Torque values and anti-corrosion compounds...

[Gerard]

Hi!

I was bored a week or so ago and grabbed a booked called "Automotive
Technology: A systems approach" by Jack Erjavec and Robert Scharff. I
took a look at the section on fasteners and the like. It says something
along the lines of when using things such as copper compound on alloy
steel bolts you can reduce the applied torque by about 45% as when
torquing up the bolt when it is dry. What's the deal here? One paragraph
goes:

  Nonplated bolts have a rougher surface than plated finishes.
  Therefore, it takes more torque to produce the same clamping
  force as on a plated bolt, even with one-third less friction.
  Add a lubricant and the torque might be as much as two-thirds
  lower.

Never realised this. Seems odd. What does this mean then when one
intends to use copper compound anti-seize on a bunch of nuts and bolts?

G.
-- 
gerard at poboxes.com
q-list info: 1989/90 200 (mac13a MC-1)