What are the standard dimensions for bearings?

2 Answers
ArthurRose
07/29/25 7:26pm
Inner diameter is 6, thickness is 5, but the outer diameters are 12 and 13 respectively. Below are detailed introductions to relevant content: Outer diameter dimensions: Miniature bearings (440mm). Angular contact ball bearings are commonly referred to as Class 6 bearings represented by 36 and 46 types, with contact angles typically being 15 degrees, 25 degrees, 45 degrees, etc. Sliding bearings: Sliding bearings do not have inner or outer rings nor rolling elements, and are usually made of wear-resistant materials. They are commonly used in mechanical rotating parts with low speed, light load, and where lubricating oil injection and maintenance are difficult. Spherical plain bearings: The sliding contact surface of spherical plain bearings is spherical, mainly suitable for oscillating motion, tilting motion, and rotational motion.
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MacLila
08/14/25 2:14pm
When it comes to standard bearing sizes, I find it quite complex because bearing issues often come up in car modifications. There really isn't a unified standard for bearing sizes—it all depends on the type and application. For example, in wheel bearings, the 6205 series is common, with an inner diameter of 25mm, outer diameter of 52mm, and width of 15mm. But in other places, like bearings in the transmission, they're much smaller, maybe only 10mm inner diameter. There are some international standards, like ISO classifications for series, but when actually buying bearings, you need to look at the manufacturer's model number or directly check the repair manual. I've also tried measuring them myself, using calipers to measure the inner diameter, outer diameter, and width to ensure they match the vehicle's load—for instance, larger sizes are more durable for off-road vehicles. Safety first—wrong sizes can easily cause wear or failure, so I recommend beginners start by getting familiar with mainstream types.
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