Z2 noise level for most general use. Ball Bearings FR188ZZ Flange Ball Bearing 1/4"x1/2"x3/16"Double Shielded GCr15 Bearings 5pcs Bearings 1/2 Inch Bore 10-Pack Flanged Shielded Bearings FR188ZZ 1/4 x 1/2 x [Application] - Commonly used for glider/rocker arms, wheels of the cart, lawnmowers, printers, pumps, motors, gearboxes, reducer, textile machinery, electronic equipment, and more. - Keep the bearing and its working environment clean, even small dust that cannot be seen by the eyes will have a bad effect on the bearing. The limiting speed is 40000 RPM under grease lubricating. - If the following conditions happened: the bearings have abnormal noise, the grease deteriorated, or the friction increased, it is recommended to replace the grease or lubricant. 10-Pack Flanged Shielded Bearings FR188ZZ 1/4" x 1/2" x [Durable] - Chrome Steel (GCr15) races offer high hardness and great wear resistance, thus extend bearings' service life. - The internal space in the bearing was completely filled with grease means 100% full, typically lubrication range from 20% to 40%. The most important role of lubricant is to reduce friction. - Too much grease raises the temperature inside the bearing, excess heat could decrease the effectiveness of the lubricant., 3., Notice - Adding too much, or not enough grease both lead to the bearing failing prematurely. - Before operating at full speed, a running-in period is required to allow the grease time to settle into the housing. - If the lubricant is performing that service well, there should be no need to change it or add more., 2., Typical Lubrication Amount - Bearing lubrication plays a vital role. In small or miniature bearings grease fill amounts can be as little as 10%. uxcell Ball Bearing Guide Pulley Roller Round Wheel 8x30x8.5mm Double...
