d1 d2 k max. Phillips m approx. t min. t max. Proof Load N M1.6 3.2 1.42 0 1.8 0.72 1.02 370 M2 4 1.72 1 2.5 1.1 1.4 600 M2.5 5 2.12 1 2.7 1.3 1.6 990 M3 6 2.52 1 3.1 1.7 2 1560 M3.5 7 2.82 2 4.2 1.74 2.24 2100 M4 8 3.25 2 4.6 2.04 2.54 2720 M5 10 3.95 2 5.3 2.77 3.27 4400 M6 12 4.75 3 6.8 3.03 3.53 6230 M8 16 6.15 4 9 4.18 4.68 11400 M10 20 7.68 4 10.2 5.38 5.88 18000