新国标“键与键槽”(GB1095—79)中规定了键槽对称度必须按对称度公差(GB1184—80)7到9级精度进行检查,目前由于缺少适当的测量器具,给全面贯彻国家标准带来了困难。因此,迫切需要一种新型的轴键槽对称度量仪。上海闵行工具厂经过几年的努力,终于设计试制出了一种新型的轴键槽对称度量仪。并申请了发明 The new national standard “key and keyway” (GB1095-79) provides that the keyway symmetry must be symmetrical tolerance (GB1184-80) 7 to 9-level accuracy of inspection, due to the lack of appropriate measuring instruments, to fully implement the national standard with It’s difficult. Therefore, there is an urgent need for a new type of symmetrical measuring instrument of axial keyway. After several years of hard work, Shanghai Minhang Tools Factory finally designed and manufactured a new type of symmetrical measuring instrument with shaft-key groove. And applied for the invention