Gear accuracy: JIS B 1702-1 (ISO) Grade 7 Number of teeth: 70 Shape: B1 Standard circle diameter (mm): φ56 Tooth width (mm): 8 Hole diameter (mm): 8 Module: 0.8 Tip circle diameter: φ57.6 Total length (mm):18 集线器外径(mm):φ40 尖端圆直径(mm):φ57.6 集线器长度(mm):10