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• See below for our clutch type and functions guide.
• Click here for our clutch type torque behavior chart.

Torque Control Air Shut-off Clutch uses a 6-lobe internal cam driven by the motor. The clutch spindle has a flange having 6 grooves and a ball in each groove. A tapered washer and spring holds the 6 balls into the pockets of the cam. In operation, this spring force enables the motor torque to be transmitted to the fastener. As desired torque is reached, the balls are forced out of the cam pockets toward the center shaft, moving the tapered washer axially against the clutch spring. One of the balls moves a pin that trips a shut-oft lever in the center of the shaft. When this lever moves, it allows the push rod to enter a hole in the lever, move foward and shut off the throttle valve. With no more torque, the clutch spring forces the balls into the next cam pocket with little or no reaction. Removing the tool from the workpiece resets the tool for the next cycle.

Internal Ball Camming Cushion Clutch uses a 6-lobe internal cam. For driving, the balls are held in the pockets of the cam by a tapered washer and heavy spring. When adjusted torque is reached, the balls are forced out of the pockets toward the center shaft, moving the tapered washer axially and compressing the spring. The balls then move along the lobe of the cam and are forced into the next pocket by the spring and tapered washer The cycle is repeated until the tool is stopped or removed from the workpiece. There is very little friction and very little torque build-up. The lack of excessive friction provides extremely long life for this type clutch.

Positive Clutch is the most basic type of engaging-disengaging clutch. This device has two similar blocks normally disengaged. Engagement is accomplished by the axial force on the bit or socket driver. During operation, when the axial component of the torque reaction exceeds the operator force, the blocks will disengage and impact until the tool is stopped. This clutch is recommended primarily for wood screws, self tapping screws, or prevailing torque type fasteners where impacting is desired to overcome variations in torque requirements. Successful operation depends a great deal on operator technique.

Direct Drive is as its name implies. The bit or socket driver is directly coupled to the motor gearing so that when the screw or nut seats, the motor stalls. Torque generated will depend upon motor efficiency, air pressure fluctuations, joint makeup, and operator technique.

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