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 Designation system of radial ball bearings - metric / inch - Steel balls HY Cera mic balls made from SS X65Cr13 SV X30CrMoN15-1 S 440C SA Antimagnetic material Combination balls N Full ceramic bearings (balls, IR, AR ) of silicon nitride NZ Full ceramic bearings (balls, IR, AR) made from zirconium oxide Further materials available on request LE Bearing unit F Flange E Extended inner ring - Open ball bearings -2Z Double shield -RZ Single Perbunan rubber shield, non-contact -RS...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Service Test equipment - Orakel III / GRW Modular System Materials for rings and balls Closures Retainers for miniature ball bearings Lubricants Fundamentals of Ball Bearing Design Shaft and housing shoulders Special installation configurations Fitting tolerances Load ratings and L-10 life Limiting speeds Elastic behavior of deep groove radial bearings Relationship between radial play, axial play, contact angle and tilting angle Calibration of bore and outside diameters Reduction in radial play Radial play classification Functional tests...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Our Company GRW... the premier provider for customized high-precision ball bearing solutions. 2003 Formation of GRW USA 2001 Reorganization of the corporate strategy in terms of in-house production and cooperative production 1998 Restructuring in the Czech Republic As a global corporation with more than 500 employees, GRW is headquartered in Rimpar, near Wurzburg, with assembly facilities in Prachatice (Czech Republic) and a direct sales office in the USA. GRW is the premier developer...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS (1) May contain magnetic parts for production technology reasons Our sales engineers will gladly inform you about the chemical resistance properties of the materials. Subject to change. 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 (10006), stainless steel (X65Cr13), or high corrosion-resistant steel (X30CrMoN 15-1). It is now possible to achieve...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS See the following list for our range of different retainer variants: As not every retainer is available for all sizes, please contact us for additional information. We will gladly recommend other bearing and retainer designs as well as retainer materials for special requirements. 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...

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 application...

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 Tables...

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 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...

HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS HIGH-PRECISION BALL BEARINGS Elastic behavior of deep groove radial bearings Limiting speeds 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 • Noise • Rolling kinematics • Lubrication • Heat generated by friction and the environment • Inner ring slippage and radial play reduction Retainer loading In miniature bearings, the speed limit can be determined among other factors by the retainer...