SKF HMV 34/233983 O-Ring replacement partBack-up rings prevent O-rings from gap extrusion in static radial sealingO-rings are used in a wide variety of applications sealing various media O-Ring for HMV 34 Hydraulic Nut O-rings are one of the most common sealing solutions. SKF supplies O-rings in a wide range of sizes and different materials, which make them appropriate for a wide variety of operating conditions and applications. They are easy to install and they enable a simple and cost effective seal housing design.O-rings maintain sealing contact force by radial or axial deformation in the seal housing between two machine components. The most important criteria that influence the maximum operating pressure at which O-rings in static radial sealing can be used are the following:Extrusion gapMaterialSealed fluidTemperatureUnder specific conditions, there is a risk for gap extrusion. Back-up rings prevent O-rings from gap extrusion in static radial sealing. O-rings are used in a wide variety of applications sealing various media. This catalogue focuses on sealing systems for hydraulic cylinders. Therefore, this chapter and provided recommendations apply to static sealing of common mineral-based hydraulic fluids. Designations The designations of SKF O-rings (table 1) in both metric and inch sizes contain their dimensions in metric units.The designations of SKF back-up rings (table 2) in metric sizes contain their dimensions in metric units, whereas those in inch sizes contain their dash-number.The product tables for both are provided in inch and metric sizes. If applicable, the unique dash-numbers for O-ring sizes in accordance with standards AS586 and ISO 3601 are also listed there. Materials The O-rings listed in this catalogue are made of nitrile rubber (NBR) with 70 shA hardness as standard. This is the most common O-ring material and hardness used in hydraulic cylinder applications.

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