Cup Gaskets | McMaster-Carr

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212 Products

O-Ring-Loaded U-Cup Seals


Side 1	Side 2	Profile


Rod Installation	Piston Installation

Also known as loaded-lip seals and PolyPaks, an O-ring secures these U-cups to the rod or piston for better sealing performance at lower pressures than unsupported U-cup seals. Because U-cups have a sealing lip on both the inside and outside edges, they 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							O-Ring
	For Rod Dia.	For Groove Dia.	For Bore Dia.	For Groove Dia.	Max. Speed, ft/sec	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color	Hardness	Color		Each
Polyurethane Rubber with Buna-N O-Ring







				For 0.138" Wide Grooves

				1/8"	0.375"	3/8"	0.125"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	00000


				3/16"	0.438"	7/16"	0.187"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				1/4"	0.500"	1/2"	0.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				5/16"	0.563"	9/16"	0.312"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				3/8"	0.625"	5/8"	0.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				7/16"	0.688"	11/16"	0.437"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				1/2"	0.750"	3/4"	0.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				5/8"	0.875"	7/8"	0.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				3/4"	1.000"	1"	0.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				7/8"	1.125"	1 1/8"	0.875"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				1"	1.250"	1 1/4"	1.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000


				1 1/8"	1.375"	1 3/8"	1.125"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
				1 1/4"	1.500"	1 1/2"	1.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000




						For 0.172" Wide Grooves

						3/4"	1.063"	1 1/16"	0.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000


						1"	1.313"	1 5/16"	1.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
						1 3/16"	1.500"	1 1/2"	1.187"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
						1 3/8"	1.688"	1 11/16"	1.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000




								For 0.206" Wide Grooves

								3/16"	0.563"	9/16"	0.187"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000


								3/8"	0.750"	3/4"	0.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								7/16"	0.813"	13/16"	0.437"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								1/2"	0.875"	7/8"	0.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								5/8"	1.000"	1"	0.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								3/4"	1.125"	1 1/8"	0.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								7/8"	1.250"	1 1/4"	0.875"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								1"	1.375"	1 3/8"	1.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								1 1/8"	1.500"	1 1/2"	1.125"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								1 3/16"	1.563"	1 9/16"	1.187"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								1 1/4"	1.625"	1 5/8"	1.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000


								1 3/8"	1.750"	1 3/4"	1.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								1 1/2"	1.875"	1 7/8"	1.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								1 5/8"	2.000"	2"	1.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								1 7/8"	2.250"	2 1/4"	1.875"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
								2"	2.375"	2 3/8"	2.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
2 1/8"								2.500"	2 1/2"	2.125"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
2 3/8"	2.750"							2 3/4"	2.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
2 1/2"	2.875"							2 7/8"	2.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
2 5/8"	3.000"							3"	2.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
2 3/4"	3.125"							3 1/8"	2.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000




		For 0.275" Wide Grooves

		1/2"	1.000"					1"	0.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000


		5/8"	1.125"					1 1/8"	0.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		3/4"	1.250"					1 1/4"	0.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		7/8"	1.375"					1 3/8"	0.875"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		1"	1.500"					1 1/2"	1.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		1 1/8"	1.625"					1 5/8"	1.125"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		1 3/16"	1.688"					1 11/16"	1.187"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		1 1/4"	1.750"					1 3/4"	1.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		1 3/8"	1.875"					1 7/8"	1.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		1 1/2"	2.000"					2"	1.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		1 3/4"	2.250"					2 1/4"	1.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000


		2"	2.500"					2 1/2"	2.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		2 1/4"	2.750"					2 3/4"	2.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	0000000	0000
		2 1/2"	3.000"					3"	2.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		2 3/4"	3.250"	3 1/4"				2.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		3"	3.500"	3 1/2"	3.000"			1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		3 1/2"	4.000"	4"	3.500"			1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		3 3/4"	4.250"	4 1/4"	3.750"			1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		4"	4.500"	4 1/2"	4.000"			1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		4 1/2"	5.000"	5"	4.500"			1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		4 3/4"	5.250"	5 1/4"	4.750"			1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000


