radius dimensions on structural angle stock

It is not that simple:

Excerpt from ASTM A6/6M

12.3.1 Annex A2 lists the designations and dimensions, in
both inch-pound and SI units, of shapes that are most commonly
available. Radii of fillets and toes of shape profiles vary
with individual manufacturers and therefore are not specified.

Excerpt taken from AISC Manual of Steel Construction

In calculating the theoretical weights, properties, and dimensions of the rolled shapes
listed in Part 1 of this Manual, fillets and roundings have been included for all shapes
except angles. Because of differences in fillet radii among producers, actual properties of rolled shapes may vary slightly from those tabulated. Dimensions for detailing are generally based on the largest theoretical-size fillets produced.

Equal leg and unequal leg angle (L) shapes of the same nominal size available from
different producers have profiles which are essentially the same, except for the size of fillet between the legs and the shape of the ends of the legs. The k distance given in the tables for each angle is based on the theoretical largest size fillet available. Availability of certain angles is subject to rolling accumulation and geographical location, and should be checked with material suppliers.

If you give a more specific shape(s) I can give you the maximum 'k' distance as per this manual.

If you need to be more accurate you will need to check with your supplier.

Typicaly the radius on the toe is 1/2 the thickness and the radius between the legs is 1 material thickness.

So, if it's an L2x2x1/4 the toe radius is 1/8" and the crotch radius is 1/4". It may vary a bit from one mill to the other but that has served me well over the years.

Travis