The Sierra 18-3706-9 Prop Nut is interchangeable with the following: GLM 22160, Evinrude/Johnson 318971. Each Sierra product meets or exceeds the original equipment part it replaces. Thread comes in a size of 1/2 in.-13 and wrench size of 13/16 in. SAE/21mm metric.
Sierra Prop Nut
Meets or exceeds the original equipment quality
Thread: 1/2 in.-13
Wrench Size: 13/16 in. SAE/21mm
