76347-385 • 06 -15
4.6
Making sure that all the bolts are regularly checked and tightened to the
proper torque is critical. The chart below shows the proper torque relative to
the bolt size and type. When using this chart, keep the following guidelines
in mind:
• The values in the chart are based on use of clean, dry threads
• Use the next higher torque value when specific torque values are not
available
• When replacing a cap screw with a higher grade, use the torque
specifications of the new screw
• Do not use the torque values shown in this chart in place of those
specified in other sections of the manual
• When oil is used as a lubricant, reduce the torque by 10%
• When using new plated cap screws, reduce the torque by 20%
• Use the Grade 5 torque chart when using cap screws that are threaded
into aluminum. These may require reductions in torque of 30% or more
and must attain two cap screw diameters of thread engagement
• When using rivet nuts, do not exceed 25 ft-lb of torque
Bolts & Torque
Table 4.3 • Torque Guides
Grade 5 - Coarse Thread
Size Clamp Load Plain Plated
1/4-20 (.250) 2,025 8 ft-lb 76 in-lb
5/16-18 (.3125) 3,338 17 ft-lb 13 ft-lb
3/8-16 (.375) 4,950 31 ft-lb 23 ft-lb
7/16-14 (.4375) 6,788 50 ft-lb 37 ft-lb
1/2-13 (.500) 9,075 76 ft-lb 57 ft-lb
9/16-12 (.5625) 11,625 109 ft-lb 82 ft-lb
5/8-11 (.625) 14,400 150 ft-lb 112 ft-lb
3/4-10 (.750) 21,300 266 ft-lb 200 ft-lb
7/8-9 (.875) 29,475 430 ft-lb 322 ft-lb
1-8 (1.000) 38,625 644 ft-lb 483 ft-lb
1 1/8-7 (1.125) 42,375 794 ft-lb 596 ft-lb
1 1/4-7 (1.250) 53,775 1120 ft-lb 840 ft-lb
1 3/8-6 (1.375) 64,125 1470 ft-lb 1102 ft-lb
1 1/2-6 (1.500) 78,000 1950 ft-lb 1492 ft-lb
Size Clamp Load Plain Plated
1/4-28 (.250) 2,325 10 ft-lb 87 in-lb
5/16-24 (.3125) 3,675 19 ft-lb 14 ft-lb
3/8-24 (.375) 5,588 35 ft-lb 26 ft-lb
7/16-20 (.4375) 7,575 55 ft-lb 41 ft-lb
1/2-20 (.500) 10,200 85 ft-lb 64 ft-lb
9/16-18 (.5625) 12,975 122 ft-lb 91 ft-lb
5/8-18 (.625) 16,350 170 ft-lb 128 ft-lb
3/4-16 (.750) 23,775 297 ft-lb 223 ft-lb
7/8-14 (.875) 32,475 474 ft-lb 355 ft-lb
1-12 (1.000) 42,300 705 ft-lb 529 ft-lb
1-14 (1.000) 32,275 721 ft-lb 541 ft-lb
1 1/8-12 (1.125) 47,475 890 ft-lb 668 ft-lb
1 1/4-12 (1.250) 59,550 1241 ft-lb 930 ft-lb
1 3/8-12 (1.375) 72,975 1672 ft-lb 1254 ft-lb
1 1/2-12 (1.500) 87,750 2194 ft-lb 1645 ft-lb
Grade 5 - Fine Thread
General Maintenance • Bolts & Torque
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