G643(E) Service Manual Chapter 1. General Information 11 General tightening torque for bolts, nuts and taperlock studs The following charts give the standard toque values for bolts, nuts and taperlock studs of SAE Grade 5 or better quality. Exceptions are given in other sections of the Service Manual where needed. thread size Standard torque inches Ib•ft. N•m* Use these torques for bolts and nuts with standard threads (con- versions are approximate).
standaed thread 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 9 ± 3 18 ± 5 32 ± 5 50 ± 10 75 ± 20 110 ± 15 150 ± 20 265 ± 35 420 ± 60 640 ± 80 800 ± 100 1000 ± 120 1200 ± 150 1500 ± 200 12 ± 4 25 ± 7 45 ± 7 70 ± 15 100 ± 15 150 ± 20 200 ± 25 360 ± 50 570 ± 80 875 ± 100 1100 ± 150 1350 ± 175 1600 ± 200 2000 ± 275 Use these torques for bolts and nuts on hydraulic valve bodies. 5/16 3/8 7/16 1/2 5/8 13 ± 2 24 ± 2 39 ± 2 60 ± 3 118 ± 4 20 ± 3 35 ± 3 50 ± 3 80 ± 4 160 ± 6 Use these torques for studs with taperlock threads.
taperlock stud 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 5 ± 2 10 ± 3 20 ± 3 30 ± 5 40 ± 5 60 ± 10 75 ± 10 110 ± 15 170 ± 20 260 ± 30 320 ± 30 400 ± 40 480 ± 40 550 ± 50 7 ± 3 15 ± 5 30± 5 40 ± 10 55 ± 10 80 ± 15 100 ± 15 150 ± 20 230 ± 30 350 ± 40 400 ± 40 550 ± 50 650 ± 50 750 ± 70 B80625X1