ASTM F593
ASTM F593. ASTM F593 covers the chemical and mechanical requirements for stainless steel bolts, hex cap screws, and studs in diameters ranging from 1/4″ to 1-1/2″ inclusive. These fasteners are for general purpose usage and are available in seven alloy groups. Below is a basic summary of the common grades within the ASTM F593 specification.