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What is ISO 3290/DIN 5401

October 17, 2023

ISO 3290 and DIN 5401 are international and German standards, respectively, that specify the quality and classification of precision steel balls used in various industrial applications, including ball bearings and other machinery components. These standards ensure that the steel balls meet specific size, tolerance, and material requirements to guarantee consistent and reliable performance.

ISO 3290: ISO 3290 is an international standard that outlines the requirements for precision steel balls. It classifies these balls into different grades based on their diameter and sphericity (roundness). The grades are typically designated as GXX, where “XX” represents a specific diameter range. For example, G10, G16, G25, and so on. The smaller the number, the higher the precision of the steel ball.

DIN 5401: DIN 5401 is the German standard that is similar to ISO 3290 and covers precision steel balls. It also classifies steel balls into grades based on diameter and roundness, often designated with the letter “K” followed by a number. For example, K100, K200, K500, etc.

These standards are essential in industries that require precision components, as they help ensure that the steel balls used in various applications meet specific criteria for size and shape, thus contributing to the performance and longevity of the machinery.

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