2015JB/T 7293.7-2015 Bolts and nuts for internal combustion engines - Part 7: Specifications for cylinder head nuts and flywheel nuts
1999JB/T 9765.3-1999 Internal combustion engines.Cylinder head and flywheel nuts.Specifications
1978NJ 67-1978 Specifications for cylinder head nuts and flywheel nuts
0000 NJ 67-1966
NJ 67-1978 Specifications for cylinder head nuts and flywheel nuts was changed to JB/T 9765.3-1999 Internal combustion engines.Cylinder head and flywheel nuts.Specifications.