Fastener Size
(-in.)
Tightening
Specification lb-ft
(N•m)
3/4 290-340 (394-462)
7/8 380-460 (517-626)
1 700-830 (952-1,129)
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)
Tightening
Specification lb-ft
(N•m)
M5 6-9 (8-12)
M6 7-11 (9-15)
M8 17-23 (23-31)
Where fasteners with all-metal lock-
nuts are indicated in the following
table
• Do not lubricate these fasteners.
• Bolts and washers can be reused,
but nuts can only be reused once.
If in doubt, install new nuts.
• If a bolt must be replaced, then
nuts and bolts must be replaced in
pairs.
• Fasteners must be torqued from
the nut to achieve correct clamp
load.
Metric Fastener
Size (with all
METAL Lock-
nuts)
Tightening
Specification lb-ft
(N•m)
M10 29-41 (39.4-55.6)
M12 51-69 (69.1-93.5)
M16 125-165
(169.5-223.7)
M20 230-300
(311.8-406.8)
Suspension U-Bolts, Grade 8
Tighten all U-bolts with a torque wrench.
Torque requirements in the table below
apply to PACCAR proprietary suspensions
using Protec Torque/TEXO coated U-bolts,
only. For all other suspensions, follow the
manufacturer's recommended torque
values. PACCAR proprietary suspension u-
bolts must be tightened in a specific
sequence. Take your vehicle to an
authorized dealer to tighten the U-bolts on
your vehicle.
Torque for Grade 8 U-Bolts
Peterbilt Front Suspension U-bolts
U-Bolt Size
Diameter (-
in.)
Torque (lb-
ft)
Torque
(N•m)
3/4 260-290 353-393
7/8 370-415 502-563
For all non-PACCAR suspension
systems, see the manufacturer’s
operator’s manual for torque
specifications.
MAINTENANCE - Specification Reference Charts
280 Y53-6076-1D1 (09/20)
5
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