Loctite and anti seize are said to have 0 coefficient of friction reduction according to Henkle. I only lube threads when instructed to do so because the reduction of coefficient of friction is factored into the torque spec specified by the engineers. IMO only fasteners that that are specifically called on to be lubed should be lubed. Too much torque applied to a fastener because it is lubed instead of installed dry and you torque the bolt past its yield point and once again loose clamping force.
DaveJ Well-Known Member. The torque value is dependent on the friction produced in the threads and under the torqued bolt head or nut and the fastened material or washer if used. This friction can be affected by the application of a lubricant or any plating e. Asking a question like that is insulting, therefore I won't engage in any further conversation with you on this. Name Roger.
If you dig deep enough every bolt manufacturer will have a chart of dry vs lubed TQ specs. Some will even note about TQ variances of new vs old due to stretching. Andrew definitely contains nuts.
Name Andrew. Andrew said:. Hi Andy, This is quite a contentious topic and with good reason. Do you have a link to those other publications so we could all take a look? Tinman Well-Known Member. Repair manuals are pretty good about noting thread lock for certain nuts and bolts, but not always about which fasteners to lube. I had always assumed that using anti seize and torque to spec was a safer way to go than to torque any bolt dry, especially when light torque values are required.
Is that wrong? Curt Certifiable. Name Curt. An oil drain bolt will never have dry threads. The point is that not all bolt applications can be covered by blanket statements.
The Permatex datasheet classifies it as a "grease" but recommends using dry torque values. It could be that it contains enough aluminum, copper and carbon particulates to change the friction characteristics. In a questionable case like this I'd set the torque wrench to dry spec, but hold it close to the socket and stop early if the "elbow gauge" detects trouble coming.
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You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Anti-seize and over torquing bolts. CruiseOrlando Conveniently Enhanced. Interesting article on Rock Auto's "My Garage" section of their newsletter concerning the use of anti-seize and torque settings. It never occurred to me that you should adjust the torque you apply if you use anti-seize on bolts.
After struggling to remove a frozen fastener, I want to make sure that it is easier to remove the next time. I have read that the problem with smearing anti-seize compound on nuts and bolts is that it makes it too easy to over-tighten even using a torque wrench. Cylinder head bolts sometimes have a torque specification that requires both a torque wrench and a torque angle meter to measure a subsequent rotation of the fastener by a set number of degrees.
I decided to clear off a corner of my workbench for a quasi-scientific investigation! Then I put anti-seize compound on the bolt and measured the torque necessary to bring the bolt head back to the dry positions.
For example, 45 ft. The bolt head turned far past remember this is quasi-scientific! This is well known by engine rebuilders. That's why internal engine fasteners are only lubed with engine oil. And why diff side bearing preload ring threads are best lubed with anti-seize. A bolted joint, which experiences a high temperature environment and requires future maintenance, is your typical application for an anti-seize.
They can also be used to improve gasket performance, provide a more consistent clamp load, prevent galling, improve electrical conductivity, and protect against harsh corrosive environments. These compositions are often tailored to a specific need, so the question you may ask is — which one is best for your application? Anti-seize formulations consist of two stages of lubrication.
High quality grease serves as a base lubricant up to degrees F, and lubricating solids suspended in the grease serve up to 2, degrees F. When the temperatures of the joint exceed degrees F, the grease dissipates and the remaining lubricating solids, which have now softened, plate the surfaces. It should be noted that due to the solids, anti-seize products are not used to lubricate dynamic loads.
An exception to this rule is made for those formulas containing molybdenum disulphide, which can be used as an aid in the assembly of press fits or on splines and gears subjected to high static or slow moving loads. Anti-seize lubricants highly filled with molybdenum disulphide provide the best lubrication. Copper and aluminum are the most common and traditional lubricating solids in anti-seize.
Copper based formulas are limited to 1, degrees F and aluminum based formulas to 1, degrees F — and should serve well in most applications. The oil and gas industry demands greater chemical resistance in applications where acids, chemical corrosion, and oxidation are present. Some of the processes in a refinery cannot tolerate copper because it can poison a catalyst bed or reaction chamber. Nickel based anti-seizes are used to fill these needs.
In addition to their superior chemical resistance, they also have increased temperature limits up to 2, degrees F. Graphite is an excellent conductor of electricity and high temperature solid lubricant up to degrees F. It is therefore widely used in formulations of anti-seize. In assemblies with electrical current running through a fastened joint such as the threads of spark plugs, ground screws, and antennae connections, anti-seize can be used with minimal increase to resistance.
Corrosion of a threaded joint increases the electrical resistance. The use of anti-seize on these types of connections will ensure current is transmitted reliably by preventing corrosion. Aluminum is a soft metal and therefore sensitive to galling and stripping of your threads. A softer or non-abrasive solid lubricant is required in these situations.
A zinc dust filled anti-seize is your top choice but several metal-free products also offer adequate performance. Metal-free formulations are increasingly utilized and have performance meeting or exceeding traditional soft metal based formulas.
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