S-91735A544 1/4"-20 x 1 1/4" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 316 stainless steel construction with passivated finish, ideal for harsh chemical and marine environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable performance under heavy loads
• Precision thread engagement with Class 2A thread fit and UNC coarse threading ensures secure fastening and vibration resistance
• Optimized drive efficiency with Phillips No. 3 drive style and pan head design for easy installation and reduced cam-out
• Full-threaded construction provides maximum grip length and uniform stress distribution across the entire fastener
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance reliability
• Environmental responsibility with RoHS 3 and REACH compliance, ensuring safe use in regulated applications

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 1/4"-20 UNC Phillips pan head screws deliver exceptional value in applications where corrosion resistance and mechanical reliability are paramount. The 316 stainless steel composition provides superior protection against chloride-induced stress corrosion cracking, making these fasteners ideal for chemical processing equipment, marine hardware, and food processing machinery. The passivated finish enhances surface durability while maintaining the material's inherent corrosion-resistant properties. With fully threaded construction and coarse UNC threading, these screws offer rapid installation and superior holding power in both metallic and non-metallic materials. The combination of 80,000 psi tensile strength and Rockwell B85 hardness ensures these fasteners maintain integrity under vibration and thermal cycling, reducing maintenance frequency and downtime in critical assemblies.

Specification Summary & Compliance

These rounded head screws feature precise Class 2A thread fit tolerances and conform to UNC thread standards with 1/4"-20 coarse threading. Manufacturing follows ASME B18.6.3 specifications for dimensional accuracy and performance. The products are fully compliant with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) requirements, ensuring environmental safety and regulatory adherence for global industrial applications.