Frame Fastener Torque
Requirements
CAUTION
Incorrectly tightening the fasteners may
result in failure of the fastener or incor-
rect clamp loads. Fastener failure may
lead to frame failure. Failure to comply
may result in equipment or property
damage.
• Use a torque wrench for final
tightening of these fasteners.
Because of the coating on the
threads of these bolts, be aware
that if an impact gun is used to
tighten the fasteners, they may
over-torque and break.
•
When torquing, the nut must ro-
tate slightly before achieving the
torque value. If the nut does not
rotate, the fastener is over-tor-
qued and should be replaced.
• To achieve correct clamp loads,
the frame fasteners must be tor-
qued with the nut. The intended
clamp load may not be achieved
if the nut is held and torque is
applied to the bolt.
Nylon lock-nuts (AKA, "ESNA" or
"nyloc")
Standard Grade 8 UNF or UNC Nylon
Lock-Nuts:
Standard
Fastener Size [-
in.] (with NYLON
insert nuts)
T
ightening
Specification lb-ft
(N•m)
5/16 16-22 (22-30)
3/8 30-40 (41-54)
7/16 55-65 (75-88)
1/2 80-90 (109-122)
9/16 115-140 (156-190)
5/8 165-195 (224-265)
3/4 290-340 (394-462)
7/8 380-460 (517-626)
1 700-830
(952-1,129)
Standard
Fastener Size [-
in.] (with NYLON
insert nuts)
T
ightening
Specification lb-ft
(N•m)
1-1/8 990-1,170 (1,346-
1,591)
1-1/4 1,380-1,630
(1,877- 2,217)
Metric Fastener
Size (with NYLON
insert-nuts)
T
ightening
Specification lb-ft
(N•m)
M5 6-9 (8-12)
M6 7-11 (9-15)
M8 17-23 (23-31)
General considerations when using
Standard Grade 8 UNF or UNC Nylon
Lock-Nuts:
• Use only lock-nut with nylon insert.
•
Lubricate nylon insert nut lightly
with SAE 20W or 30W oil.
SPECIFICATIONS - Frame Fastener Torque Requirements
Y53-1349-1A1 (02/2022) 63
7
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