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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Compact Extreme-Pressure Steel Threaded Pipe Fittings
These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized and zinc-plated steel, which have better corrosion resistance than plain steel fittings. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have either a gasket or a gasket and washer to prevent leaks.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- For Use With:
NPTF and UN/UNF (SAE Straight): Air, Hydraulic Fluid, Water
Metric, BSPP and BSPT: Air, Hydraulic Fluid, Oil, Water - Specifications Met: See table
| Thread Size | Dash Size | Drive Size | Max. Pressure | Material | Specifications Met | Each | |
UN/UNF (SAE Straight) Male | |||||||
|---|---|---|---|---|---|---|---|
| 3/8"-24 | 03 | 5/32" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 00000 |
| 5/16"-24 | 02 | 1/8" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 7/16"-20 | 04 | 3/16" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 1/2"-20 | 05 | 7/32" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 9/16"-18 | 06 | 1/4" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 3/4"-16 | 08 | 5/16" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 7/8"-14 | 10 | 3/8" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 1 1/16"-12 | 12 | 9/16" | 6,000 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 1 3/16"-12 | 14 | 9/16" | 5,500 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
| 1 5/16"-12 | 16 | 5/8" | 5,500 psi @ 72° F | Zinc Plated Steel | ASTM A108 | 000000000 | 0000 |
(SAE Straight) Male
Threads with Gasket
- For Use With: See table
- Specifications Met: See table
| Thread Size | Dash Size | Plug Construction | Max. Pressure | Material | For Use With | Specifications Met | Each | |
UN/UNF (SAE Straight) Male | ||||||||
|---|---|---|---|---|---|---|---|---|
| 5/16"-24 | 02 | Hollow | 7,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 00000 |
| 3/8"-24 | 03 | Hollow | 7,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 7/16"-20 | 04 | Hollow | 7,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 1/2"-20 | 05 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 9/16"-18 | 06 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 3/4"-16 | 08 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 7/8"-14 | 10 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 1 1/16"-12 | 12 | Hollow | 6,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 1 3/16"-12 | 14 | Hollow | 5,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
| 1 5/16"-12 | 16 | Hollow | 5,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 0000 |
Extreme-Pressure Steel Threaded Pipe Fittings
The strongest steel fittings we offer, these can withstand extreme-pressure applications.
Galvanized and zinc-plated steel fittings have better corrosion resistance than plain steel fittings. UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. They are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Temperature Range:
Buna-N Rubber: -20° to 200° F
Fluoroelastomer Rubber: -4° to 400° F - Specifications Met: ASTM B633, SAE J1926
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Flanges: Use Class 1500 steel
Buna-N Rubber Gasket | Fluoroelastomer Rubber Gasket | |||||||
|---|---|---|---|---|---|---|---|---|
Thread Size | Dash Size | Drive Size | Max. Pressure | Material | Each | Each | ||
UN/UNF (SAE Straight) Male | ||||||||
| 5/16"-24 | 02 | 1/8" | 5,500 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
| 7/16"-20 | 04 | 3/16" | 5,000 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 9/16"-18 | 06 | 1/4" | 4,000 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 3/4"-16 | 08 | 5/16" | 3,500 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 7/8"-14 | 10 | 3/8" | 2,700 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 1 1/16"-12 | 12 | 9/16" | 2,200 psi @ 72° F | Zinc-Plated Steel | 0000000 | 0000 | 0000000 | 0000 |
| 1 5/16"-12 | 16 | 5/8" | 2,000 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
| 1 5/8"-12 | 20 | 3/4" | 1,600 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
| 1 7/8"-12 | 24 | 3/4" | 1,200 psi @ 72° F | Zinc-Plated Steel | 0000000 | 00000 | 0000000 | 00000 |
Extreme-Pressure Stainless Steel Threaded Pipe Fittings
With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have a gasket to prevent leaks.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- For Use With:
UN/UNF (SAE Straight) Plugs: Hydraulic Fluid (Petroleum Base),Oil, Water
All Other Plugs: Hydraulic Fluid, Oil Steam, Water - Specifications Met:
