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End Cap CS-10

The CS-10 end cap is a static sealing solution used to permanently close open bores in metal housings. This type of seal is applied in situations where no shaft passage is present, or where an existing shaft opening has been taken out of service. Unlike radial shaft seals, a CS-10 end cap involves no dynamic movement: the seal completely closes the bore and prevents leakage of oil or grease, while simultaneously blocking external influences such as dust, moisture, and splash water. Thanks to its simple press-fit installation, the CS-10 end cap provides a robust and maintenance-free solution for a wide range of industrial applications.

This end cap CS-10 is also known as GA, YJ38, VK, VER and EC.

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Product Id	Type	Outer Diameter	Height	Material	Housing Material	Color	Stock	Price
25759	End Cap	170	13	NBR - Nitrile	Steel	Black	247	€ 16,75	Details
25760	End Cap	225	14	NBR - Nitrile	Steel	Black	156	€ 33,49	Details
25761	End Cap	130	8	NBR - Nitrile	Steel	Black	1008	€ 10,70	Details
25762	End Cap	98	6	NBR - Nitrile	Steel	Black	180	€ 7,01	Details
25763	End Cap	160	16	NBR - Nitrile	Steel	Black	90	€ 15,19	Details
25764	End Cap	168	15	NBR - Nitrile	Steel	Black	478	€ 16,75	Details

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Construction and design of the CS-10 end cap

The CS-10 end cap consists of a steel reinforcement ring that is fully covered with a vulcanised elastomer outer jacket. The steel core ensures dimensional stability and mechanical strength during installation and operation, particularly with the required press fit in the bore. As a result, the end cap retains its geometry even under thermal loads or vibrations.
The elastomer outer jacket provides the actual sealing against the bore wall. Thanks to the rubber layer, the end cap CS-10 can compensate for small deviations in roundness, surface finish, and dimensional tolerances, creating a reliable static seal. The seal contains no spring, lip, or moving parts, which eliminates wear and contributes to a long service life.

End Cap CS-10 - Schematic overview of a CS-10 End Cap

Typical applications and why the CS-10 is suitable

CS-10 end caps are widely used in bearing housings, gearboxes, transmissions, motor reducers, and pump housings. They are ideal for sealing unused shaft openings or inspection bores. In bearing blocks, for example, they are used to completely close the side without a shaft, keeping grease inside and contamination out.
The end cap CS-10 is particularly suitable for these applications because it provides a fully closed seal without complex installation or additional components. The combination of a rigid metal core and a flexible sealing layer makes the end cap resistant to vibrations and slight thermal expansion, while remaining leak-free at low or no pressure. This makes the CS-10 type a logical alternative to cover plates or flanges in compact designs.

Material selection: properties, advantages, and limitations

The CS-10 end cap is available with different elastomer qualities, selected according to temperature, media, and environmental conditions.

NBR (nitrile rubber)

NBR is the standard material for most applications. It offers good resistance to mineral oils and greases and has a favourable temperature range for general industrial environments. NBR is flexible, wear-resistant, and cost-efficient. A limitation is its reduced resistance to high temperatures, ozone, and aggressive chemicals.

End Cap CS-10 - Product view of a CS-10 End Cap

FKM (fluoroelastomer)

FKM is used when higher temperatures, synthetic oils, fuels, or chemical media are involved. This material provides excellent thermal and chemical resistance and shows minimal ageing. A disadvantage of FKM is its reduced flexibility at low temperatures and its generally higher cost.
The choice between NBR and FKM is determined by the operating temperature, the medium to be sealed, and the desired service life of the seal.

Material table

Material	Temperature range (indicative)	Key properties
NBR (Nitrile rubber)	approx. −30 °C to +100 °C	Good resistance to mineral oils and greases, flexible, wear-resistant, and cost-efficient. Suitable for general industrial applications. Less suitable for high temperatures, ozone exposure, and aggressive chemicals.
FKM (Fluoro rubber)	approx. −20 °C to +200 °C	Excellent resistance to high temperatures, synthetic oils, fuels, and chemicals. Very good ageing and ozone resistance. Less flexible at low temperatures and higher cost than NBR.

Selecting the right CS-10 end cap: dimensions, standards, and tolerances

When selecting the correct CS-10 end cap, bore diameter, installation depth, and material choice are decisive. The outer diameter of the end cap must exactly match the bore into which it is press-fitted. For a reliable press fit, a bore with ISO tolerance H8 is recommended.
The height of the end cap must fit within the available installation space and provide sufficient axial support. Many CS-10 end caps are dimensionally aligned with standard oil seal sizes, allowing easy use in existing designs.
In addition, the selected elastomer must be suitable for the temperature, the medium, and the environmental conditions. Since the end cap CS-10 is a static seal, it is not suitable for applications involving rotation or pressure build-up; this should be taken into account during the design phase.

Cross Reference

Anyseals	Simrit (Freudenberg)	Trelleborg	Forsheda / Stefa	Dichtomatik	Taiwan / China
CS-10	GA	YJ38	VK	VER	EC

In summary, the CS-10 End Cap is a reliable sealing solution that provides secure closure and effective sealing for bores, bearings, and shaft feedthroughs. Its utilization of highly resistant materials, wide temperature range, and customizable design options make it an ideal choice for various applications. Whether it's sealing transmissions, bearing blocks, split housings, or light metal housings, the CS-10 ensures reliable performance and protects against leaks and contamination. Trust in the CS-10 End Cap for secure closure and superior sealing performance in your applications.

I you want more information or do you have any questions about the CS-10? feel free to contact us.

FAQ: CS-10 end caps

What is the difference between a CS-10 end cap and an oil seal?

A CS-10 end cap completely closes a bore without a shaft passage and is static. An oil seal provides dynamic sealing around a rotating shaft.

Is a CS-10 end cap suitable for pressure applications?

No, the end cap CS-10 is intended for static sealing at low or no pressure.

Can a CS-10 end cap be reused after removal?

No, due to the press fit the end cap may deform during removal. Reuse is not recommended.

Which bore tolerance is required for installation?

A bore with ISO tolerance H8 is recommended for reliable sealing.

Which material choice is suitable for high temperatures?

For higher temperatures and aggressive media, FKM is the best choice.

Are CS-10 end caps maintenance-free?

Yes, when correctly installed and applied, CS-10 end caps require no maintenance.

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