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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Screw-On Hose Fittings for Hydraulic Fluid
With just a vise and a wrench, make or repair hose assemblies in the field. These fittings thread directly onto hydraulic hose, so you don't need to crimp. To install, separate the two pieces. Screw the hose end onto your hose first and then thread the two pieces of the fitting back together. These fittings compress against the hose to form a strong seal. Also known as reusable fittings, they can be unscrewed from your hose and used again.
Fittings with an O-ring face seal end are also known as Seal-Lok fittings. They swivel until tightened for easy installation.
Zinc-plated steel fittings are stronger and resist wear and tear better than 316 stainless steel fittings. The zinc plating resists rusting in wet environments.
Parker 51R series fittings are easier to install if you use a vice jaw liner (sold separately) to firmly hold the end of your hose in place while you screw on the fitting.
Note: Fittings are only for use with hydraulic hose.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 2,250 psi @ 72° F
- Temperature Range: -40° to 212° F
- For Hose Manufacturer Series: Parker 510D and 518D J517 SAE 100R7
Fittings | Hose | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Hose | Per Ft. | Vice Jaw Liners | ||||||||||
| ID | OD | For Tube OD | Thread Size  | Thread Type | Dash Size | Each | 1-99 | 100-Up | Each | |||
Zinc-Plated Steel—Parker 51R Series | ||||||||||||
| 3/8" | 5/8" | 3/8" | 9/16"-18 | UN/UNF (ORFS) | 06 | 000000000 | 000000 | 0000000 | 00000 | 00000 | 000000000 | 000000 |
| 1/2" | 13/16" | 1/2" | 3/4"-16 | UN/UNF (ORFS) | 08 | 000000000 | 00000 | 0000000 | 0000 | 0000 | 000000000 | 00000 |
Crimp-On Hose Fittings for Hydraulic Fluid
Crimp these fittings onto hydraulic hose for a permanent, leak-tight connection. Since they crimp on, they handle higher pressure than screw-on fittings. To install, use Parker crimping tools and dies (not included).
Fittings with a female end swivel 360° until tightened without you needing to move or twist the entire hose, making them easy to install.
Fittings with an O-ring face seal end are also known as Seal-Lok fittings.
Note: Fittings are only for use with hydraulic hose.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: See table
- Temperature Range: -40° to 210° F
- For Hose Manufacturer Series:
Parker 43 Series Fittings: 302 SAE J517 100R2AT, 422 SAE J517 100R1AT, 487 ISO17582-AC, 777 ISO17582-CC
Parker 56 Series Fittings: 510D J517 SAE 100R7, 518D J517 SAE 100R7
For Hose | ||||||||
|---|---|---|---|---|---|---|---|---|
| ID | OD | For Tube OD | Thread Size | Thread Type | Dash Size | Max. Pressure | Each | |
Zinc-Plated Steel—Parker 43 Series | ||||||||
| 1/4" | 1/2" | 1/4" | 9/16"-18 | UN/UNF (SAE Straight) | 04 | 4,000 psi @ 72° F | 0000000 | 00000 |
| 3/8" | 11/16" | 3/8" | 11/16"-16 | UN/UNF (SAE Straight) | 06 | 4,000 psi @ 72° F | 0000000 | 0000 |
| 1/2" | 13/16" | 1/2" | 13/16"-16 | UN/UNF (SAE Straight) | 08 | 4,000 psi @ 72° F | 0000000 | 00000 |
| 5/8" | 15/16" | 5/8" | 1"-14 | UN/UNF (SAE Straight) | 10 | 4,000 psi @ 72° F | 0000000 | 00000 |
| 3/4" | 1 1/8" | 3/4" | 1 3/16"-12 | UN/UNF (SAE Straight) | 12 | 4,000 psi @ 72° F | 0000000 | 00000 |
| 1" | 1 1/2" | 1" | 1 7/16"-12 | UN/UNF (SAE Straight) | 16 | 4,000 psi @ 72° F | 0000000 | 00000 |
Zinc-Plated Steel—Parker 56 Series | ||||||||
