ASME B18.3 Socket Set Screws
Imperial Thread Size: 0# - 2"
Various Drive and Point Types
Various Surface Finishes
Other Material Grades are available
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This is a must see. Within the first 15 seconds you will see a bolt of lighting hit just beyond where I was filming towards the upper right hand of the screen. Now before you all start with the comments, I was in my truck (an UNGROUNDED object) and the window was just down far enough for the camera to capture. The train was CSX Q410-06 and this was filmed at the Annapolis Junction during a severe thunderstorm and a flash flood warning.
This video describes some of the rules of washers and also some variations.