Designation system
Group 4
4.1 4.2 4.3 4.4 4.5 4.6 15
Group 4.6: Other variants
Group 4.5: Lubrication
Group 4.4: Stabilization
Group 4.3: Bearing sets, matched bearings
Group 4.2: Accuracy, clearance, preload, quiet running
Group 4.1: Materials, heat treatment
953