O.S. Engines crankshaft is constructed of steel. This part rotates inside the engine and the moving parts attach to it.
Assembly into the engine
Total Length: 92.5mm (3.6")
Connecting Rod Pin Length: 6.5mm (0.26")
Connecting Rod Pin Diameter: 7mm (0.28")
Crankshaft Bearing Diameter: 17mm (0.67")
Length of Threaded Portion: 16mm (0.63")
Crankshaft Thread Size: 1/4-28