Pillow Block Linear Ball Bearing (CHW13) Double, Aluminum Case, Compact Part Number: CHW13 The lightest, thinnest, shortest and smallest aluminum bearing box series for shaft diameter of 3-40 mm. There are CH series with 1 linear bearing and CHW series with 2 linear bearings, and M series with anti corrosion bearings, and Ultra series. The mounting method is also designed to be flexible. Configured Specifications   Product Type Housing Motion Linear Motion Style Standard Outer Cylinder/Housing Material Aluminum Outer Cylinder Surface Finish None For Shaft Diameter(mm) 13 Overall Length L(mm) 74 Lubrication Type Standard Type Housing Length Short Ball Recirculating Type Double Dynamic Load Rating(N) 902