What's the difference between 6208 and 6308 and 6408 bearings?

First of all, the thickness is different:

1 and 6208 have an outer diameter of 80mm and a thickness of 18mm.

2.6308 The outer diameter is 90 mm and the thickness is 23 mm..

3.6408 has an outer diameter of110mm and a thickness of 27mm. ..

2. Bearing is an important part of modern mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement and ensure its rotation accuracy.

Three, according to the different friction performance of moving elements, bearings can be divided into rolling bearings and sliding bearings. Among them, rolling bearing has been standardized and serialized, but compared with sliding bearing, its radial size, vibration and noise are larger and its price is higher.

4. Rolling bearings generally consist of four parts: outer ring, inner ring, roller and cage. According to the shape of rolling elements, rolling bearings are divided into two categories: ball bearings and roller bearings.

Extended data:

Sliding bearings have no inner and outer rings and no rolling elements, and are generally made of wear-resistant materials. It is often used in mechanical rotating parts with low speed, light load, lubricating oil filling and difficult maintenance.

The sliding contact surface of joint bearing is spherical, which is mainly suitable for swinging motion, tilting motion and rotating motion.

Rolling bearings are divided into radial bearings and thrust bearings according to the load direction or nominal contact angle they can bear. The radial contact bearing is a radial bearing with a nominal contact angle of 0, and the radial contact bearing is a radial bearing with a nominal contact angle greater than 0 to 45.

The axial contact bearing is a thrust bearing with a nominal contact angle of 90, and the thrust angle contact bearing is a thrust bearing with a nominal contact angle greater than 45 but less than 90.

According to the shape of the rolling body, it can be divided into ball bearing and roller bearing. Roller bearings are divided into cylindrical roller bearings, needle roller bearings, tapered roller bearings and self-aligning roller bearings.

According to whether it can be self-aligning during work, it can be divided into self-aligning bearings-spherical raceway bearings and non-self-aligning bearings (rigid bearings) that can adapt to the angular deviation and angular movement between two raceway axes-bearings that can resist the angular deviation between raceway axes.

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