Cast iron plummer blocks accommodating adapter sleeve mounted spherical roller bearings are among the most common types in use, supporting rotating shafts in everything from conveyors and fans to line shafts. Key benefits of the Split Plummer Block are:SN & SD Series supports dimensionally interchangeable with the SN5.. and SD31.. range of plummer blocks Significant reductions in the time required to change trapped bearings Savings in downtime, improved machine availability Simplified mounting procedures, no feeler gauges Improved sealing efficiency, seals remain concentric to the shaft, unlike spherical roller bearings Efficient use of Maintenance Engineering resources Improved reliability, able to accommodate thermal expansion of the shaft within the bearing envelope.