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High-Precision Ball Bearings Product Catalog

High-Precision Ball Bearings Product Catalog
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High-Precision Ball Bearings Product Catalog

Product catalog summary
Overview: The document is a comprehensive catalog for high-precision ball bearings produced by GRW, detailing specifications, materials, and configurations available for various applications. It includes information on the company's history, product offerings, and technical specifications.
Company Background: GRW is a global leader in the development and manufacturing of miniature precision ball bearings, with headquarters in Rimpar, Germany, and facilities in the Czech Republic and the USA. The company is ISO certified and specializes in high-precision, small, and customized bearings.
Materials and Design: GRW ball bearings are made from advanced steel types such as chrome steel (100Cr6), stainless steel (X65Cr13), and high corrosion-resistant steel (X30CrMoN15-1). Hybrid bearings incorporate ceramic balls made from silicon nitride (Si3N4) or zirconium oxide (ZrO2), offering benefits like reduced adhesive wear and extended lifespan.
Product Specifications: The catalog details the designation system for radial ball bearings, including metric and inch dimensions, tolerance grades, radial clearance, and contact angles. It also covers various bearing types such as deep groove radial bearings, spindle ball bearings, and hybrid bearings.
Closures and Seals: The document describes different types of closures, including non-contact shields and contact seals made from materials like Teflon and Viton, designed to prevent contamination and retain lubricants.
Retainers: Various retainer designs are outlined, including two-piece and one-piece snap retainers made from materials like steel, stainless steel, and synthetic plastics, each suited for different speed ranges and applications.
Lubricants: The catalog provides information on lubricant types and quantities, emphasizing the importance of selecting appropriate lubricants for specific bearing applications to ensure optimal performance and longevity.
Technical Data: Detailed tables and charts provide information on load ratings, limiting speeds, radial play classification, and functional tests, helping users select the right bearings for their needs.
Innovations: GRW's XTRA line enhances performance through improved running noise, service lifetime, and speed capabilities, showcasing the company's commitment to continuous product development.
Accessories and Services: The catalog includes information on accessories like shims and retaining rings, as well as services such as test equipment and laboratory services, ensuring comprehensive support for customers.
Retainers: Retainers are crucial for the efficient operation of ball bearings, ensuring even load distribution and preventing ball dropout in separable bearings. They can be customized for specific applications and are available in various materials, including the new XTRAIon for extended service life. Different retainer variants are available, each suited for specific applications and temperature ranges.
Lubricants: Lubricants are essential for minimizing wear and extending the operational life of bearings. GRW offers a range of lubricants, including grease and oil, each suited for different applications. Grease lubricants are maintenance-free, while oil lubricants are preferred for high-speed applications. Special treatments and solid lubricants are available for extreme conditions, such as ultra-high vacuum environments.
Shaft and Housing Shoulders: Proper design and assembly of shaft and housing shoulders are critical for optimal bearing performance. The dimensions must allow for accurate load transfer without tilting the rings. Specific guidelines are provided for shoulder diameters and corner radii to ensure proper fit and function.
Special Installation Configurations: Flanged bearings and bearings with extended or reinforced rings offer design advantages, such as simplified assembly and increased load capacity. These configurations are particularly effective in narrow housings and high-load applications.
Fitting Tolerances: The fit of the bearing on the shaft and in the housing significantly affects performance. Factors such as rotation conditions, loading, and temperature differences must be considered when selecting fitting tolerances. Proper fit ensures high accuracy and reliability, with specific tolerances provided for different operating conditions.
Specifications and Tolerances: The document outlines various tolerances for high-precision ball bearings, specifying measurements in inches and micrometers. Tolerances are categorized based on fit types such as slide fit, tight fit, and press fit, each suitable for different load and speed conditions.
Operating Conditions: Different operating conditions are described, including low load and medium speeds for slide fits, high loads and speeds for tight fits, and high-frequency oscillations for press fits. The document emphasizes the importance of selecting the appropriate fit based on empirical performance data.
Load Ratings and Life Calculations: The static radial load rating (C0r) is defined as the maximum allowable radial load for bearings, with specific values for hybrid and steel ball bearings. The document explains the calculation of static equivalent radial load (Pr) and basic dynamic radial load rating (Cr) according to DIN ISO standards. The fatigue load limit (Cu) and nominal life (L10) are also discussed, with formulas provided for calculating the L10 life in revolutions and hours.
Extended Modified Rating Life: The extended modified rating life (Lnm) incorporates additional factors such as reliability and operating conditions, using coefficients a1 and aISO. The document provides a table correlating reliability percentages with life coefficients.
