Martin S1615BS 1/2 Spur Gear, 14.5° Pressure Angle, High Carbon Steel, Inch, 16 Pitch, 1/2 in. Bore,

-Transmits torque between parallel shafts to provide rotational power to another part of a motorized system-Pressure angle of 14.5 degrees for a higher contact ratio between gears, resulting in quieter operation than larger pressure angles-Diametral