Seals for 1 7/8" Shafts | McMaster-Carr

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Diluted Salt Solutions

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Sealol Type 43 CE Long

Sealol Type 43 CE Short

Sealol Type 43 CU Short

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Viton® Fluoroelastomer

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11 Products

Heavy Duty Shaft-Mounted Rotary Shaft Seals


Side 1	Side 2	Profile

These seals are fluoroelastomer, so they have excellent chemical resistance and withstand temperatures up to 390° F. Also known as V-rings and flingers, they protect shaft bearings by blocking dust and other contaminants while retaining lubricant. To install, stretch the seal over your shaft and press it firmly against the face plate.

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

	For Shaft			Seal
	Dia.	Dia. Range	For Faceplate Dia.	ID	OD	Wd.	Max. Rotation Speed, rpm	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color		Each
Fluoroelastomer



		1 3/4", 1 7/8"	1.693" to 1.89"	2.283" to 2.480"	1.575"	1.969"	0.354"	3,800	5	5 to 390	Durometer 60A (Medium)	Brown	1670N23	000000

Spring-Loaded Rotary Shaft Seals with Wiper Lip


Side 1	Side 2	Profile

Used to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes, these seals have a secondary lip that blocks contaminants. Also known as oil seals, a spring secures the lip against the shaft, preventing messy leaks. Press-fit seals into the bore around the shaft. Seals with a maximum pressure of 50 psi should be secured with a retaining ring.

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

Acrylic-Coated Case—Seals with an acrylic-coated case have a coating that compensates for surface imperfections in the housing bore for a tight seal on the OD.

		Seal			For Bore							Case
	For Shaft Dia.	ID	OD	Wd.	Dia.	Min.Wd.	Max. Rotation Speed, rpm	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color	Finish	Color	Specs. Met		Each
Buna-N with Steel Case and Steel Spring



		1 7/8"	1.875"	2.875"	0.313"	2.875"	0.329"	3,000	10	-40 to 210	Durometer 80A (Hard)	Black	Acrylic Coated	Green	DIN 3760, ISO 6194	5154T844	000000

High-Speed Rotary Shaft Seals


Side 1	Side 2	Profile

A slippery PTFE surface allows these seals to function at speeds at least 25% faster than other rotary shaft seals. Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. An O-ring secures the lips to prevent leaks, while sealing against the housing. Press-fit seals into the bore around the shaft.

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

		Seal			For Bore							O-Ring
	For Shaft Dia.	ID	OD	Wd.	Dia.	Min.Wd.	Max. Rotation Speed, rpm	Max. Pressure, psi	Temp. Range, ° F	Hardness	Color	Hardness	Color		Each
Graphite Filled PTFE with Buna-N O-Ring



		1 7/8"	1.875"	2.375"	0.313"	2.375"	0.323"	10,200	150	-40 to 250	Durometer 60D (Extra Hard)	Black	Durometer 70A (Hard)	Black	2122N21	000000

Narrow-Profile Mechanical Pump Shaft Seals with Extended Spring

With a smaller seal OD than standard seals, these seals have an extended spring that accommodates variations in seal cavity length. They're used in waste water, boiler feed, and compressor pumps. Seals come furnished as two pieces—the seal and the seat. The seal is comprised of the case, spring, diaphragm, and washer, which come locked together as one piece. Seal Width represents the working height, which is the compressed length when installed. The seat is comprised of the seat and the gasket.

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

Cannot Be Sold Outside North America—Products cannot be sold outside North America due to restrictions.

				Seal			Seat			Material
	For Shaft Dia.	Mfr. Equiv. No.	Mfr./Brand Equiv.	ID	OD	Wd.	ID	OD	Wd.	Washer	Seat	Max. Pressure, psi	Cannot Be Sold To		Each
316 Stainless Steel Case and 316 Stainless Steel Spring with Buna-N Diaphragm and Buna-N Gasket



		1 7/8"	523	John Crane Type 1 Pac-Seal Type 51 Sealol Type 43 CE Long	1.875"	2.437"	2.125"	1.927"	2.625"	0.500"	Carbon	Ceramic	150	Outside North America	9281K488	0000000

Split Rotary Shaft Seals


Side 1	Side 2	Profile

Replace old seals without disassembling components—these seals come split for easy installation. Also known as clipper seals, they retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. A spring secures the lip to prevent leaks; fasten the hook and eye closure to secure. Press-fit seals into the housing bore; they fit tight for installation without a cover plate.

