S634 Bearing

Size: length*width*height 4*16*5 (mm), the size can be customized according to customer needs.

Material: stainless steel 304, stainless steel 420, stainless steel 440, stainless steel 316, the material can be customized according to customer needs.

Neutral salt spray certification for 260 hours.

Ball bearing salt spray certification test is tested in accordance with ISO 9227 standards

An early example of a ball bearing was found on an ancient Roman vessel built in 40 BC in Lake Nami, Italy: a wooden ball bearing was used to support a rotating table top. Leonardo da Vinci is said to have described a ball bearing around 1500. Among the various immature factors of ball bearings, one very important point is that the balls will collide with each other, causing additional friction. But this can be prevented by putting the balls in individual cages. In the 17th century, Galileo made the earliest description of the "cage ball" ball bearing. At the end of the seventeenth century, C. Wallow of England designed and manufactured ball bearings, and installed them on the mail coach for trial use, and P. Worth of England obtained a patent for ball bearings. The first practical rolling bearing with a cage was invented by watchmaker John Harrison in 1760 for the H3 chronograph. At the end of the eighteenth century, H.R. Hertz of Germany published a paper on the contact stress of ball bearings. On the basis of Hertz's achievements, R. Stribeck in Germany, A. Palmgren in Sweden and others conducted a large number of experiments, and made contributions to the development of design theory and fatigue life calculation of rolling bearings. Subsequently, Russia's N.P. Petrov applied Newton's law of viscosity to calculate bearing friction. The first patent for a ball raceway was obtained by Philip Vaughan of Carmarthen in 1794.

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