Martin S612 Spur Gear, 14.5&deg; Pressure Angle, High Carbon Steel, Inch, 6 Pitch, 1" Bore, 2.333" OD, 1.500" Face Width, 12 Teeth 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 pitch of 6 for applications where transferring torque is more important than controlling changes in speed and direction of rotation with precision High carbon steel for tensile strength and hardness