It is the half of a sum. (0.5 is enough.)
It has something to do with carrying an illegal concealed firearm. Most concealed gun laws I've found have a -050 ending.
.050 inch.050 inch
.050 inch.050 inch
.050 inch.050 inch
.050 inch.050 inch
.050 inch.050 inch
it means stay fresh
.050 inch.050 inch
.125 is thicker than .050
.050 inch.050 inch
If you mean: 0.50 then they are 1/2, 2/4 and 3/6
A cross reference of a Kohler oil filter 52 050 02Read more: A_cross_reference_of_a_Kohler_oil_filter25-050-27