Specification Brand : Auto Crane BulletPoint1 : ❤Cylinder Linear Motion Ball Bearing Model: LM12UU, Inner Diameter (ID): 12mm / 0.47", Outer Diameter (OD): 21mm / 0.83", Total Length (L): 30mm / 1.18". BulletPoint2 : ❤Application: Linear Bearings Are An Indispensable Part Of Linear Motion Modules, Units Or Components, And Are Usually Used With Cylindrical Shafts Or Guide Rails. It Is Very Suitable For 3D Printers, CNC, Linear Slides, Electronic Equipment, Modules Or Units With Linear Motion. BulletPoint3 : ❤Good Performance: Linear Bearing Adopts Interchangeability And Standardized Design. Compared With Other Products, There Is No Need To Worry About The Trouble Caused By Replacement And Wear. It Has Low Noise, Smooth Movement, Low Friction, High Rigidity And Long Service Life. BulletPoint4 : ❤Bearing Material: Bearing Steel Is Durable, Pre-Lubricated And Easy To Maintain. Both Sides Are Equipped With Contact Seals To Prevent Contaminants From Entering. Provides Precise Low-Friction Linear Motion. 4 Rows Of Steel Balls Go Round And Round, Forming a Complete Closed Loop. Dynamic Load Rating (C): 412 N, Static Load Rating (Co): 598 N. BulletPoint5 : ❤What Will You Get?: 4 Pcs LM12UU Cylinder Linear Motion Ball Bearing. If You Have Any Questions About Your Purchase, Please Feel Free To Contact Us And We Will Do Our Best To Help You. Color : 011 bluegill ExternallyAssignedProductIdentifier : 4571473537981 ExternallyAssignedProductIdentifier1 : 643934584712 ExternallyAssignedProductIdentifier2 : 0643934584712 FitType : Universal ItemName : Auto Crane Gear, Worm, 6.667PD, 4.00 ID.75 Key, 3203, ItemPackageDimensions_Height : 8 inches ItemPackageDimensions_Length : 12 inches ItemPackageDimensions_Width : 12 inches ItemPackageQuantity : 1 ItemTypeKeyword : worm-gears Manufacturer : Auto Crane Material : Alloy Steel ModelNumber : a18071300ux0366 NumberOfItems : 1 NumberOfPieces : 1 PartNumber : 320988253 ProductDescription : Auto Crane 320988253, GEAR, WORM, 6.667PD, 4.00 ID, .75 KEY ProductExpirationType : Does Not Expire ProductSiteLaunchDate : 2021-01-21T04:37:42.666Z Size : LM12UU SpecificationMet : ISO 9001 Style : LM12UU SupplierDeclaredDgHzRegulation : not_applicable TargetSpecies : Bluegill UnitCount : 1 UnspscCode : 25170000