01vetter

Do you reduce your torque numbers when using anti seize? I have a chart for lubed and non-lubed torques. Lubed is roughly 3/4 of non lubed.

Opinions please.

cabech984

An anti seize such as permatex brand recommends factory torque specs, some brands and types recommend reduced torque values. I'd do a google search of what you plan to use.

Paul 75 L82

I have always used the listed torque and I lube every thread.

leadfoot4

01vetter

I realize that Permatex recommends factory torque, but I checked their Material Data Sheet and it is 80-90% oil! That sure sounds like a lubricant! In fact, they call their anti-seize a lubricant!'

01vetter

I used anti seize on my intake manifold bolts with stock torque recommendations. I just removed the intake manifold again and found some aluminum flakes on the bolt threads when I inspected them . The only thing that I can attribute this to is perhaps the torque was to high due to the bolts being lubed. Maybe I should have reduced the torque by about 20 to 25%.

vettenuts

Yes, torque is reduced if the specified torque is for an un-lubricated connection.

Torque is used as a very inaccurate measure of the bolt stretch. The actual stretch can vary by a large amount depending on the friction. Lubrication is a way to obtain more consistent stretch, but the torque value for a given stretch is reduced from un-lubricated as a result. 3/4 is the textbook "simplified" value and is likely well within the measuring accuracy of a normal torque wrench.

pickleseimer

Some lubes will specify the use of a different torque, such as ARP thread sealants and such. Last time I used that stuff on head bolts for a Gen 1 SBC the torque was reduced by 10 lb/ft over other lubes and dry threads. Best to check the product recommendations.

dadaroo

Having fastener design experience in the nuclear industry, if the original torque was for dry (unlubricated) threads I would reduce the torque by 20%.

There is a lot of industry experience on this which shows a need to reduce torque by 25%on average. I would rather be over on the torque about 5% than below. A little over by that amount should be well within the fastener strength capability.

Cybermind

Unless otherwise stated, all torque specifications are in the dry condition. Torque values are raised or lowered based on the amount of friction present betweent the two surfaces. Lubricants completely change those torque specs and that is why a rule of thumb is to never apply any sort of lubricant to wheel lugs, for example. As others have stated, if lubricants are used, then revised torque specifications need to be calculated or obtained.

01vetter

Read this thread, all two pages. Page 2 has some interesting comments from a Loctite employee.

http://forum.ih8mud.com/80-series-te...ing-bolts.html

01vetter

I called Permatex and asked about torque values. Their Tech Data Sheet says to use factory torque values. Their tech department didn't have any idea if this is correct. I doubt that it is because it is a lubricant. They supposedly are checking their recommendation and will contact me. Will let everyone know IF I hear from them.