On Tue, 20 Dec 2011 01:31:45 -0500, "Wild_Bill"
wrote:

Arbor nuts for securing grinding wheels aren't torqued like some fasteners
in other applications, but being able to attain a specific torque value is
easy with a fine thread, and mating contact areas are of benefit to holding
a position.
All bets are off when considering low-grade hardware.

A factor someone mentioned is the deeper the thread, the weaker the arbor
(or bolt/stud) for a given size.

With blotters on each side of a grinding wheel and the appropriate cupped
plates, (typical bench grinder) arbor nuts generally only need to be snug,
and a fine thread is beneficial for achieving snug.. not even close to a
grunt.

The blotters become slightly compressed, making good/excellent overall
contact between the abrasive and the plates.

OK. That makes sense. SOunds like it comes under the category of
"beneficial" but not "essential".

Michael Koblic,
Campbell River, BC