These Cinchseal models are specifically designed for the CEMA bolt pattern on screw conveyors and bulk handling equipment. Current CEMA standards cover 6”, 9”, 12”, 14”, 16”, 18”, 20” and 24” diameter conveyor sizes with U-trough. Standard shaft sizes are 1-1/2”, 2”, 2-7/16”, 3” and 3-7/16” diameters, with 2-bolt drilling.