High-Precision Ball Bearings Product Catalog
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HIGH-PRECISION BALL BEARINGS High-Precision Ball Bearings Product Catalog

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Designation system of radial ball bearings – metric / inch Retaining ring Designation system of radial ball bearings – metric / inch Retaining ring Balls Outer ring Shoulder flattened Outer ring Inner ring Ring material Basic mark Ball material Contact angle Radial clearance Diameter grading Functional test Pairing type Preload value Retainer design Steel balls SS X65Cr13 Ceramic SV X30CrMoN15-1 balls made from S 440C Si3N4 SA Antimagnetic ZO Ceramic material balls made from Combination balls ZrO2 N Full ceramic bearings (balls, IR,...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Contents Profiled rollers Bearing units Thin-section bearings Hybrid and full ceramic ball bearings Special ball bearings Coated bearings Retainers for miniature ball bearings GRW Modular System Materials for rings and balls Fundamentals of Ball Bearing Design Shaft and housing shoulders GRW XTRA TRA A XTRA - Enhancing Performance XTRA t XTRAcoat - The new GRW coating system 81 XTR XTRAlube XTRAlube - The lubrication for longer life XTRAl XTRAlon - The premium retainer material ur XTRA Your success with GRW XTRA bearings Special...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS As a global corporation with more than 500 employees, GRW is headquartered in Rimpar, near Würzburg, with assembly facilities in Prachatice (Czech Republic) and a direct sales office in the USA. Our radial ball bearings range in bores from 1 mm to 35 mm with outer diameters from 3 mm to 47 mm meeting any condition from mini series to high volume standard applications. GRW is the premier developer and manufacturer of miniature precision ball bearings, assemblies and accessory parts utilizing state-of-the-art equipment and manufacturing...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Materials for rings and balls GRW ball bearings are manufactured by using technological advancements in steel production and heat treatment. Our ball bearings are made of chrome steel (100Cr6), stainless steel (X65Cr13), or high corrosionresistant steel (X30CrMoN 15-1). It is now possible to achieve comparable load ratings for all these steel types. Ceramic balls, e.g. hybrid ball bearings, can be used in all versions as required by your application. Hybrid ball bearings GRW hybrid, or ceramic ball bearings are made of one of the...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Retainers for miniature ball bearings Retainers are vital for efficient operation of ball bearings. First, they keep the balls separated and evenly spaced, ensuring a uniform distribution of load and thereby reducing heat while enhancing the bearing life expectancy. Secondly, the retainer guides the balls in the loadfree zone and prevents the balls from dropping out of separable bearings. Using our customized designs and materials, retainers can be manufactured to meet any application. We recommend usage of a two-part ribbon retainer...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Lubricants Why do bearings need lubricants? Miniature ball bearings are perfect for high stress environments, but require special lubricants to minimize wear, in order to increase operational life, performance, and safety of the product. GRW lubricants provide permanent lubrication to minimize sliding friction between balls, rings and retainer. This prevents excessive wear and thermal overheating, protecting balls and raceway from micro-welding and thereby extending operational life while reducing running noise. The bearing...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Shaft and housing shoulders Certain design and assembly factors are critical for optimum performance of bearings. For instance, shaft and housing shoulders should accurately allow axial load to be transferred to the inner and outer ring without permitting the rings to tilt in opposite directions. The associated dimension tables provide limits for the largest (da max) and the smallest (da min) permissible shoulder diameter for the inner ring and the largest permissible shoulder diameter for the outer ring (Da max). See Dimension...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Fitting tolerances Among other factors, the fit of the bearing on the shaft and in the housing significantly affects the operational behavior of miniature ball bearings. When selecting fitting tolerances the following criteria should be considered: Rotation conditions Rings with circumferential loading should have a tighter fit than rings with a single point load. Circumferential loading occurs when the ring is rotating and the load is static, or when the ring is static and the load is rotating. Point loading occurs when the rings and...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Load ratings and L-10 life The static radial load rating C0r The basic static radial load rating (C0r) applies to bearings which rotate at very slow speeds, which are subjected to slow oscillations or are stationary under load. Per DIN ISO 76, the basic static radial load rating is the static radial load corresponding to a calculated contact stress of 4200 N/ mm2 at the center of the contact ellipse of the most heavily loaded ball or raceway. If the contact pressure exceeds this maximum permissible value, plastic deformation will...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Limiting speeds Elastic behavior of deep groove radial bearings Various mechanical and kinematic factors impact the maximum operational speed of a bearing. The following factors can have an effect on the limiting speed: • Retainer load Thermal reference speed The thermal reference speed (nθr) defines the speed of the inner ring at which a balance is achieved between the heat generated in the bearing by torque and the heat flow dissipated through the shaft and housing. • Noise • Rolling kinematics For the standardized calculation method...