D-Rings
D-rings offer an alternative seal solution to O-rings used in reciprocating dynamic or rotary applications. They offer the same sealing characteristics as an O-ring, and can be used in both low and high pressure applications across a broad range of temperatures.
For low pressure applications, the combination of a low modulus material and small cross section can help to reduce friction. In high pressure applications, friction can be reduced by selecting a higher modulus material with a reduced coefficient of friction.
D-rings can be manufactured to standard O-ring sizes, as well as custom sizes for specific applications. They can typically be retrofitted into existing O-ring grooves, with the size often based around the original O-ring size.
PPE also manufactures D-rings to fit DIN 11851 fittings.
Why use elastomer D-rings instead of O-rings? expand_more

The flat geometry on the base of the D-ring stops the seal from twisting and rolling.
This prevents spiral failure often seen when O-rings are used in reciprocating applications.
Services Available
PPE has a range of services to help you get the most performance and reliability from your D-rings.
DIN11851 D-Seals
PPE material grades selection tool
Why do O-rings fail
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