| 1/4" | 1/2" | 1/4" | 9/16"-18 | UN/UNF (SAE Straight) | 04 | 3,000 psi @ 72° F | 0000000 | 00000 |
| 1/4" | 1/2" | 3/8" | 11/16"-16 | UN/UNF (SAE Straight) | 06 | 3,000 psi @ 72° F | 0000000 | 00000 |
| 3/8" | 5/8" | 3/8" | 11/16"-16 | UN/UNF (SAE Straight) | 06 | 2,250 psi @ 72° F | 0000000 | 00000 |
| 3/8" | 5/8" | 1/2" | 13/16"-16 | UN/UNF (SAE Straight) | 08 | 2,250 psi @ 72° F | 0000000 | 00000 |
| 1/2" | 13/16" | 1/2" | 13/16"-16 | UN/UNF (SAE Straight) | 08 | 2,250 psi @ 72° F | 0000000 | 00000 |
| 5/8" | 1" | 5/8" | 1"-14 | UN/UNF (SAE Straight) | 10 | 2,250 psi @ 72° F | 0000000 | 00000 |
| 3/4" | 1 1/16" | 3/4" | 1 3/16"-12 | UN/UNF (SAE Straight) | 12 | 1,250 psi @ 72° F | 0000000 | 00000 |
O-Ring Face Seal Fittings for Stainless Steel Tubing
(SAE Straight) Male
Threads with Gasket
- For Use With: Air, Hydraulic Fluid, Water
- Temperature Range: -30° to 250° F
- Tubing: Use with welded or seamless 316 stainless steel
- Specifications Met: SAE J1453; flared fittings also meet SAE J514
A tube adapter sits flush against the flat face of the fitting so you can slide the tubing and fitting sideways to disconnect in cramped spaces. Fittings are also known as zero-clearance fittings. To install, weld a tube adapter to the tubing with a brazing ring, then mate the tube adapter to the fitting and screw on the nut. As the nut is tightened, the tube adapter compresses the O-ring, creating a strong seal. Fittings are 316 stainless steel for excellent corrosion resistance. Nuts, tube adapters, and brazing rings are sold separately.
NPTF (Dryseal) threads are compatible with NPT threads.
UN/UNF (SAE Straight) threads are also known as O-ring boss threads. Male threads with a gasket provide extra protection against leaks.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
| For Tube OD | Pipe Size | Thread Size | Material | Gasket Material | Max. Pressure | Each | |
NPTF Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/4" | 1/4 | __ | 316 Stainless Steel | __ | 4,000 psi @ 72° F | 0000000 | 000000 |
| 3/8" | 3/8 | __ | 316 Stainless Steel | __ | 3,300 psi @ 72° F | 0000000 | 00000 |
| 1/2" | 1/2 | __ | 316 Stainless Steel | __ | 2,400 psi @ 72° F | 0000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||||
| 1/4" | __ | 7/16"-20 | 316 Stainless Steel | Buna-N Rubber | 4,000 psi @ 72° F | 00000000 | 00000 |
| 3/8" | __ | 9/16"-18 | 316 Stainless Steel | Buna-N Rubber | 3,300 psi @ 72° F | 00000000 | 00000 |
| 1/2" | __ | 3/4"-16 | 316 Stainless Steel | Buna-N Rubber | 2,400 psi @ 72° F | 00000000 | 00000 |
(SAE Straight) Male
Threads with Gasket
Fittings that swivel until tightened rotate 360° for easy installation.
Female fittings mate with another O-ring face seal fitting without the need for a nut or a tube adapter.
| For Tube OD | Pipe Size | Thread Size | Material | Max. Pressure | Each | |
NPTF Threads | ||||||
|---|---|---|---|---|---|---|
| 1/4" | 1/4 | __ | 316 Stainless Steel | 4,000 psi @ 72° F | 00000000 | 0000000 |
| 3/8" | 3/8 | __ | 316 Stainless Steel | 3,300 psi @ 72° F | 00000000 | 000000 |
| 1/2" | 1/2 | __ | 316 Stainless Steel | 2,400 psi @ 72° F | 00000000 | 000000 |
UN/UNF (SAE Straight) Threads | ||||||
| 1/4" | __ | 7/16"-20 | 316 Stainless Steel | 4,000 psi @ 72° F | 00000000 | 000000 |
| 3/8" | __ | 9/16"-18 | 316 Stainless Steel | 3,300 psi @ 72° F | 00000000 | 000000 |
| 1/2" | __ | 3/4"-16 | 316 Stainless Steel | 2,400 psi @ 72° F | 00000000 | 000000 |
(SAE Straight) Male
Threads with Gasket
Fittings that swivel until tightened rotate 360° for easy installation.