		6 1/2"	7.000"	7"	5.000"			1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000




				For 0.343" Wide Grooves

				1 3/8"	2.000"	2"	1.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000


				1 7/8"	2.500"	2 1/2"	1.875"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
				2"	2.625"	2 5/8"	2.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
				2 3/8"	3.000"	3"	2.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
				5 3/8"	6.000"	6"	5.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
				7 3/8"	8.000"	8"	7.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000




						For 0.413" Wide Grooves

						1 1/4"	2.000"	2"	1.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000


						1 1/2"	2.250"	2 1/4"	1.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
						1 5/8"	2.375"	2 3/8"	1.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
						1 3/4"	2.500"	2 1/2"	1.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
						2"	2.750"	2 3/4"	2.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
						2 1/8"	2.875"	2 7/8"	2.125"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
						2 1/4"	3.000"	3"	2.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
						2 1/2"	3.250"	3 1/4"	2.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
						2 3/4"	3.500"	3 1/2"	2.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
						3"	3.750"	3 3/4"	3.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
3 1/4"						4.000"	4"	3.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000


3 1/2"	4.250"					4 1/4"	3.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
3 3/4"	4.500"					4 1/2"	3.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
4 3/4"	5.500"					5 1/2"	4.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000

High-Stability O-Ring-Loaded U-Cup Seals


Side 1	Side 2	Profile


Rod Installation	Piston Installation

Also known as Type B seals, loaded-lip seals, and PolyPaks, these U-cups are wider than our other O-ring-loaded U-cup seals for better stability. An O-ring secures them to the rod or piston, preventing leaks at low pressure and as the seal wears. Because U-cups have a sealing lip on both the inside and outside edges, they 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							O-Ring
	For Rod Dia.	For Groove Dia.	For Bore Dia.	For Groove Dia.	Max. Speed, ft/sec	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color	Hardness	Color		Each
Polyurethane Rubber with Buna-N O-Ring







				For 0.206" Wide Grooves

				5/8"	0.875"	7/8"	0.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000


				3/4"	1.000"	1"	0.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
				1"	1.250"	1 1/4"	1.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
				1 1/4"	1.500"	1 1/2"	1.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000




						For 0.253" Wide Grooves

						1 3/4"	2.125"	2 1/8"	1.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000




								For 0.275" Wide Grooves

								1/4"	0.500"	1/2"	0.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000


								3/8"	0.625"	5/8"	0.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								1/2"	0.750"	3/4"	0.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								5/8"	0.875"	7/8"	0.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								3/4"	1.000"	1"	0.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								7/8"	1.125"	1 1/8"	0.875"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								1"	1.250"	1 1/4"	1.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								1 1/16"	1.313"	1 5/16"	1.062"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								1 1/8"	1.375"	1 3/8"	1.125"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								1 1/4"	1.500"	1 1/2"	1.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								1 1/4"	1.625"	1 5/8"	1.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000


								1 3/8"	1.625"	1 5/8"	1.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								1 1/2"	1.750"	1 3/4"	1.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								2"	2.250"	2 1/4"	2.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
								2 1/8"	2.375"	2 3/8"	2.125"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000




										For 0.343" Wide Grooves

										7/8"	1.250"	1 1/4"	0.875"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000


										1"	1.375"	1 3/8"	1.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
										1 3/8"	1.750"	1 3/4"	1.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
										1 1/2"	1.875"	1 7/8"	1.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
										1 5/8"	2.000"	2"	1.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
										1 3/4"	2.125"	2 1/8"	1.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
										2"	2.375"	2 3/8"	2.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000




										For 0.413" Wide Grooves

										1"	1.500"	1 1/2"	1.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000


		1 1/4"	1.750"							1 3/4"	1.250"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
		1 3/8"	1.750"							1 3/4"	1.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
		1 1/2"	1.875"							1 7/8"	1.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
		1 1/2"	2.000"							2"	1.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
		1 5/8"	2.000"							2"	1.625"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
		1 3/4"	2.250"							2 1/4"	1.750"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
		2"	2.500"							2 1/2"	2.000"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	0000
		2 3/8"	2.875"							2 7/8"	2.375"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		2 1/2"	2.875"							2 7/8"	2.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		2 1/2"	3.000"							3"	2.500"	1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000


