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440 Stainless Steel Ball

  • Q Do you have ISO9001, RoHS, or other quality certifications for your steel balls?

    A
    ISO 9001:2015 Certified: Our entire manufacturing facility operates under a strict Quality Management System to ensure consistency in every batch.
     
    Environmental Compliance: All our stainless steel balls (including 440C, 304, 316) are RoHS and REACH compliant, ensuring they are free from hazardous substances and safe for international export, especially to EU and US markets.
     
    Material Traceability: We can provide Material Test Reports (MTR) and inspection certificates (covering hardness, precision grade, and chemical composition) upon request with your shipment.
     
    IATF 16949 Standards: For automotive applications, we adhere to high-level precision standards to meet the most demanding industrial requirements.

  • Q Can you provide OEM/ODM services for custom sizes and specifications?

    A
    Yes, absolutely. Backed by our heritage from the Wujin Metal Ball Research Institute, we offer comprehensive OEM/ODM services.
     
    Custom Dimensions: We can manufacture non-standard diameters and fractional sizes beyond our catalog.
     
    Specialty Materials: We offer custom processing for specific alloys, including military-grade steel, ceramic, and copper balls.
     
    Surface Treatment & Hardness: We can adjust heat treatment processes to achieve specific HRC hardness levels or provide special surface finishes (mirror polishing, passivating, etc.) based on your technical drawings.
     
    Private Labeling: We provide customized packaging and labeling with your brand and batch tracking information for seamless integration into your supply chain.

  • Q What is the Minimum Order Quantity (MOQ) for 440C stainless steel balls?

    A
    Our MOQ is flexible depending on our current inventory and your specific requirements:
     
    In-Stock Sizes: For standard sizes (e.g., 0.8mm to 25.4mm) that we have in stock, we can support small trial orders starting from 1,000 pieces or even 1kg for testing purposes.
     
    Custom Production: For non-standard sizes or specific precision grades (like G10), the MOQ typically starts from 5,000 to 10,000 pieces, depending on the material volume and manufacturing complexity.

  • Q What sizes and grades are available for 440 balls?

    A
    Sizes: From miniature (1/32 inch or 0.8 mm) to large (up to 4.5 inches or 114 mm diameter).
    Grades: Precision (Grade 10-100 for tight tolerances) to commercial/media (Grade 200+ for grinding).
    Custom options include polished finishes and certifications like QQ-S-763B or ASTM A756.

  • Q What are the common applications of 440 stainless steel balls?

    A
    •  Bearings: Antifriction and rolling-contact bearings, actuators, and pumps.
    • Valves and Fasteners: Check valves, locking mechanisms, and quick-release components.
    • Industrial Tools: Grinding media, surgical/dental instruments, cutlery, and high-wear parts like ball bearings in machinery.
    • Other: Food processing equipment, agitators in paint bottles, and low-load adhesive-bonded assemblies. 

  • Q What is 440 stainless steel, and what makes 440C balls special?

    A  440 stainless steel refers to a family of martensitic grades (440A, 440B, 440C) with varying carbon content for different balances of hardness and corrosion resistance. 440C balls are the hardest variant, containing about 1% carbon, making them one of the toughest stainless steels available. They offer superior edge retention, dimensional stability, and resistance to abrasion compared to softer grades like 316 or chrome steel. These balls are uniformly hardened and tempered throughout for maximum strength.  

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