IMT CAS440HU, Manual, Page: 33 / 34

Parts 31
Thread Torque Charts
FINE THREAD BOLTS (ENGLISH) COARSE THREAD BOLTS (ENGLISH)
SIZE BOLT
DIA. GRADE 5
SAE J429
GRADE 5
GRADE 8
SAE J429
GRADE 8
SIZE BOLT
DIA. GRADE 5
SAE J429
GRADE 5
GRADE 8
SAE J429
GRADE 8
(DIA-TPI) (INCHES) PLAIN PLATED PLAIN PLATED (DIA-
TPI) (INCHES) PLAIN PLATED PLAIN PLATED
(FT-LB) (FT-LB) (FT-LB) (FT-LB) (FT-LB) (FT-LB) (FT-LB) (FT-LB)
5/16-24 0.3125 19 14 27 20 5/16-18 0.3125 17 13 25 18
3/8-24 0.375 35 26 49 35 3/8-16 0.375 31 23 44 33
7/16-20 0.4375 55 41 78 58 7/16-14 0.4375 49 37 70 52
1/2-20 0.5 90 64 120 90 1/2-13 0.5 75 57 105 80
9/16-18 0.5625 120 90 170 130 9/16-12 0.5625 110 82 155 115
5/8-18 0.625 170 130 240 180 5/8-11 0.625 150 115 220 160
3/4-16 0.75 300 225 420 315 3/4-10 0.75 265 200 375 280
7/8-11 0.875 445 325 670 500 7/8-9 0.875 395 295 605 455
1-12 1 645 485 995 745 1-8 1 590 445 910 680
1 1/8-12 1.125 890 670 1445 1085 1 1/8-7 1.125 795 595 1290 965
1 1/4-12 1.25 1240 930 2010 1510 1 1/4-7 1.25 1120 840 1815 1360
1 3/8-12 1.375 1675 1255 2710 2035 1 3/8-6 1.375 1470 1100 2380 1780
1 1/2-12 1.5 2195 1645 3560 2670 1 1/2-6 1.5 1950 1460 3160 2370
NOTES
1 Tightening torques provided are midrange.
2 Consult bolt manufacturer’s particular specifications, when provided.
3 Use flat washers of equal strength.
4 All torque measurements are given in foot-pounds.
5 Torque values specified are for bolts with residual oils or no special lubricants applied. If special lubricants of
high stress ability, such as Never-Seez compound graphite and oil, molybdenum disulphite, collodial copper or
white lead are applied, multiply the torque values in the charts by the factor .90. The use of Loctite does not affect
the torque values listed above.
WARNING
Anytime a gear-bearing bolt is removed, it must be replaced with a new bolt of the identical
grade and size. Once a bolt has been torqued to 75% of its proof load and then removed, the
torque coefficient may no longer be the same as when the bolt was new thus giving
indeterminate clamp loads after torquing. Failure to replace gear-bearing bolts may result in bolt
failure due to metal fatigue causing death or serious injury.