0A-28 GENERAL INFORMATION
Tightening torque chart:
Thread Diameter (Nominal Diameter) (mm)
4 5 6 8 10 12 14 16 18
Strength
A equivalent of 4T strength
fastener
N·m 1.5 3.0 5.5 13 29 45 65 105 160
kg-m 0.15 0.30 0.55 1.3 2.9 4.5 6.5 10.5 16
lb-ft 1.0 2.5 4.0 9.5 21.0 32.5 47.0 76.0 116.0
A equivalent of 6.8 strength
fastener without flange
N·m 2.4 4.7 8.4 20 42 80 125 193 280
kg-m 0.24 0.47 0.84 2.0 4.2 8.0 12.5 19.3 28
lb-ft 2.0 3.5 6.0 14.5 30.5 58.0 90.5 139.5 202.5
A equivalent of 6.8 strength
fastener with flange
N·m 2.4 4.9 8.8 21 44 84 133 203 298
kg-m 0.24 0.49 0.88 2.1 4.4 8.4 13.3 20.3 29.8
lb-ft 2.0 3.5 6.5 15.5 32.0 61.0 96.5 147.0 215.5
A equivalent of 7T strength
fastener
N·m 2.3 4.5 10 23 50 85 135 210 240
kg-m 0.23 0.45 1.0 2.3 5.0 8.5 13.5 21 24
lb-ft 2.0 3.5 7.5 17.0 36.5 61.5 98.0 152.0 174.0
A equivalent of 8.8 strength
fastener without flange
N·m 3.1 6.3 11 27 56 105 168 258 373
kg-m 0.31 0.63 1.1 2.7 5.6 10.5 16.8 25.8 37.3
lb-ft 2.5 4.5 8.0 19.5 40.5 76.0 121.5 187.0 270.0
A equivalent of 8.8 strength
fastener with flange
N·m 3.2 6.5 12 29 59 113 175 270 395
kg-m 0.32 0.65 1.2 2.9 5.9 11.3 17.5 27 39.5
lb-ft 2.5 5.0 9.0 21.0 43.0 82.0 126.5 195.5 286.0
✱: Self-lock nut