FOREWORD STANDARD TIGHTENING TORQUE 12 HYDRAULIC TUBES AND FITTINGS 00 The torque figures are recommended for plain, cadmium or zinc plated fittings, dry or wet installations. Swivel nuts either swaged or brazed. Figures are for tube nuts used with 37° flared fittings and JIC - 37° seat o-ring boss plugs and swivel nuts. HOSE CLAMPS 00 This chart provides the tightening torques for hose clamps used in all rubber applications (radiator, air cleaner, operat- ing lever boots, hydraulic system, fuel systems etc.). SPLIT FLANGE CONNECTIONS 00 The following chart provides the tightening torques for split flange connections used in hydraulic systems.
Flanges and fitting shoulders should fit squarely. Install all bolts, finger tight, then torque evenly. Over torquing bolts will damage the flanges and/or bolts, which may cause leakage.
PC300LL-6 00-15 Tube Nuts O-ring Boss Plugs And Swivel Nuts For 37° Flared Fitting JIC 37° Seat Size Tubing OD Thread N•m lbf ft 4 1/4 7/16-20 12 to 16 9 to 12 5 5/16 1/2-20 16 to 20 12 to 15 6 3/8 9/16-18 33 to 21 21 to 24 8 1/2 3/4-16 47 to 54 35 to 40 10 5/8 7/8-14 72 to 79 53 to 58 12 3/4 1-1/16-12 104 to 111 77 to 82 14 7/8 1-3/16-12 122 to 136 90 to 100 16 1 1-5/16-12 149 to 163 110 to 120 20 1-1/4 1-5/8-12 190 to 204 140 to 150 24 1-1/2 2-1/2-12 217 to 237 162 to 175 32 2 2-1/2-12 305 to 325 225 to 240 Clamp Type and Size Torque ± 0.6 N•m (5 lbf in) Hydraulic System All Others N•m lbf in N•m lbf in T Bolt --- --- 6.2 to 7.3 55 to 65 Worm drive under 1-3/4 in open diameter 4.5 to 5.6 40 to 50 2.2 to 3.3 20 to 30 Worm drive over 1-3/4 in open diameter --- --- 4.5 to 5.6 40 to 50 Worm drive all Ultra-Tite 4.5 to 5.6 40 to 50 10.7 to 11.8 95 to 105 Flange Size Bolt Size Bolt Torque N•m lbf ft 1/2 5/16 20 to 24 15 to 18 3/4 3/8 30 to 37 22 to 27 1 3/8 37 to 47 27 to 35 1-1/4 7/16 47 to 61 35 to 45 1-1/2 1/2 62 to 79 46 to 58 2 1/2 75 to 88 55 to 65 2-1/2 1/2 107 to 123 79 to 91 3 5/8 187 to 203 138 to 150 3-1/2 5/8 159 to 180 117 to 133