common term is "grip length", which is the thickness of the material that a mating bolt can effectively fasten or clamp.
; Thread size: length and thread class fit for both barrel and screw. The more thread depth, the more difficult these parts are to manufacture, and the more expensive.
; Head style: the most common head style for a mating fastener is a "truss" head. Other head styles are button, flat, grommet, hex head, large truss, low profile, oval, rivet and T-head.
; Drive systems: mating fasteners are available in a variety of drives such as slotted, socket, Phillips, combination Phillips/slotted, as well as tamper-resistant drives: one way, 6-lobe with pin and drilled spanner.
; Material and finish: mating fasteners are available in aluminium, steel, brass, copper, stainless steel and plastic materials. Barrels and screws are available anodized, zinc-plated, brass-plated, chrome-plated, bronze-plated, nickel-plated and black-oxide finish.

==References==
((Commons category|Sleeve nuts))

((reflist))

((Nuts (hardware)))

[[Category:Nuts (hardware)]]

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