Fractional Size 18-8 SS Fasteners
Stainless Steel Hex Head Cap Screws – ASTM F593 (18-8)
ASTM F593 stainless steel hex head cap screws manufactured from 18-8 stainless steel offer an excellent balance of strength, corrosion resistance, and reliability for a wide range of industrial and commercial applications. Designed for fractional sizing and U.S. standard compatibility, these fasteners are widely specified in construction, manufacturing, automotive, and general maintenance environments where durability and corrosion protection are essential.
ASTM F593 Mechanical Properties and Conditions
ASTM F593 covers stainless steel bolts, screws, and studs intended for general-purpose applications. For sizes 1/4" through 5/8", fasteners are produced in Condition CW1, featuring a tensile strength range of 100,000 to 150,000 psi, a yield strength of 65,000 psi, and a Rockwell hardness of B95 to C32. These fasteners are identified by the F593C head marking.
For sizes 3/4" through 1-1/2", fasteners are manufactured in Condition CW2, offering a tensile strength range of 85,000 to 140,000 psi, a yield strength of 45,000 psi, and a Rockwell hardness of B80 to C32. These larger sizes are marked F593D, ensuring easy field identification and compliance verification.
Corrosion Resistance and Material Benefits
18-8 stainless steel contains approximately 18% chromium and 8% nickel, providing excellent resistance to rust, oxidation, moisture, and mild chemical exposure. This makes ASTM F593 hex head cap screws suitable for both indoor and outdoor applications, including environments exposed to humidity, water, or atmospheric conditions.
Design, Sizing, and Applications
The hexagonal head design allows for secure wrenching and efficient torque application using standard tools. Fractional sizing ensures compatibility with standard U.S. nuts and washers, simplifying installation and replacement. These fasteners are commonly used in machinery assembly, structural connections, metal fabrication, and general-purpose construction and repair work.
Key Advantages of ASTM F593 18-8 Hex Head Cap Screws
Excellent corrosion resistance in most environments
Strong mechanical properties across multiple size ranges
Fractional sizing for U.S. standard applications
Clear head markings for easy grade identification
Reliable performance for industrial and general-purpose use
For dependable fastening with proven corrosion resistance and strength, ASTM F593 18-8 stainless steel hex head cap screws deliver consistent performance professionals trust.