Shaft Speed - Considering the speed that the shaft will be moving, the runout, the housing bore and the type of oil being sealed is vital to making sure you select an oil seal that will not suffer from abrasions or spiralling.
The Role of TC Oil Seal in Modern MachineryMost ERIKS oil seals, such as the types M, MST, R and RST, are made of NBR as standard.
The Vital Role of Chainsaw Spark Plugs Understanding and Maintenance