The contact terminals are 5/16"-24 studs

continuous-rated solenoids are preferred for applications where the coil remains energized for extended periods without overheating

As a veteran's choice for HVAC flow switch parts

making it compatible with most residential furnace control boards

originally found in Honeywell and DeZurik designs

Lochinvar & A.O. Smith 100170640 Thermostat Control 320735-701 The contact terminals are 5/16"-24As a veteran tech, you know that maintaining thermal safety is non negotiable for commercial boiler and water heater uptime. The Lochinvar & A. O. Smith 100170640 Thermostat Control is a critical high limit thermostat engineered to provide precise over temperature protection in Lochinvar boilers and high recovery water heating systems. This genuine OEM temperature limit switch serves as a direct replacement for the obsolete Lochinvar TST30009,