Full Answer
What is the difference between dry and wet bolt torque?
Because friction is such a big factor in bolt torque, it is important to know the difference between applying torque to a dry bolt and a wet bolt. Using oil, anti-seize or other types of thread lubricant is a common practice, but an understanding that wet threads require less torque than dry threads because of friction is very important.
When is a torque figure considered dry?
...the first time that you torque a fastener past the yield point it won't necessarily fail, but it might fail on the nth time...! I have always understood if there is no mention of a lubricant then the torque figure is considered dry.
Do wet threads require less torque?
Using oil, anti-seize or other types of thread lubricant is a common practice, but an understanding that wet threads require less torque than dry threads because of friction is very important.
Is 79 lbs torque wet or dry torque?
I oil my lugs all the time, so that would be WET torque. Still, if the lugs go on at 79ft pounds (example), it will be 79ft lbs wet or dry, the reading on the wrench will be the same. You may be thinking it's a TAD tighter wet torque, but 79lbs is 79lbs wet or dry. Wet is always better.
What end should I use for thread lubricant?
Why is an angle required for a fastener?
Why do new fasteners need to be tightened?
Will Eng tips check this out?
Is it important to know the boundary conditions that are assumed for specified torque values?
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What is the difference between dry and lubricated torque?
Dry bolt torque is approximately 30% higher - or 628 lbf ft. If the bolt is lubricated with SAE 30 oil - the torque compared to a dry bolt is reduced with approximately 40%. Note that if torque specified for a dry or slightly oiled bolt torque is applied to a lubricated bolt - the bolt may overload and break.
What is lubricated torque?
Values: Most torque values are based on non-lubricated fasteners. • Definitions: Lubricated means coated with a lubricant such as engine oil, thread sealant or threadlocker. • It is necessary to determine Torque coefficient (or Nut Factor) independently, for all critical applications.
What is K factor in bolt torque?
K Factor (Basic) The K factor is used to account for the energy lost to friction and other factors during the tightening process. The generally accepted K factors for this calculation are: 0.20 for assemblies with dry threads (no lubrication) 0.15 for assemblies with lubricated threads.
Should you Lube bolts before torquing?
Lubricants ease the amount of torque required to get the bolt properly tight, so you use your energy more efficiently.
What is a running torque?
Running torque is the determination of how much torque is required to keep the part rotating at a constant angular velocity once it starts rotating.
Why do we use torque to bolt?
Torque is used to create tension. Bolts are used to affix two components so that they can resist tensile (pulling apart) and shearing (sliding apart) forces. After the nut has been turned onto the bolt, additional torque causes the nut to turn and stretch the bolt.
How is bolt torque calculated?
The basic formula T = K x D x P stated earlier takes these factors into account and provides users with a starting point for establishing an initial target tightening torque.
How do we calculate torque?
Measure the distance, r , between the pivot point and the point the force is applied. Determine the angle θ between the direction of the applied force and the vector between the point the force is applied to the pivot point. Multiply r by F and sin θ and you will get the torque.
How are bolts calculated?
The tensile load a fastener can withstand is determined by the formula P = St x As. To find the tensile strength of a particular bolt, you will need to refer to Mechanical Properties of Externally Threaded Fasteners chart in the Fastenal Technical Reference Guide.
Can you torque the bolt instead of the nut?
In many situations you can apply torque to either the nut or the bolt head. Both will result in a tight connection and neither will avoid breakage more often (that occurrence can be avoided through other means). In certain circumstances, however, you will need to torque one and not the other.
What is the best thread lubricant?
FASTORQ's FastLUBE AG is one of the best thread lubricants on the market today....An Easy Preventative Against Catastrophic Bolt FailureControls Friction. Friction during torque can cause galling, seizing and fastener wear. ... Assists with Proper Tension. ... Reduces Corrosion. ... Aids Break-out. ... Reduces Damage.
Is anti-seize better than grease?
Because of its high solids content, anti-seize can handle high load applications while still providing lubrication and friction reduction....Anti-Seize.GreaseAnti-SeizeGood for fast-moving, low contact, low pressure applicationsGood for slow-moving, extremely high contact and high-pressure applications2 more rows•May 1, 2020
How do you lubricate a torque wrench?
The adjustable torque wrench does not need lubrication prior to each autoclaving. However, lubricating oil should be placed on the wrench head and around the blue dial edge periodically. For normal use, monthly should be sufficient. For heavy use, do more frequently.
How do you lubricate a bolt?
To reapply bolt lubricant, put it on the nut's threads and inside face. It's important that the lubricant is on the inside face of the nut, because much of the torque used to tighten the bolt is to get past the friction between the nut and washer or steel.
Should you lubricate bolt threads?
When tightening a fastener ALWAYS use a controlled method. Unless specifically told not to, always lubricate the fastener.
How do you know when you have properly lubricated a fastener?
When you apply lubricant, be certain that all valleys of the stud bolt threads are filled. Once the nut is hand tightened, you should see a bead of lubricant extruding from beneath the nut. This indicates that the lubrication has been applied to all working surfaces.
Wet Torque vs Dry Torque? Opinions please! - Jeep KJ and KK Liberty Forum
What is the general consensus on "Wet Torque vs Dry Torque?" Especially in regards to Lug nuts (or for some import vehicles bolts used to fasten a vehicles wheel to a hub.) In layman's terms, applying anti seize (copper slip, Molly slip, Teflon based grease, plain old grease or some form of...
