5. SPECIFICATIONS
5.3 FASTENER TORQUE SPECIFICATIONS
The amount of twisting force (torque) on a bolt or screw is normally measured by
the use of a torque wrench. The correct tightening of bolts is one of the most sin-
gularly important operations done when repairing or conducting maintenance on
your unit. The correct torque can eliminate deformation of mating surfaces.
Virtually every bolt and screw on an engine or component has a torque specifica-
tion for correct tightening. It is imperative that the manufacturer's recommendation
be followed for correct tightening sequence and tightness to eliminate problems
created by bolts and screws being too tight or too loose.
S.A.E. Bolt Grade and Recommended Torque Chart
Shaker
head Bolt & Torque
Bolt, Hex 1/2” UNC GR 5 PL / Nut Flexloc 1/2” - 55 ft. lbs.
Bolt, Hex 5/8” UNC GR 5 PL / Nut Flexloc 5/8” - 95 ft. lbs.
Bolt, Hex 3/4” UNC GR 5 PL / Lock Nut 3/4” - 260 ft. lbs.
70
1 or 2 5 6 8
1/4 5 Ft 7 Ft. 10 Ft. 10.5 Ft. 11 Ft.
DIA lbs. lbs. lbs. lbs. lbs.
5/16 9 14 19 22 24
3/8 15 25 34 37 40
7/16 24 40 55 60 65
1/2 37 60 85 92 97
9/16 53 88 120 132 141
5/8 74 120 167 180 192
3/4 120 220 280 286 316
7/8 190 302 440 473 503
1 282 466 660 714 771
RECOMMENDED
FOR COMPETITION
AND CRITICAL USE
S.A.E.
GRADE
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