S-91255A060 5/8"-18 x 2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Superior torque transmission through 3/8" hex drive design, preventing stripping during high-tension applications
• Precision fine threading (UNF 5/8"-18) ensures secure fastening with Class 3A fit for vibration-resistant connections
• Maximum load-bearing capacity with 120,000 PSI tensile strength and Rockwell C37 hardness for heavy-duty applications
• Streamlined installation with fully threaded design and rounded button head for flush mounting and reduced snagging
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global industrial use
• Optimized head geometry with 1" diameter providing superior bearing surface for distributed clamping force

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide alloy steel screws solve critical fastening challenges in heavy machinery, automotive assemblies, and structural frameworks. The Class 3A UNF fine threads deliver superior resistance to vibrational loosening while maintaining precise alignment in high-stress joints. The rounded button head design eliminates sharp edges for safer handling and creates a clean, professional finish. With 120,000 PSI tensile strength and Rockwell C37 hardness, these fully threaded screws withstand extreme mechanical loads without deformation, making them ideal for critical connections where failure is not an option. The 3/8" hex drive ensures efficient installation with standard industrial tools, reducing assembly time while maintaining torque integrity.

Specification Summary & Compliance

Manufactured to precision Class 3A thread standards with UNF 5/8"-18 fine threading and right-hand direction. Complies with ASME B18.3 dimensional specifications and ASTM F835 material standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features include 2" length, 0.625" thread diameter, and fully threaded construction for consistent performance across industrial applications.