S-91772A512 3-56 x 3/16" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• High tensile strength of 70,000 psi ensures reliable performance under demanding mechanical loads
• Fine UNF thread with Class 2A fit provides precise, secure fastening in applications requiring tight tolerances
• Fully threaded design offers maximum grip and uniform stress distribution along the entire length
• Phillips No. 1 drive enables efficient installation with standard tools while minimizing cam-out risk
• Rounded pan head profile combines low-profile appearance with excellent bearing surface for secure clamping
• Comprehensive regulatory compliance meets ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

These 3-56 UNF rounded head screws deliver exceptional engineering value in precision assembly applications where corrosion resistance and mechanical reliability are critical. The passivated 18-8 stainless steel construction provides superior protection against oxidation and chemical exposure, making them ideal for electronics enclosures, instrumentation, medical devices, and marine equipment. The fine thread spacing and Class 2A thread fit ensure vibration-resistant fastening in thin materials and delicate components, while the Phillips drive facilitates rapid assembly without specialized tools. The combination of 70,000 psi tensile strength and full threading distribution prevents joint failure in high-stress applications, offering engineers a dependable fastening solution that maintains integrity across thermal cycles and mechanical shocks.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNF fine thread specifications (3-56 size). These screws comply with ASME B18.6.3 mechanical and dimensional requirements, ensuring interchangeability and performance consistency. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for global market acceptance. The right-hand thread direction and fully threaded configuration provide standardized installation across industrial applications.