J&M HT-974 - Bolt Torque Chart; Stud and Wheel Nut Torque Specifications

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Always tighten hardware to these values unless a dierent torque or tightening procedure is listed for specic application. Fasteners must
always be replaced with the same grade as specied in the manual parts list. Always use the proper tool for tightening hardware. Make
sure fastener threads are clean and you start thread engagement properly. Use these values when tightening all bolts and nuts with
the exception of wheel nuts.
SAE Fasteners
Coarse Thread Series
Grade 5 Grade 8
Diameter and Pitch (Inches) Dry Oiled Dry Oiled
1/4”-20 8 ft-lbs 6 ft-lbs 12 ft-lbs 9 ft-lbs
5/16”-18 17 13 25 18
3/8”-16 31 23 44 33
7/16”-14 49 37 70 52
1/2”-13 75 57 106 80
9/16”-12 109 82 154 115
5/8”-11 150 113 212 159
3/4”-10 267 200 376 282
7/8”-9 429 322 606 455
1”-8 644 483 909 681
Fine Thread Series
Diameter and Pitch (Inches) Dry Oiled Dry Oiled
1/4”-28 10 ft-lbs 7 ft-lbs 14 ft-lbs 10 ft-lbs
5/16”-24 19 15 27 20
3/8”-24 35 26 49 37
7/16”-20 55 41 78 58
1/2”-20 85 64 120 90
9/16”-18 121 91 171 128
5/8”-18 170 127 240 180
3/4”-16 297 223 420 315
7/8”-14 474 355 669 502
TIGHTENING WHEEL NUTS: Standard 1/2” wheel studs and nuts should be tightened to torque 120 ft-lbs. During initial operation
of the header transport and then checked for proper torque after every 10 hours of use. Failure to do so may damage wheel nut seats.
Once seats are damaged, it will become impossible to keep nuts tight.
Stud and Wheel Nut Torque Specications
Always tighten hardware to these values unless a dierent torque or tightening procedure is listed for specic application. Fasteners must
always be replaced with the same grade as specied in the manual parts list. Always use the proper tool for tightening hardware. Make
sure fastener threads are clean and you start thread engagement properly. Use these values when tightening all studs and wheel
nuts.
Stud Tightening Torque
1/2”-20 120 ft-lbs
9/16”-18 170 ft-lbs
5/8”-18 300 ft-lbs
3/4”-16 400 ft-lbs
20mm 475 ft-lbs
22mm 640 ft-lbs
Safety Rules
Bolt Torque Chart
Make sure that the implement is fastened securely to the tractor by using the proper hich pin, clip and safety chains.
Before unhooking the implement from the towing unit, be sure to properly block the wheels to prevent the implement from moving.
Never overload the header transport. Overloading the header transport is dangerous and can cause extensive damage.
Do NOT exceed speeds in excess of 25 MPH. The header transport is designed for heavy loads at slow speeds. Also be sure slow moving
vehicle emblem is attached to rear of wagon.
IMPORTANT: Use caution when transporting. Be alert of the transport unit’s overall width when approaching obstacles, such as post signs
and poles, along the road. Check the transport width of the unit to ensure clearance before entering bridges.
COMPLY WITH ALL SAFETY WARNINGS AND CAUTIONS IN THIS MANUAL AND IN THE COMBINE OPERATOR’S MANUAL.
WARNING: BE SURE ALL LIGHTS ARE WORKING PROPERLY BEFORE HIGHWAY TRAVEL.