This Timken innovation prolongs shaft life while allowing easy installation and removal of a standard setscrew unit. Its patent-pending technology minimizes shaft damage by protecting shafts from gouging, raised metal and fretting corrosion. For more information about Timken shaft guarding technology, visit https://bit.ly/hFA355
The US is one of the only countries using the Imperial SAE sizing system for nuts, bolts, screws, washers, etc. The rest of the world uses the metric system. Metric sizes should be abundant and CHEAP! I found otherwise looking for exact types & sizes for an import auto restoration project. I also learned the hard way about hardness grading.