How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Universal Quick-Disconnect Hose Sockets for Air
Sockets accommodate five common plug shapes: Industrial, ARO, Lincoln, Tru-Flate, and European. Use them with a plug of the same coupling size to frequently connect and disconnect your line. Sockets are push-to-connect style. To connect, push the plug into the socket until you hear a click. To disconnect, slide the sleeve on the socket forward until the plug ejects. Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line. They are brass for good corrosion resistance.
Sockets with a push-on barbed end have sharp barb that grip rubber push-on hose with no clamps or ferrules required. the more you pull on the fittings, the tighter the hose will grip. To ensure proper connection, the barbed end has to be pushed in all the way, with the hose end concealed by the ring.
Sockets with a crimp-on barbed end insert into rubber hose and secure with a crimp-on hose ferrule.
For technical drawings and 3-D models, click on a part number.
ARO Quick-Disconnect Hose Couplings for Air
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k41c1-c01h-digital-master1572990247-p9@halfx_637085669153621209.png?ver=imagenotfound)
A complete coupling consists of a plug and a socket (both sold separately or in a set) that connect and disconnect quickly. Use them if you need frequent access to a line. All ARO plugs are compatible with any of the ARO sockets of the same coupling size, regardless of the pipe size or barbed hose ID.
Plugs are also known as nipples.
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line.
Plugs and sockets with a barbed end insert into plastic or rubber hose and secure with a clamp or a crimp-on hose ferrule.
Sleeve-lock sockets connect by sliding back the sleeve on the socket, inserting the plug, and releasing the sleeve. To disconnect, slide the sleeve back and pull out the plug.
Push-to-connect sockets are easier to connect than sleeve-lock sockets. Connect by pushing the plug into the socket until you hear a click. To disconnect, slide the sleeve on the socket forward until the plug ejects.
Manifolds give you a centralized and mounted location for plugging in your air tool line.
Steel is stronger and more durable than other metals. Zinc-plated steel has fair corrosion resistance and should be used primarily in dry environments. Nickel-plated steel has good corrosion resistance. Brass is softer than other metals, so it’s easier to thread together. It has good corrosion resistance. Nickel-plated brass offers better corrosion resistance than unplated brass. 303 stainless steel has very good corrosion resistance, so it’s the best choice for high-humidity environments.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13p2-c01h-digital@halfx_637085672522474463.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure:
For NPT Threads: 300 psi @ 72° F
For BSPT Threads: 230 psi @ 72°F - Maximum Vacuum:
For NPT Threads: 26 in. of Hg @ 72° F
For BSPT Threads: Not Rated - Temperature Range:
For NPT Threads: -40° to 225° F
For BSPT Threads: 0° to 212°F
Plug Tip | ||||||
---|---|---|---|---|---|---|
Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Each | |
Zinc-Plated Steel | ||||||
1/4 | 5/16" | 5/16" | 1/8 | NPT | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 1/8 | BSPT | 0000000 | 0000 |
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 0000 |
1/4 | 5/16" | 5/16" | 1/4 | BSPT | 0000000 | 0000 |
1/4 | 5/16" | 5/16" | 3/8 | BSPT | 0000000 | 0000 |
1/4 | 5/16" | 5/16" | 1/2 | BSPT | 0000000 | 00000 |
3/8 | 9/16" | 7/16" | 3/8 | NPT | 0000000 | 0000 |
Nickel-Plated Steel | ||||||
1/4 | 5/16" | 5/16" | 1/8 | NPT | 0000000 | 0000 |
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 0000 |
3/8 | 9/16" | 7/16" | 3/8 | NPT | 0000000 | 0000 |
303 Stainless Steel | ||||||
