S-91772A551 1/4"-20 x 2 1/4" 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
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
• Optimized assembly efficiency through Phillips No. 3 drive and pan head design for secure tool engagement
• Precision thread compatibility with UNC coarse 1/4"-20 threads and Class 2A fit ensuring consistent fastening
• Enhanced design flexibility with partial threading allowing unthreaded shank sections for specific mounting applications
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH
• Durable surface protection through passivation treatment providing extended service life in corrosive conditions

Professional Applications & Engineering Value

These passivated 18-8 stainless steel pan head screws deliver critical engineering value in demanding industrial applications where corrosion resistance and mechanical reliability are paramount. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures these 1/4-20 UNC coarse thread fasteners maintain structural integrity under vibration and load stress. The Phillips No. 3 drive system provides secure torque transmission while the partially threaded design allows for precise clamping in assemblies requiring both threaded and unthreaded sections. Particularly valuable in electrical enclosures, machinery frames, and outdoor equipment, these industrial fasteners solve common failure points by combining corrosion-resistant materials with standardized ASME B18.6.3 manufacturing precision.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerance for consistent engagement. Thread specifications include 1/4"-20 UNC coarse thread with partial threading extending to minimum 1½" length. Full compliance with ASME B18.6.3 manufacturing specifications ensures dimensional accuracy and performance reliability. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, confirming these fasteners meet current regulatory standards for industrial use.