NK12/12+1R9X12X12 日本NTN轴承 4T-32206C,NK12/12+1R9X12X12重量,NK12/12+1R9X12X12尺寸,NK12/12+1R9X12X12参数 4T-30313D重量,4T-30313D尺寸,4T-30313D参数,