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    Thread: Dry Torque versus Wet Torque

    1. 03-25-2009 03:28 PM #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?


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      03-25-2009 03:30 PM #2
      wet= lubed = tighter
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    3. 03-25-2009 03:31 PM #3
      Quote, originally posted by Noobercorn »
      wet= lubed = tighter

      can we say by how much?


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      03-25-2009 03:40 PM #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

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    5. Member sdezego's Avatar
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      03-25-2009 03:58 PM #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

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      03-25-2009 06:09 PM #6
      Quote, originally posted by sdezego »

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


    7. 03-25-2009 07:49 PM #7
      Did someone say wet?

    8. Member xtremevdub's Avatar
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      03-25-2009 08:03 PM #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. Member twinrado's Avatar
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      03-26-2009 04:57 AM #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.)

      Here are some links to help you out but you might go mad looking over it
      http://www.albatros-ul.dk/?dow...g.pdf

      And this tool help so you dont have to do the calculations yourself but pricey.
      http://buy1.snapon.com/catalog...l=all





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

      There's no such thing as too much of anything but to little results in the need for more.

    10. 03-26-2009 12:22 PM #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.


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      03-26-2009 12:32 PM #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


    12. 03-26-2009 12:34 PM #12
      then...

      wet will torque at a greater value than dry...

      i am thinking backwards and mathing it wrong?


    13. 03-26-2009 12:35 PM #13
      then...

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


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      03-26-2009 12:58 PM #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)

      Turbos, Timepieces and Firearms.

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      03-26-2009 12:59 PM #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...

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    16. Member twinrado's Avatar
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      03-26-2009 04:20 PM #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.

      There's no such thing as too much of anything but to little results in the need for more.

    17. Member corrado-correr's Avatar
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      03-26-2009 04:33 PM #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
      cadmium-plated: K = 0.16
      lubricated: K = 0.15 ~ 0.18

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    18. Member corrado-correr's Avatar
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      03-26-2009 04:36 PM #18
      Quote, originally posted by Noobercorn »

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

      Correct!!

      Raven
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      03-27-2009 06:36 AM #19
      Quote, originally posted by Noobercorn »
      wet= lubed = tighter

      i swear i already said this in this thread...........

      Turbos, Timepieces and Firearms.

    20. 03-27-2009 09:47 AM #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?


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