Piston rings

Always 6+ million piston rings in stock!
As a family business, we have over more than 80 years of piston ring experience. During these 80 years, we have accumulated a large inventory of over 6 million piston rings. Whether you need rare or modern-day piston rings, you won't go wrong with us.

Always a solution

We supply piston rings in all sizes and types to customers worldwide. From automotive to industrial applications, we always have a suitable piston ring in our range.
And is the required piston ring not available in our range, we can still supply it to you through customization. So we always find a solution.
Need customization?
Why choose THN?
- Extensive experience: More than 80 years of industry and product knowledge at your service.
- Large stock: More than 6 million piston rings in stock.
- Family business, personal service: We value customer relationships and offer expert guidance and personal attention.
Piston ring materials, quality and applications
Piston rings are manufactured from many different materials, with cast iron and steel being the most common. Some more common materials are:
- Gray cast iron (incl. GG25)
- Nodular cast iron (incl. GGG50)
- Bronze (incl. CuSn7 and CuSn10)
- Steel (incl. 54SiCr6)
- Stainless steel (incl. X90CrMoV18)
For the most part, piston rings are produced to comply with DIN and ISO standards. Some of the more common standards are:
- ISO 662x series
- DIN 709xx series
- DIN 2491x series
Piston rings are found in all piston engines and in the majority of compressors and pumps. We also find piston rings in many other applications such as gearboxes, turbochargers and gasification plants. They provide a seal as well as lubrication and thermal conduction between the piston and the cylinder wall.
Piston ring types

Piston rings play an important part in combustion engines, and can be used as sealants for other applications. There are different types of piston rings, with each type having its own function: compression rings, scraper rings and oil control rings. A combination of these piston rings ensures combustion engines operate properly.
Piston ring typesPiston ring joints

Depending on the application, other piston rings can be used besides the standard joints. Besides the standard joint, piston rings can also be delivered with a hook joint, bevel joint, lap joint, gas-tight joint, side joint, inner joint and increased joint.
Piston ring options

For very specific applications, there for various options available for piston rings such as the piston ring with a broken inner or outer side and the piston ring with internal beveling or an internal recess.
Download piston ring brochure

Download the brochure in which you will find everything about our piston rings. You can read more about the function of piston rings in the brochure and there is an extensive overview of all piston ring types, lock types, options and coatings.
Download brochureNeed custom piston rings?

In the case of very specific applications, the necessary piston rings may not be in stock. We also offer options for specially produced piston rings in any desired size and design. Delivery times are possible from 24 hours.
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