High Pressure Seals | McMaster-Carr

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40 Products

High-Pressure U-Cup Seals


Side 1	Side 2	Profile


Rod Installation	Piston Installation

Rated for pressure up to 10,000 psi, these leather U-cups handle over 80 times more pressure than our Buna-N U-cups. Leather is tough, pliable, and wear resistant, so it flexes to fit uneven surfaces and fill voids. U-cups can be used for rod and piston sealing. Pistons require two seals—install one facing in each direction.

Note: Maximum performance values cannot be achieved simultaneously; for example, speed is affected by pressure, temperature, and other operating conditions.

	For Rod Sealing		For Piston Sealing
	For Rod Dia.	For Groove Dia.	For Bore Dia.	For Groove Dia.	Max. Speed	Max. Pressure, psi	Temp. Range, ° F	Color		Each
Wax-Filled Leather







				For 0.250" Wide Grooves

				1/4"	0.750"	3/4"	0.250"	Not Rated	10,000	0 to 180	Black	0000000	000000


				3/8"	0.875"	7/8"	0.375"	Not Rated	10,000	0 to 180	Black	0000000	00000
				1/2"	1.000"	1"	0.500"	Not Rated	10,000	0 to 180	Black	0000000	00000
				5/8"	1.125"	1 1/8"	0.625"	Not Rated	10,000	0 to 180	Black	0000000	00000
				3/4"	1.250"	1 1/4"	0.750"	Not Rated	10,000	0 to 180	Black	0000000	00000
				7/8"	1.375"	1 3/8"	0.875"	Not Rated	10,000	0 to 180	Black	0000000	00000
				1"	1.500"	1 1/2"	1.000"	Not Rated	10,000	0 to 180	Black	0000000	00000
				1 1/8"	1.625"	1 5/8"	1.125"	Not Rated	10,000	0 to 180	Black	0000000	00000
				1 1/4"	1.750"	1 3/4"	1.250"	Not Rated	10,000	0 to 180	Black	0000000	00000

High-Pressure Hydraulic Cylinder Buffering Seals


Side 1	Side 2	Profile

Rated for pressure up to 10,000 psi, these seals withstand the highest pressure of our buffering seals. Use in tandem with rod seals to protect the cylinder from pressure spikes and shock.

Note: Maximum performance values cannot be achieved simultaneously; for example, speed is affected by pressure, temperature, and other operating conditions.

		For Groove
	For Rod Dia.	Dia.	Wd.	Max. Speed, ft/sec	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color	Backup Ring Color		Each
Polyurethane Rubber with Nylon Backup Ring



		1/2"	0.750"	0.206"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000


		3/4"	1.125"	0.206"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		1"	1.375"	0.206"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		1 1/8"	1.500"	0.206"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		1 1/4"	1.625"	0.206"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		1 3/8"	1.750"	0.206"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		1 1/2"	2.000"	0.275"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		1 3/4"	2.250"	0.275"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		1 7/8"	2.375"	0.275"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		2"	2.500"	0.275"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		2 1/2"	3.000"	0.275"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000


		2 3/4"	3.250"	0.275"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000
		3"	3.500"	0.275"	1.6	10,000	-65 to 250	Durometer 90A (Hard)	Beige	Gray	0000000	00000

High-Pressure Leather Stackable V-Ring Packing Seals


Five V-Rings Stacked		Profile

These leather V-ring packing seals handle over twice the pressure as PTFE. Leather is tough, pliable, and wear resistant, so it flexes to fit uneven surfaces and fill voids. Stack as many V-rings as you need to fill grooves in valves, pumps, and cylinders—each additional ring adds to the sealing force.

Note: Maximum performance values cannot be achieved simultaneously; for example, speed is affected by pressure, temperature, and other operating conditions.

						Max. Pressure, psi
	ID	OD	V-Ring Wd.	Ht.	Max. Speed	For Reciprocating Motion	For Oscillating Motion	Temp. Range, ° F	pH Resistance	Color	For Use With		Each
Wax-Filled Leather



		1/4"	5/8"	0.083"	0.188"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	000000


		3/8"	3/4"	0.083"	0.188"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		1/2"	7/8"	0.083"	0.188"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		1/2"	1"	0.083"	0.250"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		9/16"	1 1/16"	0.083"	0.250"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		5/8"	1 1/8"	0.083"	0.250"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		3/4"	1 1/4"	0.083"	0.250"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		1"	1 1/2"	0.083"	0.250"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		1 1/8"	1 5/8"	0.083"	0.250"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		1 1/4"	1 3/4"	0.083"	0.250"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		1 3/8"	2"	0.140"	0.313"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000


		1 1/2"	2 1/8"	0.140"	0.313"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000
		1 3/4"	2 3/8"	0.140"	0.313"	Not Rated	5,000	1,000	0 to 180	0 to 7	Black	Animal Oil, Brake Fluid, Diluted Salt Solutions, Food, Grease, Hydraulic Oil, Mineral Oil, Motor Oil, Oil, Synthetic Lubricants, Transmission Fluid, Vegetable Oil, Water	0000000	00000

High-Pressure Piston Seals


	Profile

Rated for pressure up to 10,000 psi, these seals withstand the highest pressure of our piston seals. They have two high-strength backup rings that protect against extrusion.

Note: Maximum performance values cannot be achieved simultaneously; for example, speed is affected by pressure, temperature, and other operating conditions.

		For Groove								O-Ring
	For Bore Dia.	Dia.	Wd.	O-Ring Dash No. Equiv.	Max. Speed, ft/sec	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color	Hardness	Color		Each
Glass-Filled PTFE with Nylon Backup Ring and Buna-N O-Ring



		2"	1.625"	0.424"	Not Rated	5	10,000	-30 to 230	Durometer 60D (Extra Hard)	Gray	Durometer 70A (Hard)	Black	0000000	000000


		2 1/2"	2.125"	0.424"	Not Rated	5	10,000	-30 to 230	Durometer 60D (Extra Hard)	Gray	Durometer 70A (Hard)	Black	0000000	00000
		3"	2.520"	0.579"	Not Rated	5	10,000	-30 to 230	Durometer 60D (Extra Hard)	Gray	Durometer 70A (Hard)	Black	0000000	00000
		3 1/2"	3.020"	0.579"	Not Rated	5	10,000	-30 to 230	Durometer 60D (Extra Hard)	Gray	Durometer 70A (Hard)	Black	0000000	00000
		4"	3.520"	0.579"	Not Rated	5	10,000	-30 to 230	Durometer 60D (Extra Hard)	Gray	Durometer 70A (Hard)	Black	0000000	00000