		2 3/4"	3.250"	3 1/4"	2.750"					1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		3 1/2"	4.000"	4"	3.500"					1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000
		3 5/8"	4.125"	4 1/8"	3.625"					1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000




				For 0.550" Wide Grooves

				3 3/8"	4.000"	4"	3.375"			1.6	5,000	-65 to 300	Durometer 90A (Hard)	Black	Durometer 70A (Medium)	Black	00000000	00000

U-Cup Seals

These U-cup seals create less friction than O-ring-loaded U-cups, so they wear more slowly. Also known as lip seals, U-cups have a sealing lip on both the inside and outside edges, so they 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.

U-Cup Seals


Side 1	Side 2	Profile


Rod Installation	Piston Installation

	For Rod Sealing		For Piston Sealing
	For Rod Dia.	For Groove Dia.	For Bore Dia.	For Groove Dia.	Max. Speed, ft/sec	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color		Each
Buna-N







				For 0.093" Wide Grooves

				1/4"	0.375"	3/8"	0.250"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	00000


				5/8"	0.812"	13/16"	0.625"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000




						For 0.125" Wide Grooves

						1/4"	0.437"	7/16"	0.250"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000


						1/2"	0.750"	3/4"	0.500"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000
						5/8"	0.812"	13/16"	0.625"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
						3/4"	1.000"	1"	0.750"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000
						7/8"	1.125"	1 1/8"	0.875"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000
						1"	1.250"	1 1/4"	1.000"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000
						1 1/4"	1.500"	1 1/2"	1.250"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000




								For 0.156" Wide Grooves

								1/4"	0.562"	9/16"	0.250"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000


								3/8"	0.625"	5/8"	0.375"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
								1/2"	0.750"	3/4"	0.500"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
								5/8"	0.875"	7/8"	0.625"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
								3/4"	1.000"	1"	0.750"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
								7/8"	1.125"	1 1/8"	0.875"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
								1"	1.250"	1 1/4"	1.000"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
								1 1/8"	1.375"	1 3/8"	1.125"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
								1 1/4"	1.500"	1 1/2"	1.250"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
								1 3/8"	1.687"	1 11/16"	1.375"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000
								1 1/2"	1.812"	1 13/16"	1.500"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000


								1 3/4"	2.000"	2"	1.750"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000




										For 0.188" Wide Grooves

										7/8"	1.250"	1 1/4"	0.875"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000


										1"	1.312"	1 5/16"	1.000"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
										1 1/8"	1.437"	1 7/16"	1.125"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
										1 1/4"	1.562"	1 9/16"	1.250"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
										1 3/8"	1.687"	1 11/16"	1.375"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
										1 1/2"	1.812"	1 13/16"	1.500"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
1 3/4"										2.125"	2 1/8"	1.750"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000
2"	2.375"									2 3/8"	2.000"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000




		For 0.218" Wide Grooves

		3/4"	1.125"							1 1/8"	0.750"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000


		1 3/8"	1.750"							1 3/4"	1.375"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
		1 1/2"	1.875"							1 7/8"	1.500"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
		1 5/8"	2.000"							2"	1.625"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
		1 3/4"	2.125"							2 1/8"	1.750"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
		1 7/8"	2.250"							2 1/4"	1.875"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
		2"	2.375"	2 3/8"						2.000"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
		2 1/4"	2.625"	2 5/8"	2.250"					1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
		2 1/2"	2.875"	2 7/8"	2.500"					1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
		2 3/4"	3.125"	3 1/8"	2.750"					1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
		3"	3.375"	3 3/8"	3.000"					1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000




				For 0.250" Wide Grooves

				1 3/8"	1.875"					1 7/8"	1.375"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000


