Stainless Steel Fasteners A2 grade - also known as Type 304 has good resistance to corrosion, except in severe industrial and Marine Conditions. It is often used inside Marine vessels where it doesn't come into direct contact with seawater. Other applications: UPVC Cladding, Garden tools, Roofs, Outside fixings, Motor Cycles, Caravans, Lawn Mowers, Radio Control models, kitchens, bathroom's, etc
A4 grade stainless steel is also known as type 316. This has a greater corrosion resistance than A2 in certain environments, and is often used for Marine applications especially when coming into direct contact with salt water.