The ultimate bearing for inline, skate board or luge racers. Solid Si3N4 ceramic roller balls. Ceramic ABEC 7 bearings are used by the serious skater, speed boarder or luge racer.Size 688,mini bearing,8*16*5 Axle 8mm Rings Chromer steel Balls Si3N4 ceramic Cage Nylon Lubrication Speed master oil Seal/Shield Both sides sealed Color Black.Can be made as customer’s reuqest Class Ceramic ball bearing Logo Ceramic 688RS.Can be made as customer’s request

Spherical Roller Bearings(23038CAEtc) Product Name Spherical Roller Bearings Product Type 23038CAEtc. Industrial Applications Suitable for precision instruments, low noise motors, automobiles, motorcycles and general machinery, the machinery industry, the most widely used class bearings. Features Outer ring raceway spherical shape, with auto-Mind, can compensate for misalignment and shaft deflection caused by degree of error, 

"The ball roller bearings," the invention is based on a genius idea, which is new in the rolling body and a combination of new assembly methods. Not bear the load of all the traditional roll "ball" of the ball have all been removed. This means that 15% of the diameter of the ball on both sides were removed. The result is the so-called roller ball, a flat on both sides of the ball,the ball really narrow than 30%. This significantly saves valuable space.

Currently the main use of four cylindrical roller bearings and four-row tapered roller bearings, also with double row cylindrical roller bearings, double row tapered roller. Tapered roller bearings they use a hollow roller and the pillar of the cage to improve the bearing lubrication, bearing cylindrical surface and end, respectively to open a fuel tank and the hole, as with the roll neck for the clearance fit, the bearing inner circle hole surface the creation of spiral grooves.