NPTF and UN/UNF (SAE Straight): ASTM A479
BSPP and BSPT: ISO 1179, ISO 8434-6
316 Stainless Steel | |||||
|---|---|---|---|---|---|
| Thread Size | Dash Size | Plug Construction | Max. Pressure | Each | |
UN/UNF (SAE Straight) Male | |||||
| 3/8"-24 | 03 | Hollow | 9,000 psi @ 72° F | 000000000 | 000000 |
| 7/16"-20 | 04 | Hollow | 9,000 psi @ 72° F | 000000000 | 0000 |
| 1/2"-20 | 05 | Hollow | 7,200 psi @ 72° F | 000000000 | 00000 |
| 9/16"-18 | 06 | Hollow | 7,200 psi @ 72° F | 000000000 | 00000 |
| 3/4"-16 | 08 | Hollow | 7,200 psi @ 72° F | 000000000 | 00000 |
| 7/8"-14 | 10 | Hollow | 7,200 psi @ 72° F | 000000000 | 00000 |
| 1 1/16"-12 | 12 | Hollow | 7,200 psi @ 72° F | 000000000 | 00000 |
| 1 5/16"-12 | 16 | Hollow | 6,600 psi @ 72° F | 000000000 | 00000 |
Miniature Low-Pressure Brass Threaded Pipe Fittings
Less than an inch in length, these miniature fittings work well in low-pressure pipe lines that are tight on space. They are brass, which has good corrosion resistance. Nickel-plated brass fittings offer better corrosion resistance than unplated brass.
UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have a gasket to protect against leaks.
For technical drawings and 3-D models, click on a part number.
Compression Fittings for Stainless Steel Tubing
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Hydraulic Fluid, Water
- Temperature Range: -420° to 1200° F
- Tubing: Use with seamless 304 or 316 stainless steel that meets ASTM A269
- Specifications Met: SAE J514
Plugs insert into the end of a fitting.
- For Use With: See table
- Temperature Range: See table
- Tubing: See table
- Specifications Met: See table
For Tube | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | For Use With | Temp. Range, °F | For Tube Material | For Tube Specifications Met | For Tube Fabrication | Specifications Met | Each | |
| 1/4" | 0.035" | 316 Stainless Steel | 4,000 psi @ 72° F | Air, Hydraulic Fluid, Water | -420° to 1200° | 304 Stainless Steel, 316 Stainless Steel | ASTM A269 | Seamless, Welded | SAE J514 | 000000000 | 00000 |
| 3/8" | 0.035" | 316 Stainless Steel | 2,600 psi @ 72° F | Air, Hydraulic Fluid, Water | -420° to 1200° | 304 Stainless Steel, 316 Stainless Steel | ASTM A269 | Seamless, Welded | SAE J514 | 000000000 | 0000 |
| 1/2" | 0.049" | 316 Stainless Steel | 1,900 psi @ 72° F | Air, Hydraulic Fluid, Water | -420° to 1200° | 304 Stainless Steel, 316 Stainless Steel | ASTM A269 | Seamless, Welded | SAE J514 | 000000000 | 0000 |
| 3/4" | 0.065" | 316 Stainless Steel | 1,900 psi @ 72° F | Air, Hydraulic Fluid, Water | -420° to 1200° | 304 Stainless Steel, 316 Stainless Steel | ASTM A269 | Seamless, Welded | SAE J514 | 000000000 | 00000 |
- For Use With:
17-4 PH Stainless Steel: Air, Hydraulic Fluid, Water
316 Stainless Steel: Air, Cutting Oil, Ethyl Alcohol, Fuel Oil, Gasoline, Hydraulic Fluid, Isopropyl Alcohol, Mineral Oil, Natural Gas, Steam, Water - Temperature Range:
17-4 PH Stainless Steel: -420° to 1200° F
316 Stainless Steel: -75° to 750° F - Tubing:
17-4 PH Stainless Steel: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A269
316 Stainless Steel: Use with seamless 304 or 316/316L/316Ti stainless steel that meets DIN EN 10216-5 or DIN EN 10305-1 - Specifications Met:
17-4 PH Stainless Steel: SAE J514
316 Stainless Steel: ISO 8434-1, DIN 2353
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Sleeve Material | Max. Pressure | Each | |
| 1/4" | 0.035" | 17-4 PH Stainless Steel | 4,000 psi @ 72° F | 000000000 | 00000 |
| 3/8" | 0.035" | 17-4 PH Stainless Steel | 2,600 psi @ 72° F | 000000000 | 0000 |
| 1/2" | 0.049" | 17-4 PH Stainless Steel | 1,900 psi @ 72° F | 000000000 | 0000 |
| 3/4" | 0.065" | 17-4 PH Stainless Steel | 1,900 psi @ 72° F | 000000000 | 00000 |
High-Pressure Minimal-Spill Quick-Disconnect
Hose Couplings for Hydraulic Fluid
These couplings have the highest pressure rating of all the minimal-spill couplings we offer. Also known as flush-face couplings, the plugs and sockets have a flat face, which allows them to mate close against each other, reducing fluid loss when connecting and disconnecting the line. A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them when you need frequent access to a line. All of the High-Pressure Minimal-Spill quick-disconnect plugs are compatible with any of the High-Pressure Minimal-Spill quick-disconnect sockets of the same coupling size, regardless of the pipe size. Couplings are compatible with Snap-Tite 71 couplings. Also known as double shut-off couplings, the plugs and sockets both have a shut-off valve that stops the flow when the coupling is separated.
