This is the O.S. Max Crankshaft for the FS-120 Surpass III and FS120-SE. / This crankshaft is supported by bearings and attaches to the connecting rod / to move the piston up and down within the cylinder head. / / FEATURES: Constructed of hardened steel for long life / / INCLUDES: One O.S. Max Crankshaft for the FS-120 Surpass III and FS120-SE / / REQUIRES: Disassembling engine to install Crankshaft / / SPECS: Length of threaded portion: 0.98" (25mm) / Rod Pin Length: 0.31" (8mm) / Rod Pin Diameter: 0.31" (8mm) / Thread Size: 5/16-24