The Bostitch 9R198761 Driver Piston Assembly is a vital part of Bostitch pneumatic nailers and staplers. This is a precision designed assembly that takes compressed air energy and converts it to mechanical force that drives fasteners into materials. When the tool is supplied with compressed air it enters into the cylinder and pushes the piston forward. The fastener driving mechanism is a forward motion and drives the nail forward or the staple into the target material. A cycle occurs when the air pressure behind the piston over exceeds that in front of it and makes the piston back. The power needed for the operation of the tool is generated by this continuous cycle of forward and backward motion.
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