Stainless steel deep groove ball bearings and its tolerances

There are several common designs of ball bearing, each offering various trade-offs. They can be made from many different materials, including: stainless steel, chrome steel, and ceramic (silicon nitride (Si₃N₄)). A hybrid ball bearing is a bearing with ceramic balls and races of metal.

SKF stainless steel deep groove ball bearings are resistant to corrosion from moisture and several other media. These single row deep groove ball bearings have the same deep raceway grooves and close conformity between raceways and balls as standard deep groove ball bearings made of carbon chromium (rolling bearing) steel. They are without filling slots and can carry axial loads acting in both directions in addition to radial loads, even at high speeds. SKF stainless steel deep groove ball bearings have the same running properties as conventional steel deep groove ball bearings, but have a lower load carrying capacity. The bearings are available in open and sealed designs for shaft diameters from 1 to 50 mm. SKF stainless steel bearings are identified by the designation prefix W, e.g. W 626-2Z.

SKF stainless steel bearings in metric sizes are produced to Normal tolerances as standard. Some sizes are also available to tolerance class P6 or P5 specifications. The tolerances conform to ISO 492:2002, classes Normal, 6 and 5. The inch-size bearings are produced with Normal tolerances for inch-size bearings as specified in BS 292:Part 2-1982 (now withdrawn).