Tow Ball bolts-torque
- Thread starter Morganic
- Start date
Check this page it may help http://www.buypartsby.co.uk/towbar-fitting/PFC3Q.pdf Have a look at the materials then at the bottom of the fitting piece you will find the torque settings, I have no idea if these figures would apply to all tow bars or not.
Commonly used towball bolts are high tensile grade 8.8 M16mm, 8.8 you will find embossed on the head, the correct maximum torque for these is 143ftlb or 190nm
Commonly used towball bolts are high tensile grade 8.8 M16mm, 8.8 you will find embossed on the head, the correct maximum torque for these is 143ftlb or 190nm
Looks like we're all about right. I said 220Nm, The Plotter gave 240Nm and Gary 190Nm. Gives an average of about 215Nm so plus/minus 20 on that just about covers all.
ps: The unit is Nm with a capital 'N' not nm as that is something else, a nanometer. Besides, Newton would be turning in his grave if he knew that his name were written with a paltry small 'n'.
ps: The unit is Nm with a capital 'N' not nm as that is something else, a nanometer. Besides, Newton would be turning in his grave if he knew that his name were written with a paltry small 'n'.
Now i know i am going off course a little with this but it has a connection to the subject.Many many years ago i had a A J S motorcycle and the magneto had cog that had to be tighten to a specific torque, i cannot rememer how i worked it out at the time but by using a spanner with a 1lb of sugar on the end of the spanner i got the right toque, something like 1foot per pound.Any thoughts on simularity?.
Thanks to all who responded. Have also located details from towbar manufacturer who recommend 252 Nms-186 ft lbs. Bearing in mind what Gary says should I tighten the bolts this tight?
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