S-91255A082 2-64 x 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide finish, extending service life in demanding industrial environments
• Superior thread engagement with Class 3A fit precision, ensuring reliable fastening in critical applications
• High-torque installation capability through hex drive design, preventing stripping during assembly
• Optimized strength-to-weight ratio from alloy steel construction with 120,000 psi tensile strength
• Enhanced durability with Rockwell C39 hardness, maintaining performance under repeated stress
• Broad compatibility with UNF fine threading (2-64), ideal for precision equipment and machinery
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards

Professional Applications & Engineering Value

These Black-Oxide Alloy Steel rounded head screws with 2-64 UNF fine threading address critical challenges in precision assembly applications. The hex drive design provides secure tool engagement, eliminating cam-out issues during high-torque installations in confined spaces. The Class 3A thread fit ensures precise mating with corresponding components, preventing loosening in vibration-prone environments common to aerospace, electronics, and medical equipment. The combination of Rockwell C39 hardness and 120,000 psi tensile strength delivers reliable performance in high-stress applications while the Black-Oxide surface treatment provides essential corrosion protection for extended service life in industrial settings.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with UNF (Unified National Fine) thread form, these fully threaded screws maintain dimensional accuracy per ASME B18.3 and ASTM F835 specifications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety standards are met for global industrial applications.