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GI-20 < HOW TO USE THIS MANUAL > TIGHTENING TORQUE OF STANDARD BOLTS The parts with aluminum or the cast iron washer surface/thread surface are excluded. NEW STANDARD BASED ON ISO CAUTION: 1. Use tightening torque with lubricant for the new standard bolts/nuts in principle. Friction coeffi- 2. However, use tightening torque without lubricant for the following cases. Friction coefficient stabi- - Grade 4.8, M6 size bolt, Conical spring washer installed - Paint removing nut (Size M6 and M8) for fixing with weld bolt Grade (Strength grade) Bolt Bolt di- mm Hexagonal width across flats mm Pitch mm Tightening torque Hexagon head bolt Hexagon flange bolt N·m kg-m ft-lb in-lb N·m kg-m ft-lb in-lb 4.8 M6 6.0 10 1.0 5.5 0.56 4 49 7 0.71 5 62 M8 8.0 13 1.25 13.5 1.4 10 — 17 1.7 13 — 1.0 13.5 1.4 10 — 17 1.7 13 — M10 10.0 16 1.5 28 2.9 21 — 35 3.6 26 — 1.25 28 2.9 21 — 35 3.6 26 — M12 12.0 18 1.75 45 4.6 33 — 55 5.6 41 — 1.25 45 4.6 33 — 65 6.6 48 — M14 14.0 21 1.5 80 8.2 59 — 100 10 74 — 4.8 M6 6.0 10 1.0 4 0.41 3 35 5.5 0.56 4 49 M8 8.0 13 1.25 11 1.1 8 — 13.5 1.4 10 — 1.0 11 1.1 8 — 13.5 1.4 10 — M10 10.0 16 1.5 22 2.2 16 — 28 2.9 21 — 1.25 22 2.2 16 — 28 2.9 21 — M12 12.0 18 1.75 35 3.6 26 — 45 4.6 33 — 1.25 35 3.6 26 — 45 4.6 33 — M14 14.0 21 1.5 65 6.6 48 — 80 8.2 59 — 8.8 M6 6.0 10 1.0 8 0.82 6 71 10 1.0 7 89 M8 8.0 13 1.25 21 2.1 15 — 25 2.6 18 — 1.0 21 2.1 15 — 25 2.6 18 — M10 10.0 16 1.5 40 4.1 30 — 50 5.1 37 — 1.25 40 4.1 30 — 50 5.1 37 — M12 12.0 18 1.75 70 7.1 52 — 85 8.7 63 — 1.25 70 7.1 52 — 85 8.7 63 — M14 14.0 21 1.5 120 12 89 — 140 14 103 — 10.9 M6 6.0 10 1.0 10 1.0 7 89 12 1.2 9 106 M8 8.0 13 1.25 27 2.8 20 — 32 3.3 24 — 1.0 27 2.8 20 — 32 3.3 24 — M10 10.0 16 1.5 55 5.6 41 — 65 6.6 48 — 1.25 55 5.6 41 — 65 6.6 48 — M12 12.0 18 1.75 95 9.7 70 — 110 11 81 — 1.25 95 9.7 70 — 110 11 81 — M14 14.0 21 1.5 160 16 118 — 180 18 133 — |