Many professional, industrial, and mechanics tool brands engineer their premium combination and open-end wrenches with anti-slip features.
Anti-slip wrenches are engineered with grooves or serrations on one or both flats of their open-end sides.
Snap-on’s Flank Drive Plus, Proto’s Anti-Slip Design (ASD), Matco’s Opti-Torque Pro, Mac Tools’ Knuckle Saver, and Wright’s WrightGrip wrench designs all feature anti-slipping elements.
Although different in style, all of these and other brands’ anti-slip open end wrenches are designed to reduce slipping and impede fastener corner rounding damage.
Do they work? Yes, wrenches with anti-slip designs are typically more effective in higher torque applications than those without such features.
Garage Journal member woodstockva with YouTube handle dmcguinn1 put together a video demonstrating the benefits of Wright WrightGrip wrenches compared to those that do not feature anti-slip grooves or serrations.
While the video is intended to highlight Wright’s WrightGrip wrenches, I feel it also does a great job at demonstrating the benefit of anti-slip open ended wrench designs in general.
Spoiler Alert: the WrightGrip wrench does not slip off the fastener and instead maintains contact with the bolt until excessively high torque shears the bolt head right off.
If your wrenches don’t feature anti-slip open ends, there’s no need to rush out to replace them with all new wrenches. But if you have a tendency to round off your fasteners or are upgrading to a new set of wrenches anyways, the above video might help you determine whether you need wrenches with such features.