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Subject:
Penetrating Oil
"Machinist's
Workshop" recently published information on various
penetrating oils. The magazine reports they tested
these products for "break out torque" on rusted nuts
and bolts. A subjective test was made of popular
penetrating oils, with the unit of measurement being
the torque required to remove the nut from a
"scientifically rusted" bolt.
Average
torque load to loosen nut:
No Oil
used .........................516 foot pounds
WD-40
...............................238 foot pounds
PB
Blaster ..........................214 foot pounds
Liquid
Wrench .......................127 foot pounds
Kano
Kroil ..........................106 foot pounds
*ATF/Acetone
mix .....................53 foot pounds*
*The
ATF/Acetone mix is a "home brew" mix of 50/50
automatic transmission fluid and acetone.
Note
this "home brew" released bolts better than any
commercial product in this one particular test. Our
local machinist group mixed up a batch, and we all now
use it with equally good results. Note also that
Liquid Wrench is almost as good as Kroil for about 20%
of the price.
ATF/Acetone
mix is best, but you can also use ATF and lacquer
thinner in a 50/50 mix.
ATF =
Automatic Transmission Fluid