S-91255A523 1/4"-20 x 7/16" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
• Superior thread engagement with Class 3A fit ensuring precise, vibration-resistant fastening in critical applications
• High-torque installation capability through hex drive design that prevents stripping and enables secure assembly
• Maximum load-bearing capacity with 120,000 PSI tensile strength and Rockwell C39 hardness for heavy-duty applications
• Optimized for quick installation with coarse UNC threads that reduce assembly time and prevent cross-threading
• Low-profile rounded head design that provides smooth surface finish while maintaining structural integrity
• Full regulatory compliance meeting international standards for safety and environmental requirements

Professional Applications & Engineering Value

These black-oxide alloy steel screws with 1/4"-20 UNC Class 3A threading deliver exceptional performance in demanding industrial settings. The combination of high tensile strength (120,000 PSI) and Rockwell C39 hardness ensures reliable fastening in vibration-prone equipment, machinery assemblies, and structural applications. The rounded head profile with hex drive design allows for flush mounting while providing superior torque transmission. The black-oxide surface treatment offers enhanced corrosion protection, making these fully threaded screws ideal for automotive, manufacturing, and heavy equipment applications where durability and precision are critical. The coarse thread spacing ensures quick installation and reduced assembly time in production environments.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread tolerances with UNC coarse thread form and right-hand threading. These screws conform to ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and mechanical performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications. The 7/16" length and fully threaded design provide consistent fastening performance across the entire shank length.