VWVortex.com - Dry Torque versus Wet Torque

# Thread: Dry Torque versus Wet Torque

1. What is the difference between torquing a bolt dry and torquing a bolt wet?
Say a bolt is said to be needed to be torqued to 80 ft. lbs. dry. What happens when the bolt is torqued to 80 ft. lbs. but wet?

2. wet= lubed = tighter

3.  Quote, originally posted by Noobercorn » wet= lubed = tighter

can we say by how much?

4. there is actually an equation based on the lubricating properties of whatever you use (like the ARP mollu stuff, or WD40) that is a multiplier for applied tq, but i have no cloo what it is.
why the hell do you need it anyway? make **** tight, and call it a day

5.  Quote, originally posted by Noobercorn » make **** tight, and call it a day

..tighten it up 'til is snaps and then back off a half

6.  Quote, originally posted by sdezego » ..tighten it up 'til is snaps and then back off a half

7. Did someone say wet?

8.  Quote, originally posted by Noobercorn » wet= lubed = tighter

Dont belive this guy... he oviously has his equation wrong!!
wet= lubed = looser... I promise you!

9. Now this is the old Tex am used to, \$h!t thats out of content but it still makes you . Anyways most of you guys have been here quite a long time.
Who had the sig that goes something like this "I could hear a pop when you took your ____ out of your mouth to type"
Back to the topic:
Ill have something more for you tomorrow trying to explain the differences but the link to download the chart should help a little.
(You best bet is to clean the fasteners then lube them with something that is compatible with your PHYSICAL ENVIRONMENT and then lube them with something that is consistent.)
http://www.albatros-ul.dk/?dow...g.pdf
And this tool help so you dont have to do the calculations yourself but pricey.

Modified by twinrado at 5:08 AM 3-26-2009

10. so a wet torque value is less than a dry torque value?
somehow that doesn't make sense...
x.7 of the torque being applied is actually created?
while x 1.0 is only with a dry torque?
then, 80 ft lbs becomes 58 ft lbs given "wet," say antisieze.

11. No it makes sense.
It takes a higher effort to move your hand across dry glass vs wet glass.
It's all about accounting for friction [IMG]http://*****************.com/smile/emthup.gif[/IMG]

12. then...
wet will torque at a greater value than dry...
i am thinking backwards and mathing it wrong?

13. then...
80 ft lbs times the coefficient of .7 is actually 136 ft lbs

14.  Quote, originally posted by xtremevdub » Dont belive this guy... he oviously has his equation wrong!! wet= lubed = looser... I promise you!

wet = lubed= *you will get the bolt* tighter (with the same applied force)

15.  Quote, originally posted by twinrado » Who had the sig that goes something like this "I could hear a pop when you took your ____ out of your mouth to type" [/url]

that would be me, from many moons ago. that was a great sig come to think of it. "i could actually hear the pop when you took the **** out of your mouth to type"
lol, i wish i could remember who i quoted on that...

16. Yeah I loved that sig, the first time i saw it I also died of .
 Quote, originally posted by Noobercorn » wet = lubed= *you will get the bolt* tighter (with the same applied force)

When it comes to wet / dry torguing the the same force will always be the same. So if i torgued something at 80lbs it will be the same for both. The difference is the friction. Dry torguing will apply more friction on the surface/threads as with wet torquing it will be tighter but the friction on the surface/thread wont be tight mean not alot of force is needed for the bolt to be removed. also wet torquing will change the pitch of your threads greater than dry torquing will. Thats why in the industrial field dry torquing is used because they dont want the bolt coming loose on them. As with the automotive field bolt are removed and replace alot more frequently and that why they use wet torquing. Hope this helps. Also with wet torquing after you torque something to 80lbs your suppose to turn it an extra 1/4 turn.

17. Nobody uses efunda.com anymore? kids these days... goosh.
http://www.efunda.com/designst...o.cfm

where d is the nominal outside diameter of the bolt and K is the correction factor that depends on the material, size, surface friction, and threading of the bolt. For most small to mid size bolts, K is between 0.15 and 0.3.
As a rough approximation:
dry (un-lubricated) mid-size steel bolts: K = 0.2
non-plated black finish: K = 0.3
zinc-plated: K = 0.2
lubricated: K = 0.15 ~ 0.18

18.  Quote, originally posted by Noobercorn » wet = lubed= *you will get the bolt* tighter (with the same applied force)

Correct!!

19.  Quote, originally posted by Noobercorn » wet= lubed = tighter

20. ok, ok...
noober...
i know, but it doesn't hurt to have everyone yell at me for the same things!
besides, everyone has contributed something a little different...it's cool bro!

thanks everyone!
anyone else want to add something?