S-91735A537 1/4"-20 x 1/2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh environments and chemical exposure
• Exceptional mechanical strength delivering 80,000 psi tensile strength and Rockwell B85 hardness for reliable load-bearing performance
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Optimized drive efficiency through Phillips No. 3 drive design preventing cam-out and enabling consistent torque application
• Full-threaded design maximizing grip length and distribution for enhanced holding power in various materials
• Rounded pan head profile providing a low-profile, finished appearance while accommodating standard driving tools
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel rounded head screws deliver exceptional performance where corrosion resistance and mechanical reliability are critical. The combination of passivated finish and marine-grade stainless steel provides superior protection against chemical exposure, saltwater environments, and industrial contaminants. The UNC coarse thread configuration ensures rapid installation and secure fastening in soft metals, plastics, and wood substrates, while the Phillips drive design offers familiar, efficient driving capability. These fully threaded 1/4"-20 screws maintain consistent clamping force in assembly applications ranging from marine equipment and food processing machinery to chemical plant installations and outdoor structures, where long-term durability and regulatory compliance are essential engineering requirements.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerance for precision assembly. Complies with ASME B18.6.3 mechanical and dimensional specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for hazardous substance restrictions. Thread configuration follows UNC 1/4"-20 coarse thread standards with full threading along the 1/2" length for maximum fastening versatility.