-
- HB 2402-1977 HB 242-70螺纹通瑞环规及其校对塞规应用尺寸
- HB 2402-1977
-
- HB 2397-1977 HB 242-70螺纹校对塞规 校通-通TT d=105～150mm
- HB 2397-1977
-
- HB 2396-1977 HB 242-70螺纹校对塞规 校通-通TT d=52～100mm
- HB 2396-1977
-
- HB 2395-1977 HB 242-70螺纹校对塞规 校通-通TT d=6～48mm
- HB 2395-1977
-
- HB 2394-1977 HB 242-70螺纹校对塞规 校通-通TT d=1～5mm
- HB 2394-1977
-
- HB 1894-1973 1:20锥体校对塞规和标准塞规(螺栓套规用)
- HB 1894-1973