Vex high strength shaft bearings vex 276 3521 p these vex high strength shaft bearings are a larger version of the bearing flat that is designed for the standard shafts p p vex 2 3 and 4in high strength shafts 70 6379 70 6380 and 70 6382 are actually designed about 1mm shorter than their respective 2 3 and 4 inch 8 32 standoffs this means that if you use standoffs to hold together two pieces of metal the high strength shaft can rest on the high strength bearings attached to thos