1 3/4 in Steel Undersized Machine Key with Plain Finish/ END ITEM IDENTIFICATION: AIRPORT SURVEILLANCE RADAR 9 (ASR9) SPECIAL FEATURES: USED IN THE DRIVE MOTOR (P/N: 43569-6005) MACHINE KEY, UNDERSIZED, SQUARE END TYPE, 1 3/4 IN LENGTH, 1/4 IN SQUARE, -0.002 IN THICKNESS TOLERANCE, -0.030 IN LENGTH TOLERANCE, TENSILE STRENGTH 64,000 PSI, ROCKWELL HARDNESS B85, HOLDS PULLEYS AND GEARS ON TRANSMISSION SHAFTS MATERIAL: STEEL OVERALL STYLE DESIGNATOR: B15 PLAIN