The standard for dimensioning is that the dimension and the tolerance on that dimension must contain the same number of decimal places. So the issue of trailing zeros, is a not a concern as long as the number of decimal places for the dimension and tolerance are the same. Example: 2.35+/-.010 is...
The internal tooth lockwasher is for use under screw heads since the intent of the teeth is to grip the thread on the screw or bolt. The external tooth lockwasher is for use under a nut since the teeth cannot grip the treads on the nut, they are intended to grip the surface of the nut to keep it...
