18mm Shaft Diameter Shaft Seals

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Diluted Salt Solutions

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Manufacturer/Brand Equivalent

John Crane Type 21

Pac-Seal Type 21

Pac-Seal Type 31

Sealol Type 43 CE Short

Sealol Type 43 CU Short

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DFARS Specialty Metals

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2 Products

Shaft-Mounted Rotary Shaft Seals


Side 1	Side 2	Profile

Also known as V-rings and flingers, these seals protect shaft bearings by blocking dust and other contaminants while retaining lubricant. They’re Buna-N for excellent resistance to oil and grease. To install, stretch the seal over your shaft and press it firmly against the faceplate. The Seal OD and Seal Width listed are the dimensions of the seal after it is installed.

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

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



		18	17.500 to 19.000	17.500 to 19.000	16.000	22.000	3.000	6,900	5	-40 to 212	Durometer 60A (Medium)	Black	00000000	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.

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



		18	John Crane Type 21 Pac-Seal Type 21 Pac-Seal Type 31 Sealol Type 43 CE Short Sealol Type 43 CU Short	18.000	30.700	22.250	19.700	35.000	10.250	Carbon	Ceramic	Straight	Spring Retainer	250	Outside North America	00000000	000000