抄録
The product name of the bolts newly developed is PILLAR NS REAMER BOLTS. They represent resins coated reamer bolts and nuts used as the torque-transmission coupling bolts for ships' propulsion shafting systems.
The bolts are featured by the ease of their pressure fitting and extraction, also their freedom from seizure though they are provided with 0.01 to 0.05 mm of interference against reamer holes.
The PILLAR NS REAMER BOLTS can ensure electrical discontinuity between the matching shafts by inserting an insulating sheet in a space between the flange surface and contact face of bolt head. The intermediate shafts of a ship electrically insulated by this method can effectively prevent spark erosion which is otherwise generated between the crankshaft journal and main bearing of the main engine due to potential induced between ship's propulsion shafting and hull.
