Precision crossed roller bearings are essential components in applications requiring high rotational accuracy, stiffness, and the ability to handle combined loads (radial, axial, and moment). Their performance is defined by a series of accuracy grades, primarily specified by ISO standards.
Precision Crossed Roller Bearings ISO Accuracy Grades
The most common international standard for bearing accuracy is ISO 492, which classifies bearings into a series of grades. The higher the grade number, the tighter the tolerances and the higher the precision. For precision bearings, the key grades are:
P0 (Normal): This is the most basic accuracy grade. While it’s suitable for general industrial applications where high precision is not a priority, it is generally not considered a “precision” grade.
P6: A higher precision grade than P0. It is often used for applications with a moderate need for accuracy, such as in standard machine tools and electric motors.
P5: This is the first true “precision” grade. It has a significantly tighter tolerance range than P6 and is a popular choice for high-precision equipment like the drive shafts of precision machine tools and some robotic joints.
P4: A “super precision” grade. P4 bearings have extremely stringent requirements for geometric and rotational accuracy. They are used in high-end applications like the spindles of precision grinders, jig boring machines, and measurement instruments.
P2: This is the highest and most precise grade, often referred to as “ultra-high precision.” P2 bearings are used in highly specialized equipment where the utmost accuracy is required, such as in optical equipment, high-end measuring tools, and aerospace components.
Key Parameters that Define Accuracy Grade
The accuracy grade is a comprehensive classification that encompasses several critical dimensional and geometric tolerances:
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More detailed information about the accuracy grades of precision crossed roller bearings can be found at:https://www.lynicebearings.com/a/blog/precision-crossed-roller-bearings-accuracy-grades.html
