Seals for 25mm Shafts | McMaster-Carr

Filter by

System of Measurement

Seal OD

Seal ID

Seal Width

Bore Diameter

For Use With

Diluted Salt Solutions

Color

Maximum Rotation Speed

Case Material

Hardness Rating

Loaded Type

Maximum Pressure

For Minimum Bore Width

Material

For Sealing

Reinforcement Type

Maximum Temperature

For Shaft Motion

Hardness

Spring Material

Minimum Temperature

RoHS

REACH

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Exempt

Forward

How can we improve?

18 Products

Bore-Sealing Spring-Loaded Rotary Shaft Seals with Wiper Lip


Side 1	Side 2	Profile

Ribbed Buna-N over steel creates a tight seal with the bore, even when mating with a rough surface or in a split housing. Also known as oil seals, these retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. They have a secondary lip that blocks contaminants and a spring that secures the sealing-lip to prevent leaks. Press-fit seals into the bore around the shaft. Seals with a maximum pressure of 145 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.

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



		25	25.000	35.000	7.000	35.000	7.300	10,500	7	-40 to 210	Durometer 75A (Hard)	Gray	DIN 3760, ISO 6194	0000000	00000


		25	25.000	38.000	7.000	38.000	7.300	10,500	7	-40 to 210	Durometer 75A (Hard)	Gray	DIN 3760, ISO 6194	0000000	0000
		25	25.000	40.000	7.000	40.000	7.300	10,500	7	-40 to 210	Durometer 75A (Hard)	Gray	DIN 3760, ISO 6194	0000000	0000
		25	25.000	47.000	7.000	47.000	7.300	10,600	7	-40 to 210	Durometer 75A (Hard)	Gray	DIN 3760, ISO 6194	00000000	0000
		25	25.000	52.000	8.000	52.000	8.300	10,500	7	-40 to 210	Durometer 75A (Hard)	Gray	DIN 3760, ISO 6194	0000000	0000

Rotary Shaft Seals for Grease


Side 1	Side 2	Profile

Also known as grease seals, these are designed to retain thick lubricant at low pressure in motors, pumps, bearings, and gearboxes. They have a light grip on the shaft that creates less friction than spring-loaded seals. 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, mm			For Bore, mm
	For Shaft Dia., mm	ID	OD	Wd.	Dia.	Min.Wd.	Max. Rotation Speed, rpm	Max. Pressure	Temp. Range, ° F	Hardness	Color		Each
Buna-N with Steel Case



		25	25.000	32.000	4.000	32.000	4.300	7,600	Not Rated	-20 to 212	Durometer 70A (Hard)	Black	00000000	00000


		25	25.000	35.000	4.000	35.000	4.300	7,600	Not Rated	-20 to 212	Durometer 70A (Hard)	Black	00000000	0000

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.

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



		25	25.000	40.000	7.000	40.000	7.300	7,600	7	-20 to 212	Durometer 70A (Hard)	Black	DIN 3761, ISO 6194	00000000	00000


		25	25.000	47.000	7.000	47.000	7.300	7,600	7	-20 to 212	Durometer 70A (Hard)	Black	DIN 3761, ISO 6194	00000000	0000
		25	25.000	52.000	7.000	52.000	7.300	7,600	7	-20 to 212	Durometer 70A (Hard)	Black	DIN 3761, ISO 6194	00000000	0000

Spring-Loaded Rotary Shaft Seals


Side 1	Side 2	Profile

Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. 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, mm			For Bore, mm							Case
	For Shaft Dia., mm	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



		25	25.000	35.000	7.000	35.000	7.300	3,800	10	-40 to 210	Durometer 75A (Hard)	Black	Acrylic Coated	Green	DIN 3760, ISO 6194	0000000	00000


		25	25.000	38.000	7.000	38.000	7.300	3,800	10	-40 to 210	Durometer 75A (Hard)	Black	Acrylic Coated	Green	DIN 3760, ISO 6194	0000000	0000
		25	25.000	40.000	7.000	40.000	7.300	3,800	10	-40 to 210	Durometer 75A (Hard)	Black	Acrylic Coated	Green	DIN 3760, ISO 6194	0000000	0000
		25	25.000	52.000	8.000	52.000	8.300	3,800	10	-40 to 210	Durometer 75A (Hard)	Black	Acrylic Coated	Green	DIN 3760, ISO 6194	0000000	00000

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.

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

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, mm			Seat, mm			Material
	For Shaft Dia., mm	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



		25	John Crane Type 21 Pac-Seal Type 21 Pac-Seal Type 31 Sealol Type 43 CE Short Sealol Type 43 CU Short	25.000	39.200	25.500	26.500	41.250	11.000	Carbon	Ceramic	Straight	Spring Retainer	250	Outside North America	00000000	000000


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



				25	John Crane Type 21 Pac-Seal Type 21 Pac-Seal Type 31 Sealol Type 43 CE Short Sealol Type 43 CU Short	25.000	39.200	25.500	26.500	41.250	11.000	Carbon	Ceramic	Straight	Spring Retainer	250	Outside North America	00000000	00000

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



		25	25	66.7	69.5	220	0000000	000000000	0000000	000000000