Optimized Grades of Precision
Superior Bearings from Timken Dimensional tolerance limits 100 times finer than a human hair (and for ultra-critical requirements: less than a single micron) are consistently reached with state of the art manufacturing technology pioneered through the Timken, Torrington and Fafnir brands. For over 50 years, Timken has produced a wide range of machine tool precision class bearings delivering superior accuracy and operation control for critical applications. The Timken Company offers a wide range of advanced engineered products with specific value-added features designed to meet our customers’ application requirements. This includes a full line of bearing types of the highest industry precision levels in ball bearings, tapered roller bearings and crossed roller bearings.
Bearing Selection
the balls’ conformance to sphericity; race and ball surface finish; waviness of contact areas; preload offset tolerance; cleanliness; calibration of envelope dimensions; matching of bearings within a set; cage design and material; lubricant; radial play; contact angle and precision of ball complement are not defined by ABEC/ISO. All have a direct impact on the service life and performance of a bearing. The lack of a comprehensive standard allows inferior bearings to be marketed as ABEC7 (or 9)/ISO P4 (or P2) without the ability to produce superior performance. All Timken MM, MMV, and MMX precision grades comply with strict controls over these non-specified parameters, to provide premium performance.
MM, MMV –␣ Super Precision, Super High Precision (ABEC7/9; ISO P2/P4) Super precision bearings manufactured to the MM(V) tolerance class operate with running accuracy and performance levels meeting ABEC9 (ISO P2) yet maintain noncritical features at ABEC7 (ISO P4) level for cost-effectiveness. Bore and O.D. surfaces are coded in micron units for the convenience of the discriminating machine tool builder striving for optimum fitting of crucial spindle components. MMX – Ultraprecision (ABEC9, ISO P2) Super Precision bearings with closer tolerances and running accuracies than ABEC7 (ISO P4) bearings are made to ABEC9 (ISO P2) tolerances. Bearings produced to these tolerances are generally used on ultrahigh speed grinding spindles designed for tight dimensional tolerances and super-fine surface finishes. Contact your local Timken Sales Engineer for availability of product range.
The Timken Difference The impact of advancements in Timken Super Precision bearing technology cannot be overstated. Consider the vast differences in the quality, efficiency, and precision in industries such as the automobile and computer hardware over the past twenty years. The driving forces in these and many other industries have leveraged the incremental improvements seen in Super Precision bearings to their advantage. The significantly enhanced running accuracy of the machines used to manufacture everything from finished engine blocks to ultra-precise laser disk drives enable industrialized nations to enjoy a standard of living and accessibility unimagined only a generation ago. Timken truly helps shape the world of tomorrow, today.
Timken Super Precision Bearings / 19
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