S-90585A124 2-56 x 1/2" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under heavy loads
• Precision Class 3A thread fit ensures secure, vibration-resistant fastening with minimal backlash in critical assemblies
• Optimized drive engagement through hex drive design provides superior torque transmission and reduces stripping risk
• Full threading capability allows complete engagement along the entire 1/2" length for maximum holding power
• Industry-standard compliance with ASME B18.3 specifications guarantees dimensional accuracy and interchangeability
• Environmental regulation adherence through RoHS 3 and REACH compliance for global market acceptance

Professional Applications & Engineering Value

These 2-56 UNC flat head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The 316 stainless steel composition, enhanced by passivated finish, provides exceptional protection against chemical exposure and atmospheric corrosion, making these fasteners ideal for marine, chemical processing, and food industry applications. The coarse UNC thread profile with Class 3A fit ensures rapid installation and secure fastening in materials where fine threads might strip or fail. The hex drive configuration offers superior torque transmission compared to slotted alternatives, reducing installation time and preventing driver slippage that can damage fastener heads. The fully threaded design maximizes engagement in thin materials and allows for adjustable positioning in assembly applications.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit tolerance for superior engagement and UNC coarse thread spacing (2-56) for rapid installation. These flat head screws feature standard 82° countersink angle and comply with ASME B18.3 specifications for dimensional accuracy. Regulatory compliance includes RoHS 3 (2015/863/EU) for restricted substance management and REACH (EC 1907/2006) for chemical safety, ensuring global market acceptance and environmental responsibility.