[Jim Sims]

Sigh! 101 projects needs an erratum issued for this CV joint screw torque spec. For some years it is just plain wrong; my '76 has 8 mm screws and if they were torqued to 60 ft-lbs some would likely shear off! Screw/bolt strength is determined by cross-section area; area increases by the square of the diameter times the constant PI/4. Thread friction increases approximately linearly with diameter. And yes, the product of these two increases combine to just about double the required torque. 10 mm (across the shank or diameter of the bolt, not the wrenching feature size) screws of the 12.9 class used in CV joints require 60 ft-lbs (threads not oily or greasy) to properly tighten. Also gents, the length of a screw or bolt has essentially no bearing on required torque. The torque with very few exceptions will be the same for a 50 mm or 100 mm long screw or bolt of the same diameter and thread type. The longer screw or bolt may turn or "wind up"more but the torque setting on the torque wrench will be the same. Cheers, Jim