SS Fasteners and Galling !!

You're NUTs. Brass will have stripped long before the SS anchors even think of taking the down load.

You might try Gall-Tough.

Silicon bronze (or aluminum bronze) nuts are also sometimes used to prevent galling with stainless. Is there some reason why you can not use anti-seize compound?

Never-Seize and Fel-Pro both make anti-sieze compounds specifically for the use with stainless steel. There are several other manufacturers out there that make this type of product.

Stick to the stainless nuts! The use of brass nuts, besides brass being much softer, will still be a problem since the brass will eventually form an oxide in all but ideal conditions.

Old Salt

QUICK FIX: ANTI-SIEZE COMPOUND.

Do it!

It is generally accepted that if you ensure there is a difference in hardness between the two components, galling will not occur.

A few things to think about.

Do you need stainless. A lot of anchor bolts into concrete are carbon steel. Leave the part in the concrete to rust a bit to improve its keying-in properties.

If stainless is used, I have used 410 nuts with 316 bolts (for high temp applications) and this works.

Some people use higher strength nuts (increased hardness is usually accompanied by increased strength)

The other method we used - clumsy but practical - was to use a nut splitter or grinder to remove the nuts at a service and relace the nuts (and the bolts if necessary). This is only good if you have access to the bolt.

In a previous job I had in the nuclear industry, this was a common problem, particularly with remote handling equipment. At one time the solution was to use aluminium bronze but in later years Nitronic 60 (UNS S21800) was used as the nut (sometimes with a solid lubricant such as graphite or molybdenum disulphide).