40 replies to this topic

[Deeppockets]

The shank diameter is the first column and for Grade 5 UNF and 8.8 Metric tensile which are approximately equivalent. The second column is the common hex head size in mm for the shank with the third column the spanner/socket usage.
 
The above figures are for dry fitment as torque loading also dependent on whether the threads are dry or lubricated. Here is useful site which has a bit on on thread lubrication types and effects: http://home.jtan.com...KIAT/kiat_2.htm .

 

So, for example, a general purpose 1/2" AF Grade 5 bolt will have a shank of 5/16" and a dry torque setting of 18 lb-ft.

[Abbot]

Now I am confused. I am rebuilding my engine and have just Torqued up the head to the values shown in my Haynes manual.  The values are for first stage 25 lbf ft and then the final stage of 50 lbf ft  .  The data sheet at the start of this thread shows 40 lbf ft as the final stage.

 

When I did apply 50 bf ft it was obvious to me that the resistance was not increasing and the wrench did not click.

So I think I have over stretched the bolts and not achieved the torque.  

 

Any ideas why the Haynes manual can be so wrong? or have I done something else that is stupid like oil on the threads.

[MRA]

Now I am confused. I am rebuilding my engine and have just Torqued up the head to the values shown in my Haynes manual.  The values are for first stage 25 lbf ft and then the final stage of 50 lbf ft  .  The data sheet at the start of this thread shows 40 lbf ft as the final stage.

 

When I did apply 50 bf ft it was obvious to me that the resistance was not increasing and the wrench did not click.

So I think I have over stretched the bolts and not achieved the torque.  

 

Any ideas why the Haynes manual can be so wrong? or have I done something else that is stupid like oil on the threads.

 

40 is the old figure 50 is the later figure for studs with crows feet on the end

[Abbot]

What is    'a crows foot on the end" ?

[MRA]

What is    'a crows foot on the end" ?

Its more a Y than a crows foot but these are the later stronger head studs

[Abbot]

ok thanks job done at 50 and no problems this time. Thanks

[rider4life]

thanks

[Uxmini]

Is the wheel lug nut torque setting of 40-45 ft. lbs the same for steel wheels and alloys and for 10", 12" and 13" wheels?

 

[geroch]

pdf available again

Attached Files

•  MiniTorquesv1.pdf   520.7K   375 downloads

[MikeJE]

Thanks for the pdf, a really useful table. I see that it suggests 50 lb ft for wheel nuts, but I have 10" alloy minilites and I wondered if this value is too high (similar question to Uxmini on 21 April 2018)?

 

Grateful for advice

 

Best wishes

 

Mike

[geroch]

Aluminum wheels are 37 lbft

 

Gero

Thanks for the pdf, a really useful table. I see that it suggests 50 lb ft for wheel nuts, but I have 10" alloy minilites and I wondered if this value is too high (similar question to Uxmini on 21 April 2018)?

 

Grateful for advice

 

Best wishes

 

Mike