If you need stainless ball you can inquiry like this

"Hello. we need the need 8mm stainless ball. do you have it?"

we receive an inquiry from a canada customer in the last month.

--we are a bearings maufacture and sales company. do you need the 8mm stainless ball for bearings use. 8±0.00125mm is ok for you? what's the quantity you need?

Why I said the size is ±0.00125mm? -it's the tolerance for stainless balls

1、 General range of outer circle tolerance for stainless balls
According to industry standards and professional information, the outer circle tolerance of steel balls is generally 0.025mm to 0.05mm. This is a relatively small range, reflecting the high-precision requirements of steel ball manufacturing. In practical applications, the specific tolerance values may vary due to factors such as the purpose, size, and manufacturing process of the steel ball.

2、 Application of G20 Tolerance Standards
The G20 tolerance standard is widely adopted in the manufacturing and application of stainless ball. This standard specifies the diameter tolerance and outer circle tolerance of stainless ball, with an outer circle tolerance of 0.05mm. This standard applies to the manufacturing of large and medium-sized transmission components and precision instruments, ensuring the high performance and long lifespan of stainless ball in these applications.

3、 The significance of the outer circle tolerance of stainless ball
The outer circle tolerance of stainless ball is one of the key factors affecting their quality and performance. Excessive tolerance can cause the steel ball to loosen or shake during fitting, increasing wear and noise; If the tolerance is too small, it may lead to a tight fit, increase friction and heat, and even cause jamming or damage. Therefore, it is crucial to control the outer circle tolerance of the stainless ball reasonably to ensure its normal operation and extend its service life.

4、 Factors affecting the outer circle tolerance of stainless ball
The outer circle tolerance of stainless ball is influenced by various factors, including the quality of raw materials, the accuracy of manufacturing processes, the control of heat treatment processes, and the rigor of subsequent processing and inspection. In order to obtain high-quality steel balls, manufacturers need to strictly control these factors throughout the entire production process, ensuring that every step meets relevant standards and requirements.