Synchron "600" Series AC timing motors are available in a round case configuration with either two-hole (Model-D) or four-hole (Model-A) mounting plates. Each model is available with a 1-way clutch so that a reset function can be implemented, or with a 2-way clutch for gear train protection from excessive loads at output speeds below 6 rpm. Output speeds from the integral gearhead can be chosen from the range of 0.8 rpm to 360 rpm to drive time-measurement instrumentation, chart recorders, and event recording applications. The compact and quiet-running motor-gearbox package is only 2.0 inches in diameter by 1.38 inches long, is permanently lubricated, and requires no maintenance during its lifetime. All motors with output speeds greater than 1 rpm can be stalled indefinitely with no resulting mechanical or electrical damage. Shaft torque, rated at 1 rpm, ranges from 8 oz-in to 40 oz-in depending upon the selected winding and the wattage rating (3, 4, 5, or 6 Watts). Excitation voltage is selectable from the catalog standards of 24, 110, 220 VAC and 50 or 60 Hz or it can be customized to the application requirement. In OEM quantities, custom shaft configurations, lead lengths and lead connector terminations are welcomed.