Editing Screw thread (section)

===Other current standards===
In particular applications and certain regions, threads other than the ISO metric screw threads remain commonly used, sometimes because of special application requirements, but mostly for reasons of [[backward compatibility]]:
* [[Unified Thread Standard]] (UTS), is the dominant thread standard used in the United States and Canada. It is defined in [http://www.asme.org/products/codes---standards/unified-inch-screw-threads--un-and-unr-thread-form ANSI/ASME B1.1 Unified Inch Screw Threads, (UN and UNR Thread Form)]. In some cases products are still made according to the old ''American National Standard Series'', which has slightly different specifications, and has been technically obsolete since 1949. The old national standard is compatible with the newer unified standard, but is long out of date.<ref>{{cite web|url=http://www.ring-plug-thread-gages.com/ti-N-vs-UN.htm|title=American National Standard vs. Unified Inch Standard|access-date=14 Mar 2019}}</ref> This unified standard includes:
** Unified Coarse (UNC), the successor to the obsolete National Coarse (NC) thread.
** Unified Fine (UNF), the successor to the obsolete National Fine (NF) thread.
** Unified Extra Fine (UNEF)
** Unified Special (UNS)
* [[National pipe thread]], used in North America for several purposes.
** National Pipe Taper (NPT)
** National Pipe Taper Fuel (NPTF), also known as Dryseal, a better sealing version of NPT.
** National Pipe Taper Railing fittings (NPTR)
** National Pipe Straight Coupling (NPSC)
** National Pipe Straight Mechanical (NPSM)
** National Pipe Straight Locknut (NPSL)
** National Pipe Straight Hose coupling (NPSH)
* [[British Standard Whitworth]] (BSW), and for other Whitworth threads including:
** [[British standard fine thread|British Standard Fine]] (BSF)
** Cycle Engineers' Institute (CEI) or [[British Standard Cycle]] (BSC)
* [[British standard pipe thread]] (BSP) which exists in a taper and non taper variant; used for other purposes as well
** British Standard Pipe Taper (BSPT)
* [[British Association screw threads]] (BA), primarily electronic/electrical, [[moving coil meter]]s and to mount optical lenses
* British Standard Buttress Threads (BS 1657:1950)
* British Standard for [[Spark plug|Spark Plugs]] BS 45:1972
* [[British standard brass thread|British Standard Brass]] a fixed pitch 26&nbsp;TPI thread
* [[Glass Packaging Institute]] threads (GPI), primarily for glass bottles and vials
* [[Power screw]] threads
** [[Acme thread form]]
** [[Square thread form]]
** [[Buttress thread]]
* [[Royal Microscopical Society]] (RMS) thread, also known as ''society thread'', is a special 0.8-inch diameter × 36 thread-per-inch (TPI) Whitworth thread form used for [[microscope objective lens]]es.
* [[Microphone stand]]s:
** {{frac|5|8}}-inch 27 [[threads per inch]] (TPI) Unified Special thread (UNS, USA and the rest of the world)
** {{frac|1|4}}-inch BSW (not common in the US, but used in the rest of the world)
** {{frac|3|8}}-inch BSW (not common in the US, but used in the rest of the world)
* [[Stage lighting]] suspension bolts (in some countries only; some have gone entirely metric, others such as [[Australia]] have reverted to the BSW threads, or have never fully converted):
** {{frac|3|8}}-inch BSW for lighter luminaires
** {{frac|1|2}}-inch BSW for heavier luminaires
* Tapping screw threads (ST) – ISO 1478
* Aerospace inch threads (UNJ) – ISO 3161, controlled root radius on male threads for greater fatigue strength with larger minor diameter on female threads to clear radius.
* Aerospace metric threads (MJ) – ISO 5855
* Tyre valve threads (V) – ISO 4570
* Metal bone screws (HA, HB) – ISO 5835
* [[Panzergewinde]] (Pg) (German) is an old German 80° thread (DIN 40430) that remained in use until 2000 in some electrical installation accessories in Germany.
* Fahrradgewinde (Fg) (English: bicycle thread) is a German bicycle thread standard (per DIN 79012 and DIN 13.1), which encompasses a lot of CEI and BSC threads as used on cycles and mopeds everywhere  (http://www.fahrradmonteur.de/fahrradgewinde.php)
* [[Edison base]] [[Incandescent light bulb]] holder screw thread
* [[Hose coupling#NST|Fire hose connection]] ([[National Fire Protection Association|NFPA]] standard 194)
* [[Garden hose#Standards and connectors|Hose Coupling Screw Threads]] (ANSI/ASME B1.20.7-1991 [R2003]) for garden hoses and accessories
* [[Löwenherz thread]],<ref>{{cite web|url=http://www.gewinde-normen.de/en/loewenherz-thread.html|title=Löwenherz Thread|first=Michael Prandl|last=www.mipraso.de|website=www.gewinde-normen.de|access-date=4 April 2018}}</ref> a German metric thread used for measuring instruments<ref>{{Harvnb|Ryffel|1988|p=1603}}.</ref>
* [[Sewing machine thread]]<ref>{{cite web|url=http://www.gewinde-normen.de/en/sewing-machine-thread.html|title=Sewing Machine Thread (Nähnorm 100)|first=Michael Prandl|last=www.mipraso.de|website=www.gewinde-normen.de|access-date=4 April 2018}}</ref>