China Standard 440/440c Stainless Steel Ball 1/4′′ 3/8′′ G100 for Screw Rod, Auto Parts, Electronic Products

Product Description


Product Description

Chemical composition

Production Process


the reason to choose us

Company Profile

Xihu (West Lake) Dis. CHINAMFG Industry and Trade Co.Ltd was founded in 1994,have more than 20 years experience in producting carbon steel ball,chrome steelbal and stainless steel ball.

The annual production capacity is about 7,000 ton and most of them are exported to Japan,Canada,South-Africa,Chile etc more than 10 countries and areas in the world.


Our company can product and supply all kinds of steel ball.Material can be carbon steel,chrome steel and stainless steel,The diameter is 0.2mm-25.4mm,grade is G10-G1000,and the hardness is hrc58-62.

Our steel ball mainly used for automobiles, motorcycle,bicycle,precision bearing,precision machinery and wheels,trundles etc.Meanwhile, special product can be customized according to clients request.


For any inquiry,questions or request for technical support,please do not hesitate to contact us.Looking CHINAMFG to service and cooperate with you.



Packaging & Shipping



Q1: Are you a factory or a Trade Company?
A: We are factory and have Hi-Tech and capable production line. 

Q2: What's your advantage? Why we choose you?
A: we have more than 20 years balls manufacture experience, have large stock and wide size range.

Q3:Could you supply samples? Is it free or extra? 
A:Yes, We can provide free samples and you just need to payment freight costs.

Q4:Where do you export?
A: Our products are exported to over 40 countries and regions including USA, Korea, Japan, Malaysia, Australia, Canada and South Africa, and so on.

Q5:Could you tell me the delivery time of your goods?
A:5-10 days stock goods and other goods according to the quantity of about 15-20days.

Q6:What's the packaging?
A:There are Plastic boxes,Carton, Steel Drum or as Customer′s Demand.

Q7:What's your payment way?
A:We accept the TT,Payment=1000USD, 30% T/T in advance,balance payment before shippment. 

Customized: Customized
Certification: ISO
Standard Parts: Yes
Universal: Yes
Type: Bearing Ball
Material: Stainless Steel
US$ 0/Piece
1 Piece(Min.Order)




screw ball

How do screw balls contribute to the efficiency of mechanical systems?

Screw balls, also known as ball screws, play a crucial role in enhancing the efficiency of mechanical systems. They offer several advantages that contribute to improved performance, reduced energy consumption, and increased overall system efficiency. Here are some key ways in which screw balls contribute to the efficiency of mechanical systems:

  • High Efficiency of Power Transmission: Screw balls are highly efficient in converting rotary motion into linear motion. The rolling contact between the ball bearings and the screw threads minimizes friction compared to other types of linear motion systems, such as sliding or belt-driven mechanisms. This high efficiency allows mechanical systems to transmit power more effectively, resulting in reduced energy losses and improved overall efficiency.
  • Improved Positioning Accuracy and Repeatability: Screw balls provide excellent positioning accuracy and repeatability, making them ideal for applications that require precise linear motion control. The ball bearings' rolling contact with the screw threads ensures minimal backlash and hysteresis, resulting in accurate and repeatable positioning. This precision eliminates the need for additional corrective actions, reducing inefficiencies and improving the overall accuracy and efficiency of the mechanical system.
  • Reduced Friction and Wear: Screw balls are designed to minimize friction and wear between the ball bearings and the screw threads. The rolling contact reduces sliding friction, resulting in less energy loss due to frictional heating. Additionally, advancements in materials and coatings have further reduced friction and wear, extending the screw ball's lifespan and reducing the need for frequent maintenance and replacement. The reduced friction and wear contribute to improved efficiency and lower operating costs.
  • Increased Load-Carrying Capacity: Screw balls are capable of handling high loads due to their ball bearing design. The load is distributed over a large number of ball bearings, allowing for efficient load transmission and reduced stress on individual components. The ability to handle high loads without sacrificing efficiency makes screw balls suitable for applications that require heavy-duty or high-performance linear motion systems.
  • Energy-Saving Features: Manufacturers have introduced energy-saving features in screw ball designs to further enhance efficiency. For example, some screw balls incorporate low-friction ball nuts or optimized ball-to-raceway contact, reducing power requirements. Additionally, advancements in lubrication systems and materials minimize energy losses due to friction, resulting in improved energy efficiency and reduced operating costs.
  • Integration with Automation and Control Systems: Screw balls can be easily integrated with automation and control systems, allowing for precise and efficient motion control. By integrating screw balls with servo motors, drives, and feedback systems, mechanical systems can achieve accurate and synchronized movement, minimizing errors and inefficiencies. This integration enables advanced automation and control strategies, optimizing system performance and energy usage.

By leveraging the advantages of screw balls, mechanical systems can achieve higher efficiency, improved accuracy, and enhanced performance. The reduced friction, high load-carrying capacity, and energy-saving features of screw balls contribute to lower energy consumption, reduced maintenance requirements, and increased productivity. These benefits make screw balls a popular choice in various industries where efficiency and precision are essential, such as robotics, CNC machines, aerospace, and automotive manufacturing.

screw ball

What are the advantages of using a screw ball in mechanical assemblies?