				1 1/2"	2.000"					2"	1.500"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000
				1 3/4"	2.250"					2 1/4"	1.750"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000
				2"	2.500"	2 1/2"				2.000"	1	120	-20 to 212	Durometer 70A (Hard)	Black	0000000	0000
				2 1/2"	2.937"	2 15/16"	2.500"			1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
				2 3/4"	3.187"	3 3/16"	2.750"			1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000
				3"	3.437"	3 7/16"	3.000"			1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000




						For 0.281" Wide Grooves

						2 1/2"	3.000"			3"	2.500"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	0000




										For 0.406" Wide Grooves

										2 1/4"	3.000"	3"	2.250"	1.6	250	-40 to 250	Durometer 80A (Hard)	Black	00000000	00000

AN6226 U-Cup Seals


Side 1	Side 2	Profile


Rod Installation	Piston Installation

	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	Hardness	Color	Pkg. Qty.		Pkg.
Buna-N







				For 0.282" Wide Grooves

				1/4"	0.750"	3/4"	0.250"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	00000


				3/8"	0.875"	7/8"	0.375"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
				1/2"	1.000"	1"	0.500"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
				5/8"	1.125"	1 1/8"	0.625"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
				3/4"	1.250"	1 1/4"	0.750"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
				7/8"	1.375"	1 3/8"	0.875"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
				1"	1.500"	1 1/2"	1.000"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
				1 1/8"	1.625"	1 5/8"	1.125"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
				1 1/4"	1.750"	1 3/4"	1.250"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000




						For 0.344" Wide Grooves

						1 1/4"	1.875"	1 7/8"	1.250"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000


						1 3/8"	2.000"	2"	1.375"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
						1 1/2"	2.125"	2 1/8"	1.500"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
						1 5/8"	2.250"	2 1/4"	1.625"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
						1 3/4"	2.375"	2 3/8"	1.750"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
						1 7/8"	2.500"	2 1/2"	1.875"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	0000
						2"	2.625"	2 5/8"	2.000"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	00000
						2 1/4"	2.875"	2 7/8"	2.250"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	00000
						2 3/8"	3.000"	3"	2.375"	Not Rated	120	-20 to 212	Durometer 70A (Hard)	Black	5	0000000	00000

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

Cupped Piston Seals


Side 1	Side 2	Profile

These Buna-N seals are reinforced with cotton thread for strength.

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

		Seal
	For Bore Dia.	ID	OD	Wd.	Max. Pressure, psi	Temp. Range, ° F	Color		Each
Buna-N with Cotton Fabric Embedded Thread



		1 1/2"	0.375"	1.500"	0.500"	1,000	-40 to 250	Black	0000000	00000


		1 1/2"	0.750"	1.500"	0.500"	1,000	-40 to 250	Black	0000000	0000
		2"	0.375"	2.000"	0.500"	1,000	-40 to 250	Black	0000000	0000
		2"	0.500"	2.000"	0.500"	1,000	-40 to 250	Black	0000000	0000
		2"	0.625"	2.000"	0.500"	1,000	-40 to 250	Black	0000000	0000
		2"	0.750"	2.000"	0.500"	1,000	-40 to 250	Black	0000000	0000
		2 1/2"	0.375"	2.500"	0.500"	1,000	-40 to 250	Black	0000000	0000
		2 1/2"	0.750"	2.500"	0.500"	1,000	-40 to 250	Black	0000000	0000
		3"	0.625"	3.000"	0.625"	1,000	-40 to 250	Black	0000000	00000
		3"	1.000"	3.000"	0.625"	1,000	-40 to 250	Black	0000000	00000
		3 1/2"	0.750"	3.500"	0.625"	1,000	-40 to 250	Black	0000000	00000


		5"	1.000"	5.000"	0.750"	1,000	-40 to 250	Black	0000000	00000
		6"	0.500"	6.000"	0.750"	1,000	-40 to 250	Black	0000000	00000
		6"	2.750"	6.000"	0.750"	1,000	-40 to 250	Black	0000000	00000