Torque dry Vs lubed chart

[Billzilla]

and with this image you can calculate it yourself

Yeah but I'm lazy, so you do it!

[Roadsailing]

do it up till it strips then back it off half a turn.

whats it for Bill?

[tut]

but would this be more helpful then?

http://www.derose.net/steve/resource...les/bolts.html

[Billzilla]

do it up till it strips then back it off half a turn.

whats it for Bill?

Just for my interest and to demonstrate to people how important it is to lubricate a bolt properly to get the correct clamping pressure.

but would this be more helpful then?

http://www.derose.net/steve/resource...les/bolts.html

No. :p

[tut]

screw you then

[OKE020]

Just dont take any chances, i just moly lube the fuck out of everything, threads, washers, nuts whatever

[Momus]

slight offtopic, forgive me or yell at me either way

i come from an industry where the mantra is grease the fuck out of it. if it metal on metal, grease it. If it has a thread grease it. If it needs locktite, grease it and locktite it. I realise alot of this is just passed down incorrectness, but for me when im working on engines and the like, im curious why i havnt seen ANY grease on bolt. So when stripping my 3sge of ancilliaries like ac, pwrstearing, etc all the bolts are dry.

I know there has to be a real smart reason for this, i just dont know what it is, any one know?

FWIW for the bolts i replaced that i felt needed it i lubed the base of the head, and locktite on the threads....

Good old cadmium plating is an assembly lubricant and found all the way up to quite high end aerospace fasteners.

[Buco_73]

Well lets take a stud for example. Fit nut and setup a dial gauge on end of stud, apply torque X with no oil, measure stud extension.
Then back off, lube everything or what ever you wish to test using the lube you want to test, then set up rig once more. Apply same torque and measure new extension on stud.

Given the stud has a fixed tensile strength after the first torque setup, the experiment should prove what you want to whom ever.
Or just calculate it.

Interesting, not many people think in the terms of clamping force which is what you are trying to achieve by applying a given torque.

[BENN0]

http://www.futek.com/boltcalc.aspx?mode=metric

Gives you a max torque reccomendation plus a nominal value. Not that helpful on its own, but it does list the tension in the bolt at these torque values on the results page. You can use this to show what impact friction has.
The K factor lets you play with friction due to lube.

[Billzilla]

This is pretty close to what I was after. It's from the Carol Smith "Engineer to win" book.

[Greg Rust]

This subject is one that I really like talking about but can easily go beyond the scope of this forum.

One of the biggest causes of gasket failure is due to inadequate clamping force by lack of tension created from excess friction due to lack of lubrication.

[morerevsm3]

This subject is one that I really like talking about but can easily go beyond the scope of this forum.

One of the biggest causes of gasket failure is due to inadequate clamping force by lack of tension created from excess friction due to lack of lubrication.

I always thought the main cause was listening to a rap song (bad tune) :w:

[Momus]

Not a chart though but you might try to Google; 'Bolt torque calculator-Engineers Edge if you want a Java Script clamp load calculator.

[Greg Rust]

I always thought the main cause was listening to a rap song (bad tune) :w:

50cents says it true

[<---cop]

screw you then

No, bolts.