Unions for Hydraulic Fluid

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98 Products

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.

High-Pressure Stainless Steel Threaded Pipe Fittings

Use these heavy duty fittings in high-pressure flow applications.

304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance. Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors

Exploded View

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: ASTM A182
Pipe Nipples and Pipe: Use Schedule 80 stainless steel

304 Stainless Steel
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
NPT Female
1/8	02	2,900 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
1/4	04	2,900 psi @ 72° F	1,900 psi @ 350° F	000000000	00000
3/8	06	2,900 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
1/2	08	2,900 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
3/4	12	2,900 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
1	16	2,900 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
1 1/4	20	2,900 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
1 1/2	24	2,900 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
2	32	2,900 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
316 Stainless Steel
NPT Female
1/8	02	2,900 psi @ 72° F	2,000 psi @ 350° F	00000000	00000
1/4	04	2,900 psi @ 72° F	2,000 psi @ 350° F	00000000	000000
3/8	06	2,900 psi @ 72° F	2,000 psi @ 350° F	00000000	000000
1/2	08	2,900 psi @ 72° F	2,000 psi @ 350° F	00000000	000000
3/4	12	2,900 psi @ 72° F	2,000 psi @ 350° F	00000000	000000
1	16	2,900 psi @ 72° F	2,000 psi @ 350° F	00000000	000000
1 1/4	20	2,900 psi @ 72° F	2,000 psi @ 350° F	00000000	000000
1 1/2	24	2,900 psi @ 72° F	2,000 psi @ 350° F	00000000	000000
2	32	2,900 psi @ 72° F	2,000 psi @ 350° F	00000000	000000

Precision Extreme-Pressure Stainless Steel Threaded Pipe Fittings

Made to tighter tolerances than other stainless steel pipe fittings, these are also known as instrumentation fittings. The male threads are rolled for extra strength in extreme-pressure applications. Fittings are commonly used to connect equipment in gas and hydraulic fluid lines. They are 316 stainless steel for excellent corrosion resistance.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors

Assembled View

Exploded View

For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM 276, ASTM A479

				Hex Width		316 Stainless Steel
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	(A)	(B)		Each
NPT Female
1/4	04	6,600 psi @ 72° F	6,600 psi @ 300° F	1 3/8"	1 3/16"	000000000	000000
3/8	06	5,300 psi @ 72° F	5,300 psi @ 300° F	1 1/2"	1 5/16"	000000000	00000
1/2	08	4,900 psi @ 72° F	4,900 psi @ 300° F	1 3/4"	1 5/8"	000000000	00000

High-Pressure Socket-Connect Stainless Steel Unthreaded Pipe Fittings

Forged for excellent strength, these heavy duty socket-connect fittings stand up to high-pressure applications. They are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection.

304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.

Union straight connectors separate into three pieces for access to your line.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors

Exploded View

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: ASTM A182
Pipe Nipples and Pipe: Use Schedule 80 stainless steel

				304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Dash Size	Max. Steam Pressure	Max. Pressure		Each		Each
1/4	04	1,900 psi @ 350° F	2,900 psi @ 72° F	000000000	000000	000000000	0000000
3/8	06	1,900 psi @ 350° F	2,900 psi @ 72° F	000000000	00000	000000000	000000
1/2	08	1,900 psi @ 350° F	2,900 psi @ 72° F	000000000	00000	000000000	000000
3/4	12	1,900 psi @ 350° F	2,900 psi @ 72° F	000000000	000000	000000000	000000
1	16	1,900 psi @ 350° F	2,900 psi @ 72° F	000000000	000000	000000000	000000
1 1/2	24	1,900 psi @ 350° F	2,900 psi @ 72° F	000000000	000000	000000000	000000
2	32	1,900 psi @ 350° F	2,900 psi @ 72° F	000000000	000000	000000000	000000

High-Pressure Iron and Steel Threaded Pipe Fittings

These fittings can stand up to high-pressure applications. Use them in noncorrosive environments.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections. Union connectors with gasket provide extra leak protection.

Phosphate-coated and zinc-phosphate-coated fittings offer some corrosion resistance, but aren't intended for corrosive environments.

Note: The maximum pressure listed for Class 3000 fittings is for conditions where there are no sudden changes in pressure or velocity. Please refer to ASME B16.11 to determine the specific maximum operating pressure for your application.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors

Exploded View

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: MSS SP-83, ASME B1.20.1, ASTM A105
Pipe Nipples and Pipe: Use Schedule 160 steel
Flanges: Use Class 1500 steel

NPT Female
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	02	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000
1/4	04	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
3/8	06	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
1/2	08	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
3/4	12	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
1	16	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
1 1/4	20	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
1 1/2	24	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
2	32	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	0000000	00000
2 1/2	40	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000
3	48	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000

Union Straight Connectors with Gasket

Exploded View

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Specifications Met: MSS SP-83, ASTM A105
Pipe Nipples and Pipe: Use Schedule 160 steel
Flanges: Use Class 1500 steel

NPT Female
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material	Gasket Material		Each
1/2	08	3,000 psi @ 100° F	1,500 psi @ 700° F	Phosphate-Coated Steel	Graphite-Filled 304 Stainless Steel	0000000	000000
3/4	12	3,000 psi @ 100° F	1,500 psi @ 700° F	Phosphate-Coated Steel	Graphite-Filled 304 Stainless Steel	0000000	00000
1	16	3,000 psi @ 100° F	1,500 psi @ 700° F	Phosphate-Coated Steel	Graphite-Filled 304 Stainless Steel	0000000	00000
1 1/4	20	3,000 psi @ 100° F	1,500 psi @ 700° F	Phosphate-Coated Steel	Graphite-Filled 304 Stainless Steel	0000000	000000
1 1/2	24	3,000 psi @ 100° F	1,500 psi @ 700° F	Phosphate-Coated Steel	Graphite-Filled 304 Stainless Steel	0000000	000000
2	32	3,000 psi @ 100° F	1,500 psi @ 700° F	Phosphate-Coated Steel	Graphite-Filled 304 Stainless Steel	0000000	000000