Limiting Speeds and Thermal Considerations: Factors affecting the maximum operational speed of bearings include retainer load, noise, lubrication, and heat generation. The thermal reference speed (nθr) is defined, with conditions for its calculation outlined. The document suggests that higher speeds can be achieved with special modifications and materials.
Elastic Behavior and Deformation: Axial and radial elastic deformations are discussed, with emphasis on the effects of preload and contact angle on stiffness. The document highlights the importance of material properties, particularly in hybrid bearings with ceramic balls.
Radial and Axial Play: The relationship between radial play, axial play, contact angle, and tilting angle is explored. The document advises on selecting appropriate radial play based on application requirements and discusses the impact of tilting on bearing performance.
Calibration and Grading: Calibration of bore and outside diameters is crucial for ensuring uniform fit. The document explains the grading process for bearings, with symbols used for classification based on tolerance groups.
Overview: The document provides detailed technical specifications and guidelines for classifying and managing high-precision ball bearings, focusing on bore and outer diameter tolerances, radial play, and functional testing.
Classification Method:
  • Bore Diameter: The smallest measured diameter defines the class.
  • Outer Diameter: The largest measured diameter defines the class.
Examples of tolerance codes are provided, such as Code 21 and Code BC, with specific bore and outside diameter tolerances.
Radial Play and Influencing Factors:
  • Radial play can change due to temperature gradients, shaft and housing fits, and centrifugal forces.
  • Thermal expansion and interference fits are significant factors affecting radial play.
  • Equations and examples are provided to calculate changes in radial play due to these factors.
Functional Tests:
  • GRW conducts various tests, including noise tests (GPR), axial vibration tests (GPA), torque tests, and preloading tests, to ensure bearing quality and performance.
  • These tests are performed in a cleanroom environment to maintain high standards.
Standards and Tolerances:
  • GRW bearings conform to ISO and ABEC standards, with specific tolerances for metric and inch sizes.
  • Tolerance and runout tables for inner rings are provided, detailing various precision levels (P0 to P2, ABEC1 to ABEC9).
Key Considerations:
  • Proper selection of shaft and housing fits is crucial for low-torque bearings.
  • Cleanliness during assembly is essential to prevent torque peaks.
Overview: The document provides detailed specifications and guidelines for high-precision ball bearings, focusing on deep groove radial ball bearings and duplex bearings. It includes dimensions, load ratings, closure options, and recommendations for mounting and customization.
Specifications: The document lists various bearing dimensions in both metric and inch units, detailing the width, flange dimensions, and chamfer specifications. It also provides load ratings according to DIN ISO standards and maximum limiting speeds.
Closure Options: Bearings are available with or without closures, shields, or seals. Different configurations are possible, and the document advises consulting with Technical Application Consultants for specific design requirements.
Duplex Bearings: These are matched pairs of bearings offering benefits like accurate alignment, increased reliability, and higher load capacity. They can be configured in back-to-back, face-to-face, or tandem arrangements and are designed to provide a specified preload.
Preload and Contact Angles: For deep groove radial bearings, a preload of 5 N and a contact angle of 15° are standard, but these can be customized. Spindle bearings have standardized contact angles of 15° or 25° and preloads categorized as light, medium, or heavy.
Material and Quality: GRW spindle ball bearings are made from high-grade steel or ceramic balls, with solid retainers made from fiber-reinforced phenolic resin. They are manufactured to a quality of P4 (ABEC7) or better.
Recommendations: The document emphasizes the importance of selecting appropriate bearing fits and using calibrated shafts and housings to maintain preload and ensure optimal performance. It also notes that almost all bearing types can be enhanced with GRW XTRA for improved performance.
Open Spindle Ball Bearings
  • Standard configuration includes large balls and a solid retainer for higher capacities.
  • Features a partial shoulder on the outer ring to prevent separation.
  • Designed for oil injection lubrication or oil mist.
Spindle/Angular Contact Bearings
  • Single-row angular contact bearings with contact angles of 15° or 25°.
  • Handles both radial and axial loads in one direction, indicated by a 'V' marking.
  • Suitable for high precision and high-speed applications.
Shielded Spindle Bearings
  • Non-contact shields minimize additional torque.
  • Viton shields with stainless steel support offer temperature and contamination resistance.
  • Recommended grease lubrication for longevity and reliability.
  • Available with or without shields for different applications.
Handling Recommendations
  • Keep bearings in airtight packaging until assembly.
  • Ensure extreme cleanliness during assembly.
  • Use proper assembly tools to avoid damage.
  • Duplex bearings must be used in specified configurations.
  • Run-in period at high speed is beneficial for lubricant distribution.
Duplex Bearings Configurations
  • O arrangement (back to back) offers maximum stability and stiffness.
  • X arrangement (face to face) compensates for misalignment but offers less stability.
  • Tandem arrangement supports higher axial loads in one direction.
  • Universal bearings can be assembled in various configurations without performance loss.
Superduplex Bearings