Female fittings mate with another O-ring face seal fitting without the need for a nut or a tube adapter.
| For Tube OD | Pipe Size | Thread Size | Material | Max. Pressure | Each | |
NPTF Threads | ||||||
|---|---|---|---|---|---|---|
| 1/4" | 1/4 | __ | 316 Stainless Steel | 4,000 psi @ 72° F | 00000000 | 0000000 |
| 3/8" | 1/4 | __ | 316 Stainless Steel | 3,300 psi @ 72° F | 00000000 | 000000 |
| 1/2" | 1/4 | __ | 316 Stainless Steel | 2,400 psi @ 72° F | 00000000 | 000000 |
UN/UNF (SAE Straight) Threads | ||||||
| 1/4" | __ | 7/16"-20 | 316 Stainless Steel | 4,000 psi @ 72° F | 00000000 | 000000 |
| 3/8" | __ | 7/16"-20 | 316 Stainless Steel | 3,300 psi @ 72° F | 00000000 | 000000 |
| 1/2" | __ | 7/16"-20 | 316 Stainless Steel | 2,400 psi @ 72° F | 00000000 | 000000 |
Nuts for O-Ring Face Seal Fittings for Stainless Steel Tubing
- For Use With: Air, Hydraulic Fluid, Water
- Temperature Range: -30° to 250° F
- Tubing: Use with seamless or welded 316 stainless steel
Use these nuts with O-ring face seal fittings and tube adapters to create a tight seal on stainless steel tubing. They are 316 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
O-Ring Face Seal Tube Adapters for Stainless Steel Tubing
- For Use With: Air, Hydraulic Fluid, Water
- Temperature Range: -30° to 250° F
- Tubing: Use with seamless or welded 316 stainless steel
- Specifications Met: SAE J1453
Tube adapters sit flush against the flat face of an O-ring face seal fitting so you can slide the tubing and fitting sideways to disconnect in cramped spaces. To install, weld a tube adapter to the tubing with a brazing ring, then mate the tube adapter to an O-ring face seal fitting and screw on the nut. Tube adapters are 316 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
O-Ring Face Seal Fittings for Steel Tubing
(SAE Straight) Male
Threads with Gasket
- For Use With: Air, Hydraulic Fluid
- Temperature Range: -30° to 250° F, except BSPP fittings are -20° to 230° F
- Tubing: Use with seamless steel
- Specifications Met: SAE J1453
A tube adapter sits flush against the flat face of the fitting so you can slide the tubing and fitting sideways to disconnect in cramped spaces. Fittings are also known as zero-clearance fittings. To install, weld a tube adapter to the tubing with a brazing ring (sold separately), then mate the tube adapter to the fitting and screw on the nut. As the nut is tightened, the tube adapter compresses the O-ring, creating a strong seal. Fittings are zinc-plated steel for fair corrosion resistance. Nuts and tube adapters are sold separately.
