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  • Stainless Steel Ball
  • Stainless Steel Ball
  • Stainless Steel Ball
  • Stainless Steel Ball
  • Stainless Steel Ball
  • Stainless Steel Ball
  • Stainless Steel Ball
  • Stainless Steel Ball
  • Stainless Steel Ball
  • Stainless Steel Ball
Stainless Steel Ball
As an ISO 9001:2015 certified factory specializing in high-precision, corrosion-resistant stainless steel balls, we understand that sourcing is more than just buying a product—it's about finding a partner who guarantees quality, controls costs, and ensures reliability. That's our commitment to you！
By sourcing directly from our factory, you save at least 15% on costs, allowing you to improve your margins significantly.
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PRODUCT PARAMETERS

As an ISO 9001:2015 certified factory specializing in high-precision, corrosion-resistant stainless steel balls.

We supply a full range of grades and specifications to meet various requirements for corrosion resistance, wear resistance, strength, and hardness in different working conditions.

Grades & Performance Comparison

GradeCorrosion ResistanceHardness (HRC)Core Use
201★★☆☆☆25-39Economical
304★★★★☆25-39General & Food-Grade
316★★★★★25-39Marine & Chemical
420★★★☆☆50-55Hardenable & Wear-Resistant
440★★★★☆58-60Highest Hardness & Wear
compliant standards:ISO 3290 / ABMA: Grade 40, 100, 200, 500, 1000；DIN 5401-78: Class III, IV, V, VI；DIN 5401 (Modern): Grade 40, 100, 200, 500, 1000。available in various precision grades to meet customer requirements
Offer comprehensive customization services. We can tailor solutions based on specific needs for materials, non-standard sizes, precision grades, or hardness levels.


AISI 201
Technical AdvantageA lean austenitic steel providing a cost-effective solution by substituting manganese (Mn) for a portion of the nickel (Ni). Offers good formability and mechanical strength similar to 304 in an annealed state.
Selection ConsiderationsChoose for: High-volume, cost-sensitive applications where corrosion exposure is minimal and non-critical (e.g., indoor decorative parts, low-stress components). Avoid for: Any application involving food contact, outdoor exposure, or corrosive chemicals.
Q&A"Is the cost saving worth the risk of corrosion?" Answer: For the right application, absolutely. We provide clear guidance on its limitations. We recommend it only when we are confident it will perform, ensuring you don't overpay for unnecessary nickel content. We guarantee transparency on material composition.
Quality AssuranceMaterial composition is verified using X-ray fluorescence (XRF) analyzers. Full traceability and Mill Test Certificates (MTC) are provided with every shipment upon request.


AISI 304
Technical AdvantageThe industry benchmark for austenitic stainless steel (18-8). Offers an excellent balance of corrosion resistance, weldability, formability, and hygienic properties. It is non-magnetic in the annealed condition but can become slightly magnetic after cold working.
Selection ConsiderationsChoose for: The vast majority of applications, including food processing, medical devices, and general industrial use where exposure to chlorides (salts) is not a primary concern. It is the default, reliable choice. Upgrade to 316 if: The application involves saltwater, de-icing salts, or other chloride solutions.
Q&A"How do I know your 304 has the correct nickel content and isn't a lower-grade substitute?" Answer: We guarantee a nickel content of 8.0% minimum. We provide a 3.1 Material Test Certificate (MTC) with full chemical breakdown and physical properties for every batch, ensuring full compliance with ASTM A240/A480 standards.
Quality AssurancePMI (Positive Material Identification) testing available. We can provide full documentation paquetes for quality audits, including certificates of conformity and material test reports.


AISI 316
Technical AdvantageSuperior corrosion resistance, particularly against pitting and crevice corrosion in chloride environments. This is achieved by the addition of 2.0-3.0% molybdenum (Mo), which stabilizes the passive layer. Offers slightly higher strength than 304 at elevated temperatures.
Selection ConsiderationsChoose for: Marine environments, chemical and pharmaceutical processing, surgical instruments, and any application where chloride exposure is unavoidable. It is the mandatory upgrade from 304 for corrosion-critical applications.
Q&A"Material fraud is common. How can I be 100% sure this is genuine 316 and not 304?" Answer: This is a valid and critical concern. We provide an unconditional guarantee on the molybdenum content. Our 3.1 MTC will explicitly state the Mo percentage (guaranteed >2.0%), which can be verified by any third-party lab. This is our commitment to authenticity.
Quality AssuranceEvery master coil is tested for chemical composition. We can provide batch-specific chemical analysis reports. Our quality system is designed to prevent material mixing and ensure absolute traceability from raw material to finished ball.


