O-ring SCHAERER Spare Parts 065192 3370065192

An O-ring is a circular seal that sits in a groove between two mating surfaces. It is compressed when the parts are assembled, blocking the passage of liquids or gases. The material and cross-section are chosen so that the ring fills the gap without extruding under pressure, maintaining a leak-proof joint throughout temperature cycles and mechanical movement.

This O-ring is sized 3.68 mm inside diameter by 1.78 mm cross-section and is moulded from VMQ (silicone) with a Shore A hardness of 60. The silicone compound resists hot water, steam and coffee oils, and remains flexible across the temperature range found in espresso machines and water boilers. The round profile ensures even pressure around the entire circumference, preventing leaks at any point.

To fit, the old O-ring is removed from its groove, the new one is stretched over the component and seated into the channel. No adhesive is required; the elasticity of the silicone holds it in place once the mating part is tightened. Regular inspection for cracks or permanent deformation is recommended, as wear reduces the sealing force over time.

The part is a direct replacement for SCHAERER coffee equipment where the original O-ring matches the 3.68x1.78 VMQ 60 Sh A rd specification.