NPTF (Dryseal) threads are compatible with NPT threads. BSPP and UN/UNF (SAE Straight) male threads have a gasket to prevent leaks. UN/UNF (SAE Straight) threads 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 Tube OD | Pipe Size | Thread Size | Material | Gasket Material | Max. Pressure | Each | |
BSPP Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/4" | 1/4 | __ | Zinc-Plated Steel | Buna-N Rubber | 6,000 psi @ 72° F | 0000000 | 00000 |
| 3/8" | 1/4 | __ | Zinc-Plated Steel | Buna-N Rubber | 6,000 psi @ 72° F | 0000000 | 0000 |
| 3/8" | 3/8 | __ | Zinc-Plated Steel | Buna-N Rubber | 5,000 psi @ 72° F | 0000000 | 0000 |
NPTF Threads | |||||||
| 1/4" | 1/4 | __ | Zinc-Plated Steel | __ | 6,000 psi @ 72° F | 0000000 | 0000 |
| 3/8" | 3/8 | __ | Zinc-Plated Steel | __ | 6,000 psi @ 72° F | 0000000 | 0000 |
| 1/2" | 1/2 | __ | Zinc-Plated Steel | __ | 6,000 psi @ 72° F | 0000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||||
| 1/4" | __ | 7/16"-20 | Zinc-Plated Steel | Buna-N Rubber | 6,000 psi @ 72° F | 0000000 | 0000 |
| 3/8" | __ | 9/16"-18 | Zinc-Plated Steel | Buna-N Rubber | 6,000 psi @ 72° F | 00000000 | 0000 |
| 1/2" | __ | 3/4"-16 | Zinc-Plated Steel | Buna-N Rubber | 6,000 psi @ 72° F | 00000000 | 0000 |
(SAE Straight) Male
Threads with Gasket
Fittings that swivel until tightened rotate 360° for easy installation.
| For Tube OD | Pipe Size | Thread Size | Material | Gasket Material | Max. Pressure | Each | |
NPT, NPTF Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/4" | 1/4 | __ | Zinc-Plated Steel | __ | 6,000 psi @ 72° F | 0000000 | 000000 |
| 3/8" | 3/8 | __ | Zinc-Plated Steel | __ | 6,000 psi @ 72° F | 00000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||||
| 1/4" | __ | 7/16"-20 | Zinc-Plated Steel | Buna-N Rubber | 6,000 psi @ 72° F | 0000000 | 00000 |
| 3/8" | __ | 9/16"-18 | Zinc-Plated Steel | Buna-N Rubber | 6,000 psi @ 72° F | 00000000 | 00000 |
| 1/2" | __ | 3/4"-16 | Zinc-Plated Steel | Buna-N Rubber | 6,000 psi @ 72° F | 00000000 | 00000 |
Fittings that swivel until tightened rotate 360° for easy installation.
| For Tube OD | Pipe Size | Thread Size | Material | Max. Pressure | Each | |
NPT, NPTF Threads | ||||||
|---|---|---|---|---|---|---|
| 1/4" | 1/4 | __ | Zinc-Plated Steel | 6,000 psi @ 72° F | 0000000 | 000000 |
| 3/8" | 1/4 | __ | Zinc-Plated Steel | 6,000 psi @ 72° F | 00000000 | 00000 |
| 1/2" | 1/4 | __ | Zinc-Plated Steel | 6,000 psi @ 72° F | 00000000 | 00000 |
UN/UNF (SAE Straight) Threads | ||||||
| 1/4" | __ | 7/16"-20 | Zinc-Plated Steel | 6,000 psi @ 72° F | 0000000 | 00000 |
| 1/2" | __ | 7/16"-20 | Zinc-Plated Steel | 6,000 psi @ 72° F | 00000000 | 00000 |
Nuts for O-Ring Face Seal Fittings for Steel Tubing
- For Use With: Air, Hydraulic Fluid
- Temperature Range: -30° to 250° F
- Tubing: Use with seamless steel
- Specifications Met: SAE J1453
Use these nuts with O-ring face seal fittings and tube adapters to create a tight seal on steel tubing. Nuts are zinc-plated steel for fair corrosion resistance.
For technical drawings and 3-D models, click on a part number.
O-Ring Face Seal Tube Adapters for Steel Tubing
- For Use With: Air, Hydraulic Fluid
- Temperature Range: -30° to 250° F
- Tubing: Use with seamless steel
- Specifications Met: SAE J1453
Tube adapters sit flush against the flat face of an O-ring face seal fitting so you can slide the tubing and fitting sideways to disconnect in cramped spaces. To install, weld a tube adapter to the tubing with a brazing ring, then mate the tube adapter to an O-ring face seal fitting and screw on the nut. Adapters are zinc-plated steel for fair corrosion resistance.
For technical drawings and 3-D models, click on a part number.