AISI 420
Technical AdvantageA martensitic stainless steel that is engineered to be heat-treated. This allows it to achieve significantly higher hardness (typically 50-55 HRC) and wear resistance compared to the 300-series. Provides good corrosion resistance in mild environments when hardened and polished.
Selection ConsiderationsChoose for: Applications where hardness, wear resistance, and strength are the primary requirements, such as in bearings, valves, cutlery, and molds. It is a cost-effective choice for a hardenable stainless steel. Not suitable for: Chemically corrosive or marine environments.
Q&A"Is the heat treatment process consistent? Will hardness vary across the batch?" Answer: We employ a precisely controlled vacuum heat treatment process with rigorous temperature and time monitoring. We perform Rockwell hardness testing on a statistical sample from every batch to ensure uniformity and compliance with your specified HRC range.
Quality AssuranceHardness test reports are available for every production lot. We can work with you to define specific hardness ranges (e.g., 52-54 HRC) to meet your engineering needs.


AISI 440C
Technical AdvantageThe "king of hardness" among stainless steels due to its high carbon content (~1.0%). Capable of achieving the highest hardness levels (58-60 HRC, sometimes higher) after heat treatment. This translates to exceptional wear resistance, strength, and edge retention.
Selection ConsiderationsChoose for: High-end, performance-critical applications like precision ball bearings, valve seats, and professional knife blades where mechanical wear is the main failure mode. Trade-off: While its corrosion resistance is good (due to high chromium), it is secondary to its hardness and is less than 316.
Q&A"High hardness can mean high brittleness. How do you manage the heat treatment to ensure toughness?" Answer: This is the key to mastering 440C. Our multi-stage heat treatment process includes a specific tempering cycle designed to relieve internal stresses and optimize the grain structure, thereby maximizing toughness without sacrificing the target hardness. This prevents chipping and premature failure.
Quality AssuranceWe can provide detailed heat treatment process parameters and records. Microstructure analysis can be performed to ensure proper carbide distribution and grain size for demanding applications.


Specifications

  • Diameter Range: 0.5mm – 200mm

（All sizes are well-stocked and ready for immediate air shipment.）

  • Precision Grade: G10 – G1000 (ISO 3290 / AFBMA standard)

  • Surface Finish: Bright, precision polished, passivated

  • Hardness: Varies by grade and heat treatment

  • Standards: AISI / ASTM / JIS / GB

Applications

  • Machinery & Equipment: Bearings, transmission systems, linear rails

  • Valves & Pumps: Excellent sealing performance for fluid control

  • Chemical Industry: Components for corrosive media pipelines

  • Food & Medical: Mixers, medical instruments

  • Marine Engineering: Components resistant to seawater corrosion

  • Decorative & Craft: Precision-polished decorative balls

Our Advantages

  • Full Material Range: 201, 304, 316, 420, 440 available

  • Custom Manufacturing: Special sizes, precision grades, tolerances, and surface finishes available

  • Strict Quality Control: 100% inspection before delivery for dimensions, hardness, and corrosion resistance

  • International Standards: Compliant with AISI, ASTM, GB, JIS

Packaging & Delivery

  • Packaging: Rust-preventive oil → Plastic bag → Carton → Pallet

  • Shipping: By sea, air, or express (as per customer requirements)

Selection Tip

For high-salt or highly corrosive environments, choose 316 or 440 grade; for high wear resistance and hardness, choose 420 or 440 grade.


FAQ

Q1: What stainless steel grades do you supply?

A: We offer stainless steel balls in grades 201, 304, 316, 420, and 440, covering a wide range of corrosion resistance, hardness, and application requirements.

Q2: What size range is available?

A: Standard diameters range from 0.5mm to 200mm, with precision grades from G10 to G1000 (ISO 3290 / AFBMA standard). Custom sizes are available upon request.

Q3: Can you provide material certificates?

A: Yes. All products are supplied with complete Mill Test Certificates (MTC). Third-party inspection reports can be arranged upon request to ensure compliance with relevant standards.

Q4: What is your minimum order quantity (MOQ)?

A: We have no strict MOQ requirements. We welcome both bulk and small-quantity orders to support various procurement needs.

Q5: How long is the delivery time?

A: In-stock items can be shipped within 3–5 days. Custom sizes or special grades usually require 7–15 days depending on production complexity.

Q6: Do you offer samples?

A: Yes, free samples are available for certain products. Customers are responsible for the sample shipping costs according to our company policy.

Q7: What applications are your stainless steel balls suitable for?

A: Our stainless steel balls are widely used in bearings, valves, pumps, food processing equipment, chemical equipment, marine applications, decorative items, and precision instruments.

Q8: How do you package the products for export?

A: Stainless steel balls are first treated with anti-rust oil, then packed in plastic bags and cartons, and finally secured on pallets or in wooden cases to ensure safe delivery.

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