Using a screw ball, also known as a ball screw, in mechanical assemblies offers several advantages over other types of linear motion systems. These advantages make screw balls a popular choice in various applications that require precise and efficient linear motion. Here are some key advantages of using a screw ball:

  • High Efficiency: Screw balls are designed for high efficiency in converting rotational motion into linear motion. The rolling contact between the ball bearings and the raceway reduces frictional losses, resulting in improved power transmission and energy efficiency compared to systems with sliding friction.
  • Precision and Accuracy: Screw balls provide high levels of precision and accuracy in linear motion. The combination of a specialized thread configuration and ball bearings minimizes axial play and backlash, resulting in precise positioning and repeatability. This makes screw balls ideal for applications that require accurate and reliable motion control.
  • Load-Carrying Capacity: Screw balls are designed to handle higher loads compared to other linear motion systems. The presence of ball bearings distributes the load evenly along the screw shaft, reducing stress concentrations and allowing for increased load-carrying capability and improved rigidity.
  • Longevity and Durability: Screw balls are constructed from materials such as steel or ceramics, chosen for their durability and strength. These materials provide excellent resistance to wear, corrosion, and fatigue, ensuring long service life and reliable performance even in demanding operating conditions.
  • Backlash Reduction: Backlash, which refers to the amount of free motion or play between the screw and the nut, is minimized in screw ball systems. This reduction in backlash enhances system responsiveness, eliminates positioning errors, and improves overall accuracy in applications that require precise control.
  • High-Speed Capability: Screw balls can operate at high speeds while maintaining accuracy and stability. The rolling contact between the ball bearings and the raceway reduces friction, enabling smooth and efficient motion even at high rotational speeds.
  • Low Maintenance: Screw balls require minimal maintenance compared to other types of linear motion systems. Proper lubrication and periodic inspections are typically sufficient to ensure optimal performance and longevity. The reduced maintenance requirements contribute to cost savings and increased uptime in industrial and automation applications.
  • Compact Design: Screw balls offer a compact and space-saving design for linear motion applications. The axial arrangement of the screw and ball nut allows for a more compact assembly, making them suitable for installations with limited space constraints.

These advantages make screw balls well-suited for a wide range of applications, including robotics, CNC machinery, semiconductor equipment, aerospace systems, and medical devices, where precise linear motion control and high efficiency are critical.

When considering the use of screw balls in mechanical assemblies, it is essential to evaluate the specific requirements of the application, including load capacity, speed, accuracy, and environmental conditions. Consulting the manufacturer's documentation, technical specifications, or seeking professional advice can help in determining the suitability of screw balls for a given mechanical assembly.

screw ball

What is a screw ball and where is it commonly used?

A screw ball, also known as a knuckleball, is a type of pitch in baseball that is characterized by its erratic and unpredictable movement. Unlike most pitches that follow a predictable trajectory, the screwball moves in an unconventional manner, often resembling a combination of a fastball and a curveball. It is thrown by applying a specific grip and using a throwing motion that imparts spin and a unique arm angle.

The screwball gets its name from the way it breaks or "screws" away from a pitcher's arm side. For a right-handed pitcher, the ball typically moves from right to left (away from right-handed hitters) and vice versa for a left-handed pitcher. This movement is opposite to that of a regular curveball, which breaks towards the pitcher's arm side.

Due to its unusual and deceptive movement, the screwball can be challenging for batters to track and hit accurately. It can break late and sharply, making it difficult to anticipate its path. The unpredictability of the screwball makes it an effective weapon for pitchers to keep hitters off balance and induce swings and misses or weak contact.

While the screwball was more commonly used in the early decades of baseball, it has become a relatively rare pitch in modern professional baseball. The pitch requires a specific throwing motion and grip that can put strain on a pitcher's arm and increase the risk of injury. As a result, many coaches and organizations discourage or outright prohibit young pitchers from learning or throwing the screwball to protect their long-term arm health.

It's worth noting that the screwball is still seen occasionally in professional baseball, typically from pitchers who have mastered the mechanics and have the necessary arm strength and flexibility to throw the pitch safely. However, its usage is far less prevalent compared to other pitches like fastballs, curveballs, sliders, or changeups.

In summary, a screwball is a pitch in baseball known for its erratic and unpredictable movement. While it was once more commonly used, it has become less prevalent due to concerns about arm health. When thrown correctly, the screwball can be a challenging pitch for batters to hit, offering a unique strategic advantage to pitchers who can effectively utilize it.

China Standard 440/440c Stainless Steel Ball 1/4′′ 3/8′′ G100 for Screw Rod, Auto Parts, Electronic Products  China Standard 440/440c Stainless Steel Ball 1/4′′ 3/8′′ G100 for Screw Rod, Auto Parts, Electronic Products
editor by CX 2023-12-07

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