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

		Seal			For Bore
	For Shaft Dia.	ID	OD	Wd.	Dia.	Min.Wd.	Max. Rotation Speed, rpm	Max. Pressure	Temp. Range, ° F	Hardness	Color	Case Color		Each
Buna-N with Aramid Case and Stainless Steel Spring



		1 7/8"	1.875"	2.875"	0.438"	2.875"	0.438"	4,100	Not Rated	-20 to 250	Durometer 75A (Hard)	Black	Black	1651N21	000000

Mechanical Pump Shaft Seals with Extended Spring

Seal with Retainer

and Straight Spring

For use in waste water, boiler feed, and compressor pumps, these seals have an extra-long spring that accommodates variations in seal cavity length. They come furnished as two pieces—the seal and the seat. The seal is comprised of the case, spring, diaphragm, and washer, which come locked together as one piece. Seal Width represents the working height, which is the compressed length when installed. The seat is comprised of the seat and the gasket.

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

Buna-N Diaphragm—Buna-N diaphragms resist grease and a wide range of oils.

EPDM Diaphragm—EPDM diaphragms are more resistant to water and steam than Buna-N and Viton® fluoroelastomer, but aren’t as resistant to oils and chemicals.

Viton® Fluoroelastomer Diaphragm—Viton® fluoroelastomer diaphragms resist a wider range of chemicals than Buna-N.

Buna-N Gasket—Buna-N gaskets resist grease and a wide range of oils.

Viton® Fluoroelastomer Gasket—Viton® fluoroelastomer gaskets resist a wider range of chemicals than Buna-N.

Carbon Washer—Carbon washers are for use with clean liquids.

Cannot Be Sold Outside North America—Products cannot be sold outside North America due to restrictions.

				Seal			Seat			Material
	For Shaft Dia.	Mfr. Equiv. No.	Mfr./Brand Equiv.	ID	OD	Wd.	ID	OD	Wd.	Washer	Seat	Spring Shape	Includes	Max. Pressure, psi	Cannot Be Sold To		Each
304 Stainless Steel Case and 304 Stainless Steel Spring with Buna-N Diaphragm and Buna-N Gasket



		1 7/8"	340	John Crane Type 21 Pac-Seal Type 21 Pac-Seal Type 31 Sealol Type 43 CE Short Sealol Type 43 CU Short	1.875"	2.519"	1.500"	1.927"	2.625"	0.500"	Carbon	Ceramic	Straight	Spring Retainer	250	Outside North America	9281K482	000000


		304 Stainless Steel Case and 304 Stainless Steel Spring with Viton® Fluoroelastomer Diaphragm and Viton® Fluoroelastomer Gasket



				1 7/8"	340V	John Crane Type 21 Pac-Seal Type 21 Pac-Seal Type 31 Sealol Type 43 CE Short Sealol Type 43 CU Short	1.875"	2.519"	1.500"	1.927"	2.625"	0.500"	Carbon	Ceramic	Straight	Spring Retainer	250	Outside North America	9281K81	000000


				304 Stainless Steel Case and 304 Stainless Steel Spring with EPDM Diaphragm and EPDM Gasket



						1 7/8"	340E	John Crane Type 21 Pac-Seal Type 21 Pac-Seal Type 31 Sealol Type 43 CE Short Sealol Type 43 CU Short	1.875"	2.519"	1.500"	1.927"	2.625"	0.500"	Carbon	Ceramic	Straight	Spring Retainer	250	Outside North America	9281K302	000000

Cartridge Mechanical Shaft Seals

Install these seals faster and with less technical expertise than other mechanical shaft seals that come in two pieces. They come with their seal and seat already assembled. All have a carbon washer that is self-lubricating. However, this means their washer is too soft to be used with abrasive liquids and liquids with harsh additives.

Fluoroelastomer Diaphragm—Seals with a fluoroelastomer diaphragm can be used with a wider range of chemicals than EPDM diaphragms, including benzene, butyl alcohol, and fuels.

EPDM Diaphragm—Seals with an EPDM diaphragm won’t break down from exposure to water and steam. However, they are for use with fewer chemicals.

		Seal				Fluoroelastomer Diaphragm		EPDM Diaphragm
	For Shaft Dia.	ID	OD	Wd.	Max. Pressure, psi		Each		Each
316 Stainless Steel Case and C276 Nickel Spring with PTFE Gasket



		1 7/8"	1.875"	3.874"	2.815"	220	4887N18	000000000	4887N43	000000000

Shaft Repair Sleeves

Also known as speedi sleeves, use these to repair and protect worn shafts for a smooth sealing surface without machining. Each sleeve comes with an installation tool. To install, place the installation tool around the sleeve and gently tap the installation tool until the sleeve covers the worn shaft surface.

	For Shaft				Flange
	Dia.	Dia. Tolerance	Max. Installed Dp.	Sealing Face Wd.	OD	Wd.	Sleeve Thk.		Each
300 Series Stainless Steel



		1 7/8"	1.872" to 1.878"	1.000"	0.563"	2.203"	0.125"	0.011"	5187T21	000000