Why is the PSI measurement important on my Bostitch tool?

PSI or Pounds Per Square Inch tells us how much air pressure is in the tool. If too much pressure is used, over time severe internal damage can result from too much air pressure. If not enough air pressure is used, the fastener may not be driven completely. The air supply must be capable of sustaining the proper PSI in order for the nailer/stapler to operate satisfactorily and safely.