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 00000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k14p2-c01h-digital@halfx_637085678385843519.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure:
For NPT Threads: 300 psi @ 72° F
For BSPP Threads: 230 psi @ 72° F - Maximum Vacuum:
For NPT Threads: 26 in. of Hg @ 72° F
For BSPP Threads: Not Rated - Temperature Range:
For NPT Threads: -40° to 225° F
For BSPP Threads: 0° to 212° F
Plug Tip | ||||||
---|---|---|---|---|---|---|
Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Each | |
Zinc-Plated Steel | ||||||
1/4 | 5/16" | 5/16" | 1/8 | BSPP | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 0000 |
1/4 | 5/16" | 5/16" | 1/4 | BSPP | 0000000 | 0000 |
1/4 | 5/16" | 5/16" | 3/8 | BSPP | 0000000 | 0000 |
3/8 | 9/16" | 7/16" | 3/8 | NPT | 0000000 | 0000 |
Nickel-Plated Steel | ||||||
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 0000 |
3/8 | 9/16" | 7/16" | 3/8 | NPT | 0000000 | 0000 |
303 Stainless Steel | ||||||
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 00000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k18p2-c01h-digital@halfx_637085676683614794.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: See Table
- Maximum Vacuum: See Table
- Temperature Range: See Table
- Attachment Type: Use Worm-Drive Clamps or Crimp-On Hose Ferrules
Plug Tip | ||||||||
---|---|---|---|---|---|---|---|---|
Coupling Size | Lg. | Dia. | For Hose ID | Max. Pressure | Max. Vacuum | Temperature Range, °F | Each | |
Zinc-Plated Steel | ||||||||
1/4 | 5/16" | 5/16" | 1/4" | 300 psi @ 72° F | 26 in. of Hg @ 72° F | -40° to 225° | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 5/16" | 300 psi @ 72° F | 26 in. of Hg @ 72° F | -40° to 225° | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 6.3mm | 230 psi @ 72° F | Not Rated | 0° to 212° | 0000000 | 0000 |
1/4 | 5/16" | 5/16" | 10mm | 230 psi @ 72° F | Not Rated | 0° to 212° | 0000000 | 0000 |
3/8 | 9/16" | 7/16" | 3/8" | 300 psi @ 72° F | 26 in. of Hg @ 72° F | -40° to 225° | 0000000 | 0000 |
Nickel-Plated Steel | ||||||||
1/4 | 5/16" | 5/16" | 1/4" | 300 psi @ 72° F | 26 in. of Hg @ 72° F | -40° to 225° | 0000000 | 0000 |
1/4 | 5/16" | 5/16" | 5/16" | 300 psi @ 72° F | 26 in. of Hg @ 72° F | -40° to 225° | 0000000 | 0000 |
3/8 | 9/16" | 7/16" | 3/8" | 300 psi @ 72° F | 26 in. of Hg @ 72° F | -40° to 225° | 0000000 | 00000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/602/6026t11p2-c01h-digital@halfx_637085708979841442.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure:
For NPT Threads: 300 psi @ 72° F
For BSPT Threads: 230 psi @ 72° F - Maximum Vacuum:
For NPT Threads: 26 in. of Hg @ 72° F
For BSPT Threads: Not Rated - Temperature Range:
For NPT Threads: -40° to 225° F
For BSPT Threads: 0° to 212° F
For Plug Tip | ||||||
---|---|---|---|---|---|---|
Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Each | |
Brass | ||||||
1/4 | 5/16" | 5/16" | 1/8 | NPT | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 00000 |
3/8 | 9/16" | 7/16" | 3/8 | NPT | 0000000 | 00000 |
Nickel-Plated Brass | ||||||
1/4 | 5/16" | 5/16" | 1/8 | NPT | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 00000 |
3/8 | 9/16" | 7/16" | 3/8 | NPT | 0000000 | 00000 |
Zinc-Plated Steel | ||||||
1/4 | 5/16" | 5/16" | 1/4 | BSPT | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 3/8 | BSPT | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 1/2 | BSPT | 0000000 | 00000 |
303 Stainless Steel | ||||||
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 00000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/602/6026t12p2-c01h-digital@halfx_637085815652737995.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure:
For NPT Threads: 300 psi @ 72° F
For BSPP Threads: 230 psi @ 72° F - Maximum Vacuum:
For NPT Threads: 26 in. of Hg @ 72° F
For BSPP Threads: Not Rated - Temperature Range:
For NPT Threads: -40° to 225° F
For BSPP Threads: 0° to 212° F
For Plug Tip | ||||||
---|---|---|---|---|---|---|
Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Each | |
Brass | ||||||
1/4 | 5/16" | 5/16" | 1/8 | NPT | 0000000 | 000000 |
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 00000 |
3/8 | 9/16" | 7/16" | 3/8 | NPT | 0000000 | 00000 |
Nickel-Plated Brass | ||||||
1/4 | 5/16" | 5/16" | 1/8 | NPT | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 00000 |
3/8 | 9/16" | 7/16" | 3/8 | NPT | 0000000 | 00000 |
Zinc-Plated Steel | ||||||
1/4 | 5/16" | 5/16" | 1/4 | BSPP | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 3/8 | BSPP | 0000000 | 00000 |
1/4 | 5/16" | 5/16" | 1/2 | BSPP | 0000000 | 00000 |
303 Stainless Steel | ||||||
1/4 | 5/16" | 5/16" | 1/4 | NPT | 0000000 | 00000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k68multinegative_top_positive_right_flop15_1600256625_213@halfx_637358355432212567.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 230 psi @ 72° F
- Maximum Vacuum: Not Rated
- Temperature Range: 0° to 212° F
Number Of | For Plug Tip | |||||||
---|---|---|---|---|---|---|---|---|
Inlets | Outlets | Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Each | |
Zinc-Plated Steel | ||||||||
1 | 4 | 1/4 | 5/16" | 5/16" | 1/2 | BSPP | 0000000 | 0000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/602/6026t15p2-c01h-digital@halfx_637085665046519792.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225°
- Attachment Type: Use Worm-Drive Clamps or Crimp-On Hose Ferrules
![](/prerenderstable/mvPRE/contents/gfx/imagecache/602/6026t21p2-c01h-digital@halfx_637085687167889272.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
![](/prerenderstable/mvPRE/contents/gfx/imagecache/602/6026t22p2-c01h-digital@halfx_637085871920233546.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
![](/prerenderstable/mvPRE/contents/gfx/imagecache/602/6026t23p2-c01h-digital@halfx_637085760131446361.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
- Attachment Type: Use Worm-Drive Clamps or Crimp-On Hose Ferrules
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k41p2-c01h-digital@halfx_637085679964165070.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
Plug Tip | ||||||
---|---|---|---|---|---|---|
Pipe Size | Thread Type | Coupling Size | Lg. | Dia. | Each | |
Zinc-Plated Steel Plug and Brass Socket | ||||||
1/4 | NPT | 1/4 | 5/16" | 5/16" | 0000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k42p2-c01h-digital@halfx_637085700012639038.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
Plug Tip | ||||||
---|---|---|---|---|---|---|
Pipe Size | Thread Type | Coupling Size | Lg. | Dia. | Each | |
Zinc-Plated Steel Plug and Brass Socket | ||||||
1/4 | NPT | 1/4 | 5/16" | 5/16" | 0000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k44p2-c01h-digital@halfx_637085680832100788.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
Plug Tip | ||||||
---|---|---|---|---|---|---|
Pipe Size | Thread Type | Coupling Size | Lg. | Dia. | Each | |
Zinc-Plated Steel Plug and Brass Socket | ||||||
1/4 | NPT | 1/4 | 5/16" | 5/16" | 0000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k43p2-c01h-digital@halfx_637085682577139443.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
Plug Tip | ||||||
---|---|---|---|---|---|---|
Pipe Size | Thread Type | Coupling Size | Lg. | Dia. | Each | |
Zinc-Plated Steel Plug and Brass Socket | ||||||
1/4 | NPT | 1/4 | 5/16" | 5/16" | 0000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k45p2-c01h-digital@halfx_637085701530449710.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/534/5343k13c2-c01h-digital-master1572990246-p9@halfx_637085659829758740.png?ver=imagenotfound)
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
- Attachment Type: Use Worm-Drive Clamps
Plug Tip | |||||||
---|---|---|---|---|---|---|---|
For Hose ID | Pipe Size | Thread Type | Coupling Size | Lg. | Dia. | Each | |
Zinc-Plated Steel Plug and Brass Socket | |||||||
1/4" | 1/4 | NPT | 1/4 | 5/16" | 5/16" | 0000000 | 000000 |