Plugs are also known as nipples.
Zinc-plated steel plugs and sockets have better strength and durability than 316 stainless steel plugs and sockets. They have fair corrosion resistance.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size. Pressure ratings are given for static (constant) pressure conditions.
Warning: Never attempt to connect or disconnect couplings when operating at maximum pressure. Stop the flow before you disconnect the line.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: See table
- Temperature Range: -40° to 200° F
- Compatible With: Snap-Tite 71
Plug Tip | ||||||||
|---|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Thread Size | Thread Type | Dash Size | Max. Pressure | Each | |
Zinc-Plated Steel | ||||||||
| 3/4 | 9/32" | 1 1/2" | 1 1/16"-12 | UN/UNF (SAE Straight) | 12 | 7,500 psi @ 72° F | 000000000 | 000000 |
| 1/2 | 7/32" | 1 3/16" | 3/4"-16 | UN/UNF (SAE Straight) | 08 | 10,000 psi @ 72° F | 000000000 | 00000 |
| 3/8 | 7/32" | 15/16" | 9/16"-18 | UN/UNF (SAE Straight) | 06 | 10,000 psi @ 72° F | 000000000 | 00000 |
| 1/4 | 3/16" | 3/4" | 7/16"-20 | UN/UNF (SAE Straight) | 04 | 10,000 psi @ 72° F | 000000000 | 00000 |
International Standard ISO Minimal-Spill
Quick-Disconnect Hose Couplings for Hydraulic Fluid
Also known as flush-face couplings, the plugs and sockets have a flat face, which allows them to mate close against each other, reducing fluid loss when connecting and disconnecting the line. A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them when you need frequent access to a line. All of the International Standard ISO Minimal-Spill quick-disconnect plugs are compatible with any of the International Standard ISO Minimal-Spill quick-disconnect sockets of the same coupling size, regardless of the pipe size. Also known as double shut-off couplings, the plugs and sockets both have a shut-off valve that stops the flow when the coupling is separated. They are zinc-plated steel, which has excellent strength and durability and fair corrosion resistance.
Plugs are also known as nipples.
Connect-under-pressure plugs have an internal reservoir, so they absorb up to 5,000 psi of residual pressure in the line. Use them when your hose is left in the sun and residual pressure cannot be safely released.
UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size. Pressure ratings are given for static (constant) pressure conditions.
Warning: Never attempt to connect or disconnect couplings when operating at maximum pressure. Stop the flow before you disconnect the line.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: See table
- Temperature Range: -20° to 212° F
- Compatible With: ISO 16028 Parker FEM, ISO 16028 Perfecting HT, ISO 16028 Snap-Tite 74
- Specifications Met: ISO 16028
- Maximum Pressure: 5,000 psi @ 72° F
- Temperature Range: -65° to 212° F
- Compatible With: ISO 16028 Faster 3FFH-Series, ISO 16028 Parker FEC-Series, ISO 16028 Stucchi APM-Series
- Specifications Met: ISO 16028
International Standard ISO B Quick-Disconnect
Hose Couplings for Hydraulic Fluid
A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them if you need frequent access to a hydraulic hose line. All of the International Standard ISO B quick-disconnect plugs are compatible with any of the International Standard ISO B quick-disconnect sockets of the same coupling size, regardless of the pipe size. Couplings meet ISO 7241-1 Series B dimensional and performance standards and are compatible with Parker 60 couplings. Also known as double shut-off couplings, the plugs and sockets both have a shut-off valve that stops the flow when the coupling is separated.
