Catalogue number: M4B21 Features: ●Tooth precision: Standard grade (old JIS class 4, new JIS class N8) spur gear. Applications: ●For all kinds of machines, such as printing machines, automatic packaging machines, and electrical parts manufacturing lines. Specifications: ●Module: 4 ●Number of teeth: 21 ●Reference circle diameter d (mm): 84.0 ●Tooth width b (mm): 40 ●Hole diameter (mm): φ20 ●Total length l (mm): 60 ●Shape: S1 ●Tooth tip circle diameter (mm): φ92 ●Reference circle diameter (mm): φ84 ●Boss diameter (mm): φ69 ●Tooth width (mm): 40 ●Total length (mm): 60 ●Tooth shape: Standard teeth ●Pressure angle: 20° Material/Finish: ●Carbon steel for machine construction ●Surface treatment: Black dyeing
