Bolt sizing and other info.
 

Since I've been doing quite a bit of work on this recently, here are some nice links I've found:

Thread sizing:
http://www.boltdepot.com/fastener-in...aspx#measuring

also - easy metric version
http://www.raygirling.com/metthrpt.htm

Printable gaugs and tools:
http://www.boltdepot.com/fastener-in...ner-Tools.aspx

"Recommended Torque Table"

Careful boys and girls.............

http://www.boltdepot.com/fastener-in...ed-Torque.aspx

Good luck ! Frank

Also, remember that the above torque values are for dry assembly only.

In general, a thread treated with either an anti-seize or a lubricant requires a lower torque value (than a higher-friction dry thread) to create the same tension in the fastener. So, if you make a modification that changes a component material, such that anti-seize is now needed, you’ll need to torque the fastener to a approximately 10% lower value (according to the Machinery Handbook, 25th ed.) to avoid over-tensioning the fastener.

So check your Service Manual. Some fasteners need to be assembled using a lubricant (such as the rear axle nut) and the torque spec reflects this.

Wise words as always Sire.

In a recent work based workshop I was taught to torque (with admittedly much higher values) in three stages....

1st stage - 33% of total value
2nd stage - 66%
3rd - ok yep, you guessed

Seems to work reasonably well on bigger bolts as I've not stripped anything - YET !!! :devil:

When you look at the torque settings in the manual (916) alot of them are say 20 - (divide sign) 23 nm, I haven’t seen this before does it mean that this is the range or a 2 stage torque?

I've always taken this this to be a torque range - but even that poses yet more questions....

Which value to torque up to??? Min or Maximum ??? I've used both median and minimum values (with loctite where important) and managed to be ok so far....

Another interesting one for Shazaam....

Exit stage Left......Frank.