IATF 16949 & ISO 9001 Certified Manufacturer

Precision Steel & Bearing Balls Manufacturer

About ZD Steel Ball

20+ Years of Precision Steel Ball Manufacturing Excellence

Zhangjiagang Zhengda Steel Ball Co., Ltd. is a specialized manufacturer of high-precision steel and bearing balls, certified under IATF 16949 and ISO 9001. We produce precision balls ranging from 0.2mm to 50mm with grades from G10 to G1000. Equipped with advanced cold heading machines, precision grinders, high-efficiency heat treatment facilities, and automated optical sorting systems, we deliver durable, ultra-low noise, and wear-resistant ball solutions for automotive bearings, precision valves, aerospace, and micro-mechanical applications worldwide.

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Our Core Products

High Precision, Tight Tolerance & Custom Engineered Steel Balls

Chrome Steel Balls (AISI 52100 / GCr15)

Precision Grade G10-G100. High hardness (HRC 60-66), exceptional wear resistance, and long fatigue life for automotive & industrial bearings.

Stainless Steel Balls (304 / 316 / 420 / 440C)

Superior corrosion resistance and food-grade safety. Widely used in precision pumps, valves, medical instruments, and aerospace components.

Carbon Steel & Miniature Balls (0.2mm – 50mm)

Cost-effective solutions and micro-diameter balls with high surface finish, tailored for drawer slides, casters, bicycles, and micro-motors.

Precision Engineered to Your Exact Blueprints & Tolerance Standards.

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Application Fields

Industries We Serve!

Automotive & Bearings

High-precision G10-G28 chrome steel balls for wheel hub bearings, steering systems, gearboxes, and EV motors with ultra-quiet durability.

Valves & Precision Pumps

Corrosion-resistant 304, 316, and 440C stainless steel balls designed for flow control valves, high-pressure sprayers, dispensing pumps, and metering systems.

Medical & Micro Instruments

Ultra-miniature steel balls (down to 0.2mm) with mirror finish and stringent roundness, tailored for surgical tools, dental drills, and aerospace navigation devices.

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