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Torque figures indicated are valid for non-
greased or non-oiled threads and heads unless
otherwise specifi ed. Therefore, do not grease or
oil bolts or capscrews unless otherwise speci-
fi ed in this manual. When using locking
elements, increase torque values
by 5%.
* GRADE or CLASS value for bolts and cap-
screws are identifi ed by their head markings.
Torque Specifi cations
Bolt Torque for Metric bolts *
CLASS 8.8 CLASS 9.8 CLASS 10.9
“A” lb-ft (N.m) lb-ft (N.m) lb-ft (N.m)
6 9 (13) 10 (14) 13 (17)
7 15 (21) 18 (24) 21 (29)
8 23 (31) 25 (34) 31 (42)
10 45 (61) 50 (68) 61 (83)
12 78 (106) 88 (118) 106 (144)
14 125 (169) 140 (189) 170 (230)
16 194 (263) 216 (293) 263 (357)
18 268 (363) -- -- 364 (493)
20 378 (513) -- -- 515 (689)
22 516 (699) -- -- 702 (952)
24 654 (886) -- -- 890 (1206)
BOLT TORQUE TORQUE DATA FOR STANDARD
NUTS, BOLTS, AND CAPSCREWS.
Tighten all bolts to torques specifi ed in chart unless otherwise
noted. Check tightness of bolts periodically, using bolt chart
as guide. Replace hardware with same grade bolt.
NOTE: Unless otherwise specifi ed, high-strength Grade 5 hex
bolts are used throughout assembly of equipment.
Bolt Torque for Standard bolts *
GRADE 2 GRADE 5 GRADE 8
“A” lb-ft (N.m) lb-ft (N.m) lb-ft (N.m)
1/4” 6 (8) 9 (12) 12 (16)
5/16” 10 (13) 18 (25) 25 (35)
3/8” 20 (27) 30 (40) 45 (60)
7/16” 30 (40) 50 (70) 80 (110)
1/2” 45 (60) 75 (100) 115 (155)
9/16” 70 (95) 115 (155) 165 (220)
5/8” 95 (130) 150 (200) 225 (300)
3/4” 165 (225) 290 (390) 400 (540)
7/8” 170 (230) 420 (570) 650 (880)
1” 225 (300) 630 (850) 970 -(1310)
GRADE-2 GRADE-5 GRADE-8
8.8
CLASS 8.8 CLASS 9.8 CLASS 10.9
Important Notice!
Be sure towed vehicle is suitable or adaptable for towing.
A few models are not towable!
Be sure to check if towed vehicle requires additional equipment such as a
transmission lube pump, free-wheel hubs, driveline disconnect or axle locks. Failure to properly
equip towed vehicle will result in severe damage to towed vehicle’s
transmission.
Be sure that towed vehicle’s steering wheel is unlocked and free to turn. Check manufacturer’s
specifi cations for the proper way to unlock steering wheel.
Be sure to check that receiver on towing vehicle is not inset to far. When attaching a Demco towing
product it is important that turning clearance is adequate. A receiver that is inset to far on a towing
vehicle will shorten turning radius. Failure to check this may result in towing or towed vehicle to be
damaged. It may be necessary to install a receiver extension to allow for proper turning clearance.
9.8
10.9