Wet torque bolts vs dry torque with torque wrench
Hallo everyone, i m a 1991 Tengai 650 owner. I just did the doohickey upgrade with eagle mike lever and spring and put a new rotor bolt. Before tightening bolts with torque wrench i usually grease threads, and so i did with rotor bolt before finally tightening it as prescribed to 175 N-m.
Correct procedure for wet and dry torque specifications
Hello, This is my first post, and I hope I posted in the correct forum. My question pertains to the Automotive field. My understanding is that when torque is applied to a dry bolt, that the majority of the torque is applied to friction at the threads and the nut or bolt face areas.
Basics! Dry Torque versus Wet Torque | StromTrooper
Keep the Rubber Side Down. Jim Present Rides 1986 XR600R,1986 VF1000R,1999 CBR1100XX,2006 CRF450X,2007 DL1000 V-Strom
Torque specs-dry vs oil - Mechanical engineering general discussion ...
I have CAT-50 tool holders that have a 1 -8 thread pull stud with a 110 ft.lbs. max. torque spec. This seems quite sufficient if the threads were always dry. Ho
Reduced Torque with Lubricated Bolts - Engineering ToolBox
Example - Reduction of Torque when Bolt is Lubricated. The maximum tightening torque for a slightly lubricated 1" Grade 5 coarse bolt is 483 lb f ft.Dry bolt torque is approximately 30% higher - or 628 lb f ft.. T dry = (483 lb f ft) (1 + (30%) / (100%)) = 628 lb f ft If the bolt is lubricated with SAE 30 oil - the torque compared to a dry bolt is reduced with approximately 40%.
What is the general consensus on "Wet Torque vs Dry Torque"?
What is the general consensus on "Wet Torque vs Dry Torque?"#N#Especially in regards to Lug nuts (or for some import vehicles bolts used to fasten a vehicles wheel to a hub.)#N#In layman's terms, applying anti seize (copper slip, Molly slip, Teflon based grease, plain old grease or some form of oil) to the threads of the wheel studs/lug nuts/ bolts then torquing the lug nut/bolt to the manufactures recommended specification.#N# This will of course include doing the same for engine assembly.#N#The stretching of threads with cut threads opposed to rolled (ARP products for example) threads and so forth.#N#I was taught to always apply Copper slip (or a similar product) to either the lug nuts or wheel studs and on the back of a wheel so that the wheel and hub do not fuse together due to corrosion making removal easier.#N#After wrenching for 30 years, am I misinformed and doing it wrong?#N#I have never had a wheel come off from using lubricated threads or it's torque be affected.#N#What are your opinions on this?
What is bolt torque?
Bolt torque is a subject that is often misunderstood or overlooked on basic repairs. An average technician will remove and reinstall thousands of fasteners during their career. Loose or incorrectly, torqued fasteners are amongst the most common reasons for a shop “comeback”.
How much torque does it take to put a lug nut on a dirty stud?
Torque is torque and socks knows that. If you try to put a lug nut on a dirty stud it will take torque just to put the lug on so youre not getting a true 100ft lbs of torque to hold the wheel on. Sure it took 100ft lbs to get it tight but thats useless if it took a 1/4 of the torque just to get it on.
Is torque applied pressure?
Torque is applied pressure regardless! Wet relates to ease of removal as you stated.
Is there a difference between a dirty stud and a lubricated stud?
Actually there is a vast difference,been dealing with it longer then you been alive.A dirty stud or a lubricated clean stud will still have the same torque if torqued to 100lbs-ft with the same calibrated torque wrench,the damage to the nut/bolt will be different between the 2 though but the torque will be the exact same no matter what.
What torque is needed for 6mm bolts?
The standard torque for 6mm bolts is 7lb-ft. I don't like the spec for 8 in the manual.
What is the torque of a fuel pump?
Interestingly, it should be noted that on page 5-13, the Service Manual states a torque value of 7.3lb-ft to install the fuel pump. In the supplemental pages, (13-49), the torque value is stated as 7.0lb-ft.
Can you use a torque wrench to tighten threads?
If it appears that your threads are ok I would put down the torque wrench and just use feel to tighten them. If you feel you need to use a torque wrench get an inch pounds wrench. I would then use anti seize and put it together with the reduced torque.
Has the threaded section for the rotor bolt changed?
The threaded section for the rotor bolt, though, has never changed."
Does torque specify dry installation?
The torque value for that bolt does specify a dry installation, but the torque spec has varied quite a bit. The following is some stuff I have written in the past on the topic and I have simply cut and pasted it here. This is simply background information.
Lubrication effect on bolt tension and torque
When a bolt is lubricated - less torque is required to achieve bolt axial load or tension. Reduction of torques for lubricated vs. dry bolts are indicated in the table below.
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Citation
Engineering ToolBox, (2010). Reduced Torque with Lubricated Bolts. [online] Available at: https://www.engineeringtoolbox.com/torque-lubrication-effects-d_1693.html [Accessed Day Mo. Year].
What end should I use for thread lubricant?
I usually aim for the low end when using thread lubricant.
Why is an angle required for a fastener?
Angle is also required if the fastener is to be tensioned significantly past the yield point. The slope of the stress/strain curve reduces as tightening proceeds - the limiting case being a fastener tensioned to the UTS. This is impossible using a torque (stress) reading but can be approached using an angle (strain) reading.
Why do new fasteners need to be tightened?
All new fasteners need to be tightened a couple of times to burnish the threads and eliminate variability.
Will Eng tips check this out?
The Eng-Tips staff will check this out and take appropriate action.
Is it important to know the boundary conditions that are assumed for specified torque values?
Well, it's kind of important to know the boundary conditions that are assumed for specified torque values. I'm surprised that the manuals you are referring to don't make the boundary conditions clear.
