BSM系列齿轮（比利时、螺旋齿轮）
材质:S45C(JIS G 4051),牙形,精度:并牙,JISN8级(旧JIS4级),压力角:20°,表面处理:染成黑色,牙面加工:切削,孔径公差:JIS H7级
BSM1020,BSM1220,BSM1520,BSM2020,BSM2520,BSM3020,BSM3520,BSM4020,BSM5020,BSM6020,BSM7020,BSM8020,BSM1025,BSM1225,BSM1525,BSM2025,BSM2525,BSM3025,BSM3525,BSM4025,BSM5025,BSM6025,BSM7025,BSM8025,BSM1030,BSM1230,BSM1530,BSM2030,BSM2530,BSM3030,BSM3530,BSM4030,BSM5030,BSM6030,BSM7030,BSM8030