![]() ![]() ![]() The ISO 286-1 and SIO 286-2 standards tolerance classes are commonly used to define the acceptable size range during the manufacturing, repair or refurbishment of the hydraulic and pneumatic cylinders. In fact, the variation sin dimensions of manufactured parts occur random within the tolerance range. Specification of the tolerances is important as well, as parts of the cylinders cannot be manufactured to exact dimensions, so acceptable range of variation must be defined. However hole basis systems are more frequently used. Shaft Basis System: The shaft size is kept constant and the size of the hole is varied. ![]() Hole Basis System: The hole size is kept constant and the size of the shaft is varied.There are two different systems that can be used for obtaining any desired type of fit Fits and limits are standardized according to the International Standard ISO 286-1 and ISO 286-2, which are Geometrical Product Specification (GPS) standards. While the fit is the degree of tightness or looseness between two mating components to perform the defined function, the limits are the two extreme permissible sizes of the dimensions between, which actual size of dimension is contained. That is why the sizing and tolerancing of such components become very important. In such systems parts need to fit together with the required clearance/interference or with transition (mix of clearance and interference fit), in order to perform the desired role and function. Hydraulic and pneumatic cylinders are complex mechanical systems. ![]()
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