●Accuracy Grade: JIS N8 (JIS B 1702-1:1998), Old JIS Class 4 (JIS B 1702:1976) ●Tooth Shape: Double tooth ●Pressure angle: 20 degrees ●Material: S45C ●Heat Treatment:- ●Tooth Hardness: Less than 194HB ●Module: m0.8, Number of Teeth: 64, Shape: S1T, Hole Diameter (AH7): 6, Boss Diameter (B): 28. ●Reference Circle Diameter (C): 51.2 Tip Circle Diameter (D): 52.8 Tooth Width (E): 8 Total Length (G): 16