Union Straight Connectors with Lugs

Exploded View

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: MSS SP-83, ASME B1.20.1, ASTM A105
Pipe Nipples and Pipe: Use Schedule 160 steel
Flanges: Use Class 1500 steel

NPT Female
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/2	08	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000
3/4	12	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	00000
1	16	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000
1 1/4	20	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000
1 1/2	24	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000
2	32	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000
2 1/2	40	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000
3	48	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000
4	64	3,000 psi @ 72° F	300 psi @ 360° F	Zinc-Phosphate-Coated Steel	00000000	000000

High-Pressure Galvanized Steel Threaded Pipe Fittings

A galvanized finish gives these fittings better corrosion resistance than our plain steel high-pressure fittings. Also known as Pressure Class 3000 fittings, they have excellent strength to handle high-pressure applications.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors

Exploded View

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: ASME B1.20.1, ASTM A105, ASTM B633, MSS SP-83
Pipe Nipples and Pipe: Use Schedule 160 steel

NPT Female
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
1/4	04	3,000 psi @ 72° F	300 psi @ 360° F	00000000	000000
3/8	06	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1/2	08	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
3/4	12	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1	16	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1 1/4	20	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
1 1/2	24	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000
2	32	3,000 psi @ 72° F	300 psi @ 360° F	00000000	00000

Extreme-Pressure Steel Threaded Pipe Fittings

The strongest steel fittings we offer, these can withstand extreme-pressure applications.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

Note: The maximum pressure listed for Class 6000 fittings is for conditions where there are no sudden changes in pressure or velocity. Please refer to ASME B16.11 to determine the specific maximum operating pressure for your application.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors

Exploded View

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 6000
Specifications Met: ASME B1.20.1, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

NPT Female
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	04	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	000000
3/8	06	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	Steel	000000000	000000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	000000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	Steel	00000000	000000

High-Pressure Socket-Connect Steel Unthreaded Pipe Fittings

Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection. Fittings have heavy duty construction that stands up to high-pressure applications. They are for use in noncorrosive environments.

Union straight connectors separate into three pieces for access to your line. Union straight connectors with gasket provide extra leak protection.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors with Gasket

For Use With: Air, Water, Oil, Natural Gas, Steam, Hydraulic Fluid
Temperature Range: -20° to 700° F
Specifications Met: MSS SP-83, ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 300 and 600 steel

Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Material	Gasket Material		Each
1/2	08	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	0000000
3/4	12	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	000000
1	16	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	00000
1 1/4	20	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	000000
1 1/2	24	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	000000
2	32	3,000 psi @ 100° F	1,500 psi @ 700° F	Steel	Graphite-Filled 304 Stainless Steel	0000000	000000

Extreme-Pressure Socket-Connect Steel Unthreaded Pipe Fittings

Also known as Pressure Class 6000 fittings, these heavy duty forged fittings are the strongest steel fittings we offer. They are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection. Fittings are for use in noncorrosive environments.

Union straight connectors separate into three pieces for access to your line.

For technical drawings and 3-D models, click on a part number.

Union Straight Connectors

Exploded View

For Use With: Air, Water, Oil, Natural Gas, Steam, Hydraulic Fluid
Pressure Class : 6000
Specifications Met: ASTM A105
Pipe Nipples and Pipe: Use Schedule XXH steel
Flanges: Use Class 1500 steel

Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
1/2	08	6,000 psi @ 72° F	300 psi @ 360° F	000000000	000000
3/4	12	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1	16	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/4	20	6,000 psi @ 72° F	300 psi @ 360° F	000000000	00000
1 1/2	24	6,000 psi @ 72° F	300 psi @ 360° F	000000000	000000
2	32	6,000 psi @ 72° F	300 psi @ 360° F	000000000	000000

Hose Unions for Chemicals and Petroleum

Exploded View

For Use With: Citric Acid, Cutting Oil, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Oil
Maximum Pressure: See table

Access your line without twisting the hose—these unions separate into three pieces. Also known as WECO couplings and hammer unions, they’re made of forged steel that’s tough enough to be tightened with the blow of a hammer. Use them with other connectors that have the same hammer union figure and pipe size.

Note: Pressure ratings are given for static (constant) pressure conditions with no instantaneous increases in pressure.

For technical drawings and 3-D models, click on a part number.

Steel
Pipe Size	Dash Size	Gasket Material	Hammer Union Figure	Max. Pressure		Each
NPT Female
1	16	__	200	2,000 psi @ 72° F	0000000	000000
1	16	Buna-N Rubber	206	2,000 psi @ 72° F	0000000	00000
1 1/2	24	__	200	2,000 psi @ 72° F	0000000	00000
2	32	__	100	1,000 psi @ 72° F	0000000	00000
2	32	__	200	2,000 psi @ 72° F	0000000	00000
2	32	Buna-N Rubber	206	2,000 psi @ 72° F	0000000	00000
4	64	Buna-N Rubber	206	2,000 psi @ 72° F	0000000	000000
6	96	Buna-N Rubber	206	2,000 psi @ 72° F	0000000	000000
8	__	Buna-N Rubber	206	2,000 psi @ 72° F	0000000	000000