Not necessarily. Both A4/316 and A2/304 are primarily indicators of the chemical composition of these Austenitic (not heat treatable) fasteners. They get their ultimate mechanical strength from the cold working and forming process. That’s why stainless fasteners have additional markings such as 50, 70, and 80 to indicate their mechanical strength as well as their chemical properties. A2 may be magnetic and is corrosion resistant; A4 must not be magnetic and has the addition of being acid resistant. As standard practice stainless parts are passivated to help remove surface contamination that may have been acquired during the manufacturing process. If you require passivation to a specific standard please let that be know when inquiring. See our catalog pages 10-1023 and 10-1024 in Section 10 for more details.