S-90910A686 2-56 x 3/8" ASME B18.3 Stainless Steel Button Head Torx Plus Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ideal for harsh industrial environments
• Enhanced torque transmission and tamper resistance through Torx Plus IP6/T6 drive system, reducing tool slippage and fastener damage
• High mechanical strength with 60,000 psi tensile strength and Rockwell B55 hardness for reliable performance under stress
• Secure and precise fastening with Class 2A thread fit and UNC coarse threading, ensuring consistent engagement and vibration resistance
• Streamlined installation with fully threaded 3/8" length and rounded button head design, providing flush mounting and reduced snagging
• Long-term reliability through compliance with ASME B18.3 manufacturing standards, guaranteeing dimensional accuracy and interchangeability
• Environmental and regulatory safety with RoHS 3 and REACH compliance, meeting global substance restriction requirements

Professional Applications & Engineering Value

These 2-56 UNC Rounded Head Torx Plus Screws deliver critical engineering solutions where corrosion resistance, high torque requirements, and space constraints intersect. The 18-8 Stainless Steel material with passivated finish provides exceptional protection against oxidation and chemical exposure in demanding environments like electronics enclosures, medical devices, and marine equipment. The Torx Plus IP6 drive eliminates cam-out issues common in Phillips drives, enabling higher torque application without damaging the fastener head—particularly valuable in automated assembly lines. The rounded button head profile offers a low-profile design that minimizes protrusion while the fully threaded coarse UNC pattern ensures rapid installation and superior holding power in thin materials. This combination directly addresses industrial pain points of fastener failure, maintenance frequency, and assembly efficiency.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (2-56 size, 0.086" diameter) and 3/8" fully threaded length. Complies with ASME B18.3 dimensional standards for consistent quality and interchangeability. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements for hazardous substance restrictions. Material certification includes Rockwell B55 hardness and 60,000 psi tensile strength verification.