NK21/20R+1R17X21X20 日本NTN高精度轴承 NK21/20R+1R17X21X20尺寸

NK21/20R+1R17X21X20 日本NTN高精度轴承 NK21/20R+1R17X21X20轴承尺寸参数图

NK21/20R+1R17X21X20尺寸,NK21/20R+1R17X21X20尺寸

81120T2尺寸参数