16 Shape: S1 Reference circle diameter (mm): φ12.8 Tooth width (mm): 4 Module: 0.8 Hole diameter A (mm): φ3 Tooth tip circle diameter: 14.4 Total length (mm): 8 Hole diameter A' (mm): φ3.1 Boss diameter (mm): 8 Tooth tip circle diameter (mm): φ14.4 Boss length (MM):4