压力角:20° 模块:1 牙齿数量:30 孔直径(mm):φ6 牙齿概况:方向齿形:1B 牙齿宽度(mm):8 8 tip圆(mm)圆形(mm) diameter (mm): φ30 Hub length (mm): 9 Hub outer diameter (mm): φ20 Worm torsion direction and number of strands (mm): R1 Worm torsion direction and number of strands: R1 Worm torsion direction and number of strands: R1 Worm torsion direction and number of链:R1 蠕虫扭转方向和链数:R1