There was a good video about torque specs on the youtube channel below...
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'Bout the only thing that really surprised me was the correction factor for anti-seize.
They're showing that the applied force is almost exactly double what the tool is adjusted for. I've always dialed-down my torque adjustment by 20%, and--apparently--I should have been using 50%.
I'm thinking that a couple of years ago when I last checked, the Permatex (or was it Loctite?) web site had torque correction factors for their various formulas of anti-seize, and they were along the lines of 10%--25% depending on the anti-seize formula. (Copper vs. Aluminum vs. Nickel)
Researching it right now, the "Permatex Training" web site says (lawyer talk, lawyer talk, disclaimers, disclaimers...) 20--30% reduction in torque-wrench setting.
Lubricants What Are Anti-Seize Lubricants? Overview What are Anti-Seize Lubricants? Anti-Seize Lubricants are heavy duty, high temperature lubricants that prevent seizing, galling, and corrosion of threaded fasteners during assembly, while assuring easy disassembly. They can be considered...
permatextraining.com
But the actual product fact-sheets call for "normal torque values" when assembling, which is JUST CRAZY. I think that part was written by lawyers who are too scared to change torque settings from what the manufacturer of the assembly is calling for.
Permatex aluminum-based anti-seize:
www.permatex.com/wp-content/uploads/tds/80078.pdf
Permatex copper-based anti-seize:
www.permatex.com/wp-content/uploads/tds/09128.pdf
Loctite is much the same. They tell you to "tighten with hand tools to proper torque requirement." in the C5A (copper) anti-seize web page.
www.henkel-adhesives.com/us/en/product/anti-seize-lubricants/loctite_lb_8008_c5-a/_jcr_content.html
LOCTITE LB 8008 C5-A is an exclusive anti-seize lubricant in a brush top form with copper and graphite suspended in high quality grease. It has an NLGI Grade of 0.
www.henkel-adhesives.com
OTOH, they give you a torque coefficient for their marine-grade anti-seize, and the math formula for figuring out the torque adjustment:
The relationship between torque and
clamp load is expressed in the following equation:
T = K x F x D
T = Torque (N·m, lb.in, lb.ft)
K = Torque coefficient or nut factor, determine experimentally
F = Clamp load (N, lb.)
D = Nominal diameter of bolt (mm, in.)
Torque coefficient, k:
3/8 x 16 steel nuts and bolts 0.18
But they're not so helpful with their other grades of anti-seize; either providing different torque coefficients, or saying nothing at all about torque.
SO: You can't trust the anti-seize manufacturer to provide much help in the torque-adjustment field; and since a 20% adjustment has been working for me fairly well for thirty years, that's what I'm going with.
