Bolt holes are 5 7/8 on center measured across the shaft. Wiring diagram on motor name plate. Century Equivalent UST1152, replaces EUST1152. Effective July 19, 2021 the US Dept of Energy regulations on single speed, two-speed and booster pumps go into effect. Please check your local and State codes to comply with their requirements for replacement pump motors.California: This replacement pump motor does not comply with California's Efficiency Regulations. To meet California's requirement, the replacement pump motor must be a variable speed. Please know your State, Local Laws and Building Codes for replacement pump motors to comply with their regulations.