This is a toothed wheel with straight toothing (involute profile). Technical data as follows:
External Ø = 15 mm; Primitive Ø = 13 mm; Root Ø = 10.5 mm
Normal module (Mn) = 1
Teeth number (Z) = 13
Pressure angle (Alfa) = 20°
Teeth angle (Beta) = 0° (Straight)
Teeth width (b) = 15 mm
Hole Ø 6 mm with keyway 2x1 mm