The SENSOMAT pneumatic screwdriver is a member of the MINIMAT screwdriver series, and is equipped with a unique mechanical clutch that is ideal for use with sheet metal assembly, wood assembly, and other uses requiring self drilling pass through screws. This screwdriver is developed for applications in which the driving or thread forming torque is either near or higher than the seating torque as a result of the high drilling friction. The unit can be fitted with a mechanical clutch lock out which permits the uncomplicated use of thread forming, thread cutting, or self tapping screws. The clutch lock out prevents the over tightening of the screws. Screws are driven with full power, and then released and shuts down when it reaches a pre-set torque. This permits full assembly without damage of stripping, over-tightening or damage.