Yield stresses of metric coarse bolts/kN (divide by 10 for tonnes, by 4.5 for kilopounds)
Bolt Size Grade 4.6 Grade 4.8 Grade 5.8 Grade 8.8 Grade 9.8 Grade 10.9 Grade 12.9
M1.6 0.32 0.43 0.5 0.8 0.9 1.14 1.4
M2 0.52 0.7 0.82 1.3 1.5 1.9 2.3
M2.5 0.85 1.2 1.3 2.2 2.4 3.0 3.7
M3 1.3 1.7 2.0 3.2 3.6 4.5 5.5
M3.5 1.7 2.3 2.7 4.3 4.8 6.1 7.5
M4 2.6 3.5 4.1 6.5 7.3 9.2 11
M5 3.6 4.8 5.6 9.0 10 13 16
M6 5 6.8 7.9 13 14 18 22
M8 9.2 12 14 23 26 33 40
M10 15 20 23 37 41 52 64
M12 21 29 33 54 60 75 93
M14 29 39 45 73 82 100 130
M16 39 53 62 100 110 140 170
M20 61 83 97 160 170 220 270
M24 88 120 140 220 250 320 390
M30 140 190 220 360 400 500 620
M36 200 280 320 520 580 730 900
M42 280 380 440 710 800 1000 1200
M48 370 500 580 930 1000 1300 1600
M56 510 690 800 1300 1400 1800 2200
M64 670 911 1100 1700 1900 2400 2900
M72 870 1200 1400 2200 2500 3100 3800
M80 1100 1400 1700 2800 3100 3900 4800