www.WorkshopManuals.co.uk Torque Settings Use only where no torque setting is specified in the text. Values are for dry threads and may be within three per cent of the figures stated. For lubricated threads the values should be REDUCED by one third.
UNF Grade 'S' Bolts Bolt Size Hexagon (A/F) Torque Settings in (mm) in Nm kgf m lbf ft 1/4 (6.3) 7/16 14 1.4 10 5/16 (7.9) 1/2 28 2.8 20 3/8 (9.5) 9/16 49 5.0 36 7/16 (11.1) 5/8 78 8.0 58 1/2 (12.7) 3/4 117 12.0 87 9/16 (14.3) 13/16 170 17.3 125 5/8 (15.9) 15/16 238 24.3 175 3/4 (19.0) 11/8 407 41.5 300 7/8 (22.2) 15/16 650 66.3 480 1 (25.4) 11/2 970 99.0 715 11/4 (31.7) 17/8 1940 198.0 1430 11/2 (38.1) 21/4 3390 345.0 2500 Metric Grade 8.8 Bolts Bolt Size Hexagon (A/F) Torque Settings (mm) mm Nm kgf m lbf ft M5 (5) 8 7 0.7 5 M6 (6) 10 12 1.2 9 M8 (8) 13 28 3.0 21 M10 (10) 17 56 5.7 42 M12 (12) 19 98 10 72 M16 (16) 24 244 25 180 M20 (20) 30 476 48 352 M24 (24) 36 822 84 607 M30 (30) 46 1633 166 1205 M36 (36) 55 2854 291 2105 Rivet Nut Bolts/Screws Bolt Size Torque Settings (for steel rivet nuts) (mm) Nm kgf m lbf ft M3 (3) 1.2 0.12 0.9 M4 (4) 3.0 0.3 2.0 M5 (5) 6.0 0.6 4.5 M6 (6) 10.0 1.0 7.5 M8 (8) 24.0 2.5 18.0 M10 (10) 48.0 4.9 35.5 M12 (12) 82.0 8.4 60.5 Note:
All bolts used on JCB machines are high tensile and must not be replaced by bolts of a lesser tensile specification. 9803/3280 Purchased from www.WorkshopManuals.co.uk Issue 1 Section 1 General Information Section 1 2 - 1 2 - 1