Editorial Technical Reference

Precision Bearing Assembly

This page explains how Precision Bearing Assembly is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A high-accuracy bearing system designed for precise rotational motion control in machinery.

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Precision Bearing Assembly in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Precision Bearing Assembly

Definition
The Precision Bearing Assembly is a critical component of a Rotary Table, engineered to provide smooth, low-friction rotation with minimal runout and high positional accuracy. It enables precise angular positioning for machining, inspection, or assembly operations. The assembly utilizes precisely engineered rolling elements (balls or rollers) between inner and outer races to convert sliding friction into rolling friction, minimizing torque requirements while maintaining radial and axial rigidity for accurate rotational positioning.

This product is available in standard metric series with bore diameters from 10 to 200 mm, outside diameters from 30 to 350 mm, and widths from 9 to 70 mm, conforming to ISO 15. Dynamic load ratings range from 5 to 150 kN, and static load ratings from 10 to 200 kN, per ISO 76. Limiting speed varies from 3000 to 15000 rpm (ISO 15312). Radial runout is ≤0.005 mm and axial runout ≤0.008 mm, per ISO 492. Vibration levels are classified as V1 to V4 (ISO 15242). Operating temperature range is -40 to 120°C, with extended range possible using special lubricants. Material grades range from G10 to G100 (ISO 683-17), and weight varies from 0.1 to 10 kg depending on size and material.

Materials on file include high-carbon chromium steel, ceramic (for hybrid bearings), and stainless steel (for corrosion resistance). Custom sizes are available upon request. All listed parameters are reference ranges; actual values must be confirmed with the legal manufacturer or supplier for the specific model and application. Standards cited are procurement references and do not imply certification or compliance of any particular product.
Working Principle
The Precision Bearing Assembly operates by using precisely engineered rolling elements, such as balls or rollers, positioned between inner and outer races. This design converts sliding friction into rolling friction, significantly reducing torque requirements. The rolling elements are held in a cage to maintain uniform spacing and prevent contact, ensuring smooth rotation. The races are ground to high precision to achieve minimal runout and high rigidity, both radially and axially. This rigidity is essential for maintaining accurate rotational positioning under varying loads. The bearing's performance depends on proper lubrication, which reduces friction and heat generation. The assembly's design allows for precise angular positioning, making it suitable for applications requiring high accuracy, such as rotary tables in machining centers.
Common Materials
High-carbon chromium steel, Ceramic (for hybrid bearings), Stainless steel (for corrosion resistance)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Bore Diameter10–200 mmStandard metric series; custom sizes available.ISO 15
Outside Diameter30–350 mmMatches bore size for standard series.ISO 15
Width9–70 mmVaries with bearing series and load rating.ISO 15
Dynamic Load Rating5–150 kNHigher values indicate greater load capacity.ISO 76
Static Load Rating10–200 kNMaximum load without permanent deformation.ISO 76
Limiting Speed3000–15000 rpmDepends on lubrication and load.ISO 15312
Radial Runout≤0.005 mmCritical for precision applications.ISO 492
Axial Runout≤0.008 mmAffects axial positioning accuracy.ISO 492
Vibration LevelV1–V4Lower codes indicate lower vibration.ISO 15242
Temperature Range-40–120 °CExtended range with special lubricants.ISO 492
Material GradeG10–G100Higher grade means finer grain and better fatigue life.ISO 683-17
Weight0.1–10 kgDepends on size and material.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Inner Race Part
    Rotates with the shaft and provides rolling surface for bearing elements
    Material: High-carbon chromium steel
  • Outer Race Part
    Stationary mounting surface that houses the bearing assembly
    Material: High-carbon chromium steel
  • Rolling Elements Part
    Balls or rollers that facilitate smooth rotation between races
    Material: Ceramic or steel
  • Cage/Retainer Part
    Maintains proper spacing between rolling elements
    Material: Brass, steel, or polymer
  • Seals/Shields Part
    Protect bearing from contamination and retain lubrication
    Material: Rubber or metal

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Rotary Table
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Rotation Mechanism
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Rotary Orientation Platform
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Medical Device Components
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 100 MPa static, 50 MPa dynamic
temperature: -40°C to +120°C
load capacity: Radial: 15 kN, Axial: 8 kN
rotational speed: Up to 20,000 RPM
Media Compatibility
✓ Lubricating oils (ISO VG 32-68) ✓ Clean dry air/gas environments ✓ Water-glycol hydraulic fluids
Unsuitable: Abrasive slurry or particulate-laden media
Sizing Data Required
  • Shaft diameter and tolerance (mm)
  • Required radial/axial load capacity (N)
  • Operating speed range (RPM)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Fatigue spalling
Cause: Cyclic loading exceeding material endurance limit due to improper preload, misalignment, or shock loads, leading to subsurface crack initiation and surface pitting.
Fretting corrosion
Cause: Micro-motion between bearing components and housing/shaft interfaces under vibration or inadequate fit, causing oxidative wear and debris generation.
Maintenance Indicators
  • High-frequency whining or grinding noise during operation indicating lubrication breakdown or contamination
  • Abnormal temperature rise (>70°C above ambient) detected via thermal imaging or surface probes
Engineering Tips
  • Implement precision alignment procedures using laser alignment tools to maintain angular/parallel misalignment below 0.0005 inches per inch of shaft separation
  • Establish condition-based lubrication with filtered oil systems maintaining ISO 4406 cleanliness code 15/13/10 or better, using viscosity-matched greases with anti-wear additives

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 492:2014 - Rolling bearings - Radial bearings - Tolerances ANSI/ABMA 20:1996 - Radial Bearings of Ball, Cylindrical Roller and Spherical Roller Types - Metric Design DIN 620-1:2017 - Rolling bearings - Tolerances - Part 1: Tolerances for radial bearings

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: ±0.005 mm
  • Radial runout: 0.003 mm
Quality Inspection
  • Vibration analysis for noise and smoothness
  • Coordinate Measuring Machine (CMM) dimensional verification

Manufacturers of Precision Bearing Assembly

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What are the standard size ranges for this bearing assembly?

The standard metric series includes bore diameters from 10 to 200 mm, outside diameters from 30 to 350 mm, and widths from 9 to 70 mm, conforming to ISO 15. Custom sizes are available upon request.

What materials are available for this bearing assembly?

Materials on file include high-carbon chromium steel, ceramic (for hybrid bearings), and stainless steel for corrosion resistance. The choice depends on application requirements such as load, speed, and environment.

What is the maximum radial runout for this bearing?

Radial runout is specified as ≤0.005 mm, per ISO 492. This ensures high precision for applications requiring minimal eccentricity.

How should I verify the suitability of this bearing for my application?

You must confirm model-specific values such as load ratings, speed limits, and runout tolerances with the legal manufacturer or supplier. Standards cited are references for procurement and verification, not guarantees of compliance.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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