Rear Outer Axle Lock Nut OEM 240Z 280Z 280ZX 510New OEM genuine Nissan rear outer axle lock nut. This nut will fit Datsun 240Z, 260Z, 280Z, 280ZX and 510 1970 83. This nut will most likely need to be replaced if you are servicing the rear wheel bearings. This is the later style self locking nut with flange. The factory service manual recommended torque spec is 180 240 lb ft. It is difficult to achieve this torque spec so we also recommend the use of red threadlock on the nut., PT# 800 917.