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Precision Steel Balls

High Precision Chrome, Stainless & Carbon Steel Balls – ISO 9001 & IATF16949 Certified Manufacturer Since 1992

Compliant with AISI, ASTM, DIN, JIS, NF, BS Standards

Exported to USA, Germany, Italy, Korea, Latin America

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About MINGZHU

Haimen City Mingzhu Steel Ball Co., Ltd. is a professional manufacturer of precision steel balls in China. Founded in 1992 and located in Haimen City, our facility enjoys convenient transportation—just a two-hour drive from Shanghai.

With decades of experience, we are committed to delivering high-quality steel balls and exceptional service to meet the evolving needs of our global customers. Our products are exported to markets across the USA, Korea, Italy, Germany, and Latin America.

We strictly comply with international standards including ISO 9001 and IATF16949, ensuring consistent quality and reliability in every batch.

Steel Ball Manufacturing Stainless Steel Balls Precision Components Carbon Steel Balls

Our Mission & Vision

We aim to assist in reducing costs for our customers by working closely with them—from design and manufacturing to quality inspection, logistics, and after-sale service. Our mission is to gain the satisfaction of all customers through continuous improvement of our products and services.

Our Products

Chrome Steel Balls

Chrome Steel Balls

High precision chrome steel balls used in bearings and industrial applications. Known for superior hardness, wear resistance, and dimensional accuracy.

  • • Standards: AISI, ASTM, DIN
  • • Precision Grades: G3 to G20
  • • Applications: Bearings, Automotive, Machinery
420 Stainless Steel Balls

420 Stainless Steel Balls

High-quality precision balls with excellent corrosion resistance and moderate hardness. Ideal for food processing and medical equipment.

  • • Material: AISI 420
  • • Magnetic: Yes
  • • Precision: G5 to G16
420C Stainless Steel Balls

420C Stainless Steel Balls

Enhanced version of 420 with higher carbon content for improved hardness and wear resistance. Suitable for high-stress environments.

  • • Higher Carbon for Hardness
  • • Precision: G5 to G16
  • • Applications: Valves, Pumps, Tools
316 Stainless Steel Balls

316 Stainless Steel Balls

Superior corrosion resistance due to molybdenum content. Ideal for marine, chemical, and pharmaceutical industries.

  • • Non-magnetic
  • • Excellent Saltwater Resistance
  • • Precision: G5 to G16
302 Stainless Steel Balls

302 Stainless Steel Balls

A variation of 304 stainless steel with higher tensile strength. Offers good formability and corrosion resistance.

  • • High Tensile Strength
  • • Magnetic After Cold Work
  • • Applications: Aerospace, Fasteners
304 Stainless Steel Balls

304 Stainless Steel Balls

Most widely used stainless steel. Resistant to corrosion, heat, and staining. Non-magnetic in annealed condition.

  • • General Purpose Use
  • • Non-magnetic (annealed)
  • • Precision: G5 to G16
Carbon Steel Balls

Carbon Steel Balls

High carbon content provides excellent hardness and wear resistance. Used in bearings, valves, and industrial machinery.

  • • High Hardness
  • • Cost-Effective Solution
  • • Standards: ASTM A295
Pinball Balls

Pinball Balls

Precision-engineered steel balls for gaming and amusement machines. Consistent weight and surface finish.

  • • Diameter: 0.75" to 1"
  • • Polished Finish
  • • Used in Arcade Machines
Unhardened Stainless Steel Balls

Unhardened Stainless Balls

Used in applications requiring formability and corrosion resistance without high hardness. Ideal for welding and forming.

  • • Soft, Formable Material
  • • Corrosion Resistant
  • • Common Grades: 304, 316
Bearing Steel Balls

Bearing Steel Balls

Manufactured to strict tolerances for use in ball bearings. High load capacity and long service life.

  • • Material: 52100, SUJ2
  • • Precision: G3 to G10
  • • Heat Treated for Durability
440 Stainless Steel Balls

440 Stainless Steel Balls

High carbon martensitic stainless steel with excellent wear and corrosion resistance. Used in high-performance applications.

  • • High Hardness (up to 60 HRC)
  • • Precision Grades Available
  • • Ideal for Cutting Tools
Precision Grade Steel Balls

Precision Grade Balls

Ultra-precise steel balls meeting G3 to G5 standards. Used in aerospace, medical devices, and optical instruments.

  • • Tolerance: ±0.5 µm
  • • Surface Finish: Ra < 0.025 µm
  • • Cleanroom Packaging

Why Choose MINGZHU?

Certified Quality

We operate under ISO 9001 and IATF16949 quality management systems, ensuring every product meets international standards.

Global Reach

Trusted by clients in the USA, Germany, Italy, Korea, and Latin America. Reliable logistics and after-sale support.

30+ Years Experience

Founded in 1992, we bring decades of expertise in precision steel ball manufacturing and continuous innovation.

1992
Founded
30+
Years Experience
50+
Global Markets
ISO
9001 & IATF16949

Latest News

2024/07/11

Innovation of Low-Noise, High-Precision Steel Balls

Advancements in manufacturing are enabling quieter, more efficient industrial systems.

2024/09/12

Unhardened Stainless Steel Balls: Growth Prospects

Rising demand in industrial sectors for durable, corrosion-resistant components.

2024/10/11

The Future of Precision

Unhardened stainless steel balls are key to next-gen precision engineering.

2024/11/13

High-Quality Chrome Steel Balls

Essential components in modern industry due to superior quality and reliability.

Get in Touch

For inquiries about our products or price list, please visit our official website.

Visit Official Website

+8613912237934

[email protected]

+8613912237934

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