Specification BatteriesRequired : 1 Brand : Fevas BulletPoint1 : The plastic linear bearing is a linear motion system with self-lubricating characteristics. The biggest difference between it and the metal linear bearing is that the metal linear bearing is rolling friction and the bearing is in point contact with the cylindrical shaft, so it is suitable for low load and high speed motion. The plastic linear bearing is sliding friction BulletPoint2 : Linear bearing is used in conjunction with the quenched linear transmission shaft. A system that moves in an infinite straight line. Because the load ball is in point contact with the quenching transmission shaft, the allowable load is small, but when moving in a straight line, the friction resistance is the smallest, the precision is high and the movement is fast. BulletPoint3 : Maintenance of plastic linear bearing: Because the sliding film inside the plastic linear bearing is made of self-lubricating plastic, it does not need extra oil supply and maintenance during use; Moreover, because the plastic linear bearing is provided with a chip removal groove, even if the bearing or shaft is full of dust, it does not need to be maintained BulletPoint4 : Friction resistance is small and stable. The design of linear bearing makes it have less friction resistance during operation, which helps to improve mechanical efficiency and reduce energy consumption. BulletPoint5 : Linear bearing is more and more widely used in electronic equipment, food machinery, packaging machinery, medical machinery, printing machinery, textile machinery, machinery, instruments, robots, tool machinery, CNC machine tools, automobiles and digital three-dimensional coordinate measuring equipment and other precision equipment or special machinery industries. ExternallyAssignedProductIdentifier : 7060021827997 ExternallyAssignedProductIdentifier1 : 0721498143894 ExternallyAssignedProductIdentifier2 : 721498143894 IncludedComponents : bearing ItemName : Fevas 4 pcs LM12UU 12x22x32mm Double Side Rubber Seal Linear Motion Ball Bearing ItemPackageDimensions_Height : 5 centimeters ItemPackageDimensions_Length : 5 centimeters ItemPackageDimensions_Width : 5 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : linear-ball-bearings Manufacturer : Fevas Material : Steel ModelName : Shanryah6zeM ModelNumber : LMEK30UU 30x47x68 NumberOfItems : 1 PartNumber : FVS-F2A17AE9157968F1E2328F522E2C3423 ProductDescription : 4 pcs LM12UU 12x22x32mm Double Side Rubber Seal Linear Motion Ball Bearing Made of Bearing Steel material, Double Side Rubber Seal Linear Motion Ball Bearing. Great for linear motion on 3D printer, cnc, and other applications. These ball bearing are fitted with two rubber dust sealed to prevent ingress of dirt, water and foreign matter. Bearings may require lubrication and break in period. Smooth moving, low friction, high rigidity and long life. Economical, easy to maintain replace. Product Name: Linear Bearing Material: Bearing Steel, Rubber Color: Silver Tone Model: LM12UU Outside Diameter: 22mm Inside Diameter: 12mm Length: 32mm Weight: 142g Package Contents: 4 pcs x Linear Bearing Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.