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O-rings

O-rings


O-rings are circular sealing elements with a circular cross-section. The simplicity of the shape of an O-ring combined with the elasticity of the materials of which O-rings are made give the O-ring universal properties and make it the most widely used sealing element. O-rings can be produced from many different elastomer materials and a wide range of O-rings of standard materials is available from stock. The bandwidth of available O-rings is so wide and so closely graded that almost any application is covered. O-rings are standardized in DIN ISO 3601 (former DIN 3771).


Special properties

  • high operational reliability
  • small installation grooves
  • simple installation
  • cost-effective production
  • high availability


Materials

NBR, FKM, EPDM, VMQ, HNBR, FFKM, FVMQ, FEPM, ACM, CR, SBR, CSM, ECO, BR, IIR, IR, AU, EU, NR & seamless FEP-encapsulated (FKM / FEP encapsulated and VMQ / FEP encapsulated)


Applications

O-ring seals are used in all areas of industrial technology. The applications are divided into static applications (no relative movement between the sealed parts of a machine) and dynamic applications (the sealed parts of a machine move in relation to each other). The vast majority of O-ring are used for
static or slowly moving machine parts.


Designation

The common designation of an O-ring provides information on the inner diameter, the cross section, the material and the hardness.


Quality

The following delivery quality applies to all standard O-rings for which no other special arrangement has been made:

  • tolerances according to DIN ISO 3601-1 class B (former DIN 3771-1) form and surface deviations according to DIN ISO 3601-3 type feature N (former DIN 3771-4 type feature N)
  • acceptable quality level DIN ISO 2859-1 AQL 1.5


Tolerances

Inner diameter tolerances 

according to DIN ISO 3601-1 class B (former DIN 3771-1)
The inner diameter tolerances in the table below were calculated using the formula according to DIN ISO 3601-1:
Δd1 = ± [( d10,95 x 0,009) + 0,11]

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