S-91255A120 5/8"-11 x 2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for prolonged service life in harsh industrial environments
• Superior load-bearing capability with 120,000 PSI tensile strength to withstand extreme mechanical stress
• Precise Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
• Optimized hex drive design (3/8") provides maximum torque transmission and prevents tool slippage
• Full threading along 2" length delivers uniform clamping force across the entire engagement area
• Enhanced material durability through Rockwell C37 hardness for repeated use without deformation
• Coarse UNC threading enables rapid installation and superior resistance to loosening under dynamic loads

Professional Applications & Engineering Value

These black-oxide alloy steel rounded head screws address critical challenges in heavy machinery, structural frameworks, and industrial equipment assembly. The 5/8"-11 UNC coarse thread configuration combined with Class 3A thread fit eliminates cross-threading risks while maintaining alignment precision in high-vibration environments. The fully threaded design distributes shear forces evenly, preventing stress concentration points that compromise joint integrity. Engineered with 120,000 PSI tensile strength, these hex drive screws provide reliable performance in load-bearing applications where fastener failure is not an option, from construction equipment to manufacturing automation systems.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F835 specifications with Class 3A thread tolerance for precision fit. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Features UNC coarse threading with 5/8"-11 thread size and 2" full-length threading for consistent performance across industrial applications.