Tightening torques - Fasteners with Hexagon and Hexalobular Socket and Flat Heads

Maximum Tightening Torques (Nm)ISO 4026 / DIN 913 ISO 4027 / DIN 914 ISO 4028 / DIN 915
Screw StandardDIN 6912DIN 7894ISO 7379DIN 7991ISO 14581DIN 7991ISO 7380ISO 7380ISO 4029 / DIN 916
Material / Grade8.8A2-70 A4-708.8A2-70 A4-7012.910.98.8A2-70 A4-7010.9A2-70 A4-7045 H ***A2 A4
Thread Size
M3--10.6-110.510.50.50.2
M42121.2-2212110.5
M56442.54552.54231.5
M695859994.58452.5
M820121272515-8126105
M10402435214040-2030152010
M12654050307065-3360304522
M1411066---100-50--4522
M1618011011066200110-55--9045
M18----------14070
M20280170200120400150-75--14070
M22----------220110
M24--390235-400-200--220110

*** The mechanical characteristics and property classes according to ISO 898 Pt 5 are valid for headless screws not subjected to tensile forces.

Note: Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.