What is a non-standard ball bearing? What are the fundamental differences between it and a standard bearing?
2026-05-15
Non-standard ball bearings, as the name suggests, are bearings whose external dimensions do not conform to national standards (such as the GB/T 273 series). Simply put, standard bearings have fixed, standardized dimensions for their inner diameter, outer diameter, and width, whereas non-standard bearings are custom‑made products tailored to customers’ specific drawings and requirements.
The fundamental difference between the two lies in their “universality” and “specialization.” Standard bearings are highly versatile, readily available on the market, and relatively inexpensive; in contrast, non‑standard ball bearings are typically used in specialized equipment and applications—such as aerospace, precision instruments, and high-speed railways—and are characterized by limited versatility and small‑batch production. They may differ slightly from standard components in dimensions—for example, having an inner diameter of 49 mm instead of the standard 50 mm—or feature customized internal designs (such as the number and arrangement of steel balls) or materials (like titanium alloys, ceramics, or stainless steel) to meet specific requirements, including corrosion resistance, high‑temperature tolerance, or anti‑magnetic properties.
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