Tow Ball bolts-torque

[Morganic]

Can someone please tell me at what torque I should set tow ball bolts at?

 

[Martin_E]

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.

 

[Lutz]

Assuming you have M16 Grade 8.8 bolts with a coarse thread, a torque of 220

 

[ThePlotter]

I have just looked at my spare ball! and it has a label saying tighten to 240nm.

 

[gary]

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

 

[gary]

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

 

[Lutz]

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'.

 

[Robert_374242026]

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?.

 

[Lutz]

1 Newton metre = 0.738 foot pounds

 

[Martin_E]

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'.

That would make the 214 Nm almost spot on in the link that I gave.

Martin "E"

 

[Robert_374242026]

1 Newton metre = 0.738 foot pounds

Thanks Lutz.

Robert

 

[Morganic]

1 Newton metre = 0.738 foot pounds

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?