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 Standard DIN 6912 DIN 7894 ISO 7379 DIN 7991 ISO 14581 DIN 7991 ISO 7380 ISO 7380 ISO 4029 / DIN 916
Material / Grade 8.8 A2-70 A4-70 8.8 A2-70 A4-70 12.9 10.9 8.8 A2-70 A4-70 10.9 A2-70 A4-70 45 H *** A2 A4
Thread Size
M3 - - 1 0.6 - 1 1 0.5 1 0.5 0.5 0.2
M4 2 1 2 1.2 - 2 2 1 2 1 1 0.5
M5 6 4 4 2.5 4 5 5 2.5 4 2 3 1.5
M6 9 5 8 5 9 9 9 4.5 8 4 5 2.5
M8 20 12 12 7 25 15 - 8 12 6 10 5
M10 40 24 35 21 40 40 - 20 30 15 20 10
M12 65 40 50 30 70 65 - 33 60 30 45 22
M14 110 66 - - - 100 - 50 - - 45 22
M16 180 110 110 66 200 110 - 55 - - 90 45
M18 - - - - - - - - - - 140 70
M20 280 170 200 120 400 150 - 75 - - 140 70
M22 - - - - - - - - - - 220 110
M24 - - 390 235 - 400 - 200 - - 220 110

*** 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.