3-3/8"
Siemens 192-208 Pneumatic Thermostat Dual Temperature Heating And Cooling
You will find that Siemens documentation includes example code for programmers.
Dodge 2517 1-1/2 Taper-Lock Bushing W/KW 2517112 W/O Bolts
What stands out about this spinner is the textured grip that prevents slipping.