Plugs are also known as nipples.
Zinc-plated steel is stronger and more durable than other metals. It has fair corrosion resistance.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size. Pressure ratings are given for static (constant) pressure conditions.
Warning: Never attempt to connect or disconnect couplings when operating at maximum pressure. Stop the flow before you disconnect the line.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: See table
- Maximum Vacuum: 27 in. of Hg @ 72° F
- Temperature Range: -40° to 250° F
- Compatible With: ISO 7241-1 Series B, Parker 60
- Specifications Met: ISO 7241-1 Series B
Plugs | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Plug Tip | Optional Dust Caps | ||||||||
| Coupling Size | Lg. | Dia. | Thread Size | Dash Size | Max. Pressure | Each | Each | ||
Zinc-Plated Steel | |||||||||
| 1/8 | 5/16" | 7/16" | 7/16"-20 | 04 | 3,500 psi @ 72° F | 00000000 | 000000 | 00000000 | 00000 |
| 1/4 | 3/8" | 9/16" | 9/16"-18 | 06 | 3,500 psi @ 72° F | 00000000 | 00000 | 00000000 | 0000 |
| 3/8 | 1/2" | 3/4" | 3/4"-16 | 08 | 3,500 psi @ 72° F | 00000000 | 00000 | 00000000 | 0000 |
| 1/2 | 1/2" | 15/16" | 7/8"-14 | 10 | 3,500 psi @ 72° F | 00000000 | 00000 | 00000000 | 0000 |
| 3/4 | 3/4" | 1 1/4" | 1 1/16"-12 | 12 | 2,500 psi @ 72° F | 00000000 | 00000 | 00000000 | 0000 |
| 1 | 13/16" | 1 1/2" | 1 5/16"-12 | 16 | 2,000 psi @ 72° F | 00000000 | 000000 | 00000000 | 0000 |
Quick-Disconnect Hose Couplings for Pressure Testing
Add quick connection points for mechanical gauges and other diagnostic equipment to your line. These couplings are also known as test ports and diagnostic couplings. To take a reading, connect a socket to your gauge using a hose assembly. Then push the socket into a plug that’s permanently threaded into a test port on your line. No threading or unthreading is necessary. Add additional plugs to your line to take measurements at different points. To quickly move the gauge to a different test port, pull back the sleeve on the socket to disengage.
A complete coupling consists of a plug and socket (both sold separately). The plug and socket both have a shut-off valve to stop flow when the coupling is separated, so they're sometimes called double shut-off couplings. They meet ISO 15171-1, which is an international standard for dimensional and performance standards of flat-face diagnostic push-to-connect couplings.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size. Pressure ratings are given for static (constant) pressure conditions.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 6,000 psi @ 72° F
- Maximum Vacuum: 27.4 in. of Hg @ 72° F
- Temperature Range: -40° to 250° F
- Compatible With: Parker PD-Series, Eaton/Aeroquip FD90, Faster DF
- Specifications Met: ISO 15171-1, SAE J1502
Plugs are also known as nipples.
UN/UNF (SAE Straight) male threads have a gasket to prevent leaks. They’re also known as O-ring boss threads.
Grease Fitting Adapters
When the size or thread type of a fitting doesn't match an existing opening, use these adapters to make the connection.
Brass adapters resist corrosion better than zinc-plated steel adapters. UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage.
For technical drawings and 3-D models, click on a part number.
Connection | ||||
|---|---|---|---|---|
| Male | Female | Material | Pkg. | |
Adapters | ||||
| UN/UNF (SAE Straight) 10-32 | NPT 1/8 | 360 Brass | 00000000 | 000000 |