  • Double-row deep groove or angular contact bearings with integral rings.
  • Available in O, X, and tandem configurations.
Designation System
  • Includes ball and ring material, closure type, contact angle, and quality class.
  • Various retainer designs and preload values are specified.
Technical Specifications
  • Detailed dimensions, load ratings, and speed limits provided for various bearing types.
  • Preload values categorized as light, medium, or heavy.
Overview: This document provides detailed specifications and information on various high-precision ball bearings and profiled rollers manufactured by GRW. It includes data on dimensions, load ratings, speed limits, and materials used.
Specifications: The document lists numerous bearings with their main dimensions in both millimeters and inches, load ratings according to DIN ISO standards, ball set details, limiting speeds for oil and grease lubrication, and preload categories (light, medium, heavy). Each bearing type is identified by a unique designation.
Procedures and Standards: The bearings are categorized into open and sealed types, with specific guidelines for speed limits under low load conditions. The document notes that these limits are subject to change based on application requirements and that additional types are available upon request.
Materials and Construction: Profiled rollers are described as double-row ball bearings capable of handling axial and radial loads. They are made from chrome steel or corrosion-resistant materials, with options for ceramic balls. Non-contact shields are standard, with contact seals available on request.
Recommendations: The document suggests contacting GRW sales representatives for further information and highlights the availability of bearings with FDA-approved and autoclave-compatible lubricants.
Additional Information: The document mentions that almost all bearing types can be enhanced with GRW XTRA, with more details available in subsequent pages.
Overview
RW has developed specialized gluing equipment and techniques to ensure high accuracy and strength in their products. GRW bearing units offer several benefits, including cost advantages by preventing improper assembly, ease of handling, and optimal mounting conditions in clean rooms. Additional functional elements like springs and seals can be integrated based on application requirements.
Bearing Units
GRW provides various bearing units with different specifications, including profile rollers with extended inner rings. The document lists several models with their respective dimensions and characteristics.
Thin-Section Bearings
These bearings are characterized by their thin ring cross-sections, low torque, and high rigidity. They are available in several versions, including open, with closures, and with extended inner rings. Standard versions are ABEC5, with options for higher precision like ABEC7 and ABEC9.
All Ceramic Bearings
Ideal for extreme conditions such as high temperatures, vacuums, or corrosive environments, these bearings use materials like zirconium oxide and silicon nitride. They offer excellent corrosion and temperature resistance, non-magnetic properties, and current insulation.
Special Ball Bearings
GRW offers custom bearing options, including Superduplex, Extraduplex, and Tandemduplex bearings, each designed for specific load and assembly requirements. Bearings with custom outer geometries and integrated shaft bearings are also available.
Coated Bearings
For applications where conventional lubricants are unsuitable, GRW offers bearings with special coatings like gold, silver, MoS2, or Teflon, providing dry film lubrication and protection against wear.
XTRA Enhancements
GRW's XTRA developments focus on improving performance in terms of noise reduction, service life, and speed. XTRAlube and XTRAlon are examples of innovations that enhance lubrication and material properties for demanding applications.
Accessories
GRW provides shims and spring washers for precise axial preloading and tolerance management. These components are made from corrosion-proof materials and are designed for high accuracy.
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Catalog excerpts

High-Precision Ball Bearings Product Catalog-1

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

 Open the catalog to page 1
High-Precision Ball Bearings Product Catalog-2

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, AR...

 Open the catalog to page 2
High-Precision Ball Bearings Product Catalog-3

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 installation...

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High-Precision Ball Bearings Product Catalog-4

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 processes....

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High-Precision Ball Bearings Product Catalog-5

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 steels...

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High-Precision Ball Bearings Product Catalog-6

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 for...

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High-Precision Ball Bearings Product Catalog-7

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...

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High-Precision Ball Bearings Product Catalog-8

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...

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High-Precision Ball Bearings Product Catalog-9

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 loads...

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High-Precision Ball Bearings Product Catalog-10

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 occur...

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High-Precision Ball Bearings Product Catalog-11

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 noted...

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