Please consider a fastened joint in which Loctite 242 anaerobic threadlocker has been applied to the associated degreased steel screw upon assembly.
Numerous sources describe the lubricating quality Locite 242. I have Loctite-generated data tables with torque coefficients that reflect this as being the case for 242 applied to steel fasteners with a slightly oily film already on them (Kt=0.15); but per analogous tables for degreased steel fasteners with the 242 applied, the torque coefficient is the same as that of a dry steel fastener (Kt=0.20). Can this be true?
Wouldn't some Loctite 242 lubricating qualities prevail even on a degreased fastener, thus justifying the application of lubed (vs dry) torque values in applicable torque specs? Overtorquing with dry torque values could be very damaging from an tensile strength standpoint if the joint is lubricated, yet undertorquing with lubed values if not applicable might permit gapping.
Any input would be much appreciated. I realize that testing is the best answer to this question, but I'd like to learn from the experiences of others first.
Thanks. JW