SGS tested · ISO certified factory
Precision Steel Ball Manufacturer in China
High-accuracy bearing steel balls | G3 - G10 grades|
SGS & ISO certified factory
High Precision Manufacturing
30+ years of steel ball production experience
ISO 14001 & 45001
IATF 16949
SGS Tested
RoHS Compliant
30+ Years Experience
About Wuxi Mingzhu Steel Ball
We are a professional manufacturer of high precision steel balls in China, specializing in bearing steel balls and ceramic balls (Silicon Nitrade). Our factory is equipped with advanced production lines and strict quality inspection systems.
13000+
m² factory
380+
machines
8 Billion+
steel balls produced annually
Φ3.969 – Φ18.256 mm
high precision bearing steel balls
Core product range
Our Steel Ball Products
G3 -G10
High-Speed Precision Bearing Balls (CNC machine)
Designed for CNC machine tools and high-precision equipment, offering excellent wear resistance, stability, and long service life under high-speed rotation.
Precision Machine Tool Bearings
G10-G100
High-Speed Precision Bearing Balls (Industrial Grade)
High-performance bearing balls used in industrial machinery and high-speed rotating systems, ensuring smooth operation and low friction.
Industrial bearings
G10-G100
Automotive Bearing Steel Balls
Specially designed for automotive wheel hubs and transmission systems, providing high durability and fatigue resistance under heavy load conditions.
Automotive bearings
G10–G100
Low-Noise Precision Bearing Balls
Ultra-smooth surface finishing for noise-free and high-speed applications, ideal for precision instruments and quiet operation systems.
Silent Bearings / Precision Equipment
AISI 304 / 316
Stainless Steel Balls
Corrosion-resistant stainless balls for instruments, machinery, and clean operating environments.
Precision instruments
G10-G100
Micro Steel Balls
Small-diameter precision steel balls used in electronics, instruments, and miniature mechanical systems requiring extremely high precision.
Electronics / Precision Devices
Strict Quality Control System
We ensure every steel ball meets international precision standards through advanced testing equipment and strict inspection processes.
Roundness inspection
Dimensional inspection verifies precision grade and geometry.
Hardness testing
HRC 61–66 hardness range checked for bearing performance.
Optical sorting system
Automated sorting supports consistency across high-volume output.
Bearing Noise & Running Test
Steel balls are assembled into bearings for practical performance evaluation, ensuring low noise and smooth rotation.
Fatigue life testing
ABLT machine testing validates service life expectations.
Production line
Advanced Manufacturing Process
01
Raw Material Selection
02
Cold Heading
03
Heat Treatment
04
Grinding & Lapping
05
Surface Enhancement
06
Cleaning & Inspection
Factory Showcase
Factory layout
Superfinishing Workshop I
Superfinishing Workshop II
Primary Grinding Workshop
Automatic Optical Inspection Laboratory
Compliance
Certifications & Compliance
IATF 16949 Certified
International automotive quality management system ensuring consistent manufacturing excellence.
SGS Tested & REACH Compliant
Products comply with EU RoHS and REACH requirements.
National High-tech Enterprise
Recognized by the Chinese government for technological innovation and R&D capabilities.
Excellent Supplier Award
Recognized by the China Bearing Industry Association.
Industry applications
Applications of Our Steel Balls
Automotive Bearings
Precision balls for automotive bearing assemblies and transmission systems.
Industrial Machinery
Reliable rolling elements for machinery, pumps, and rotating equipment.
Aerospace Components
High-accuracy components for demanding mechanical assemblies.
Precision Instruments
Clean, consistent balls for instruments and measurement devices.
Medical Equipment
Precision stainless and bearing balls for medical device assemblies.
Need a precision steel ball supplier?
Send drawings, grade requirements, or annual purchase volume for a fast quotation.