S-91773A551 1/4"-20 x 2 1/4" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for demanding applications
• Reliable thread engagement through Class 2A thread fit and UNC coarse threading for secure fastening
• Optimized drive performance with No. 3 Phillips drive providing efficient torque transfer and reduced cam-out risk
• Versatile partial threading design allowing for precise clamping force control in various material thicknesses
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance
• Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing applications

Professional Applications & Engineering Value

This 1/4"-20 UNC rounded head Phillips screw delivers exceptional engineering value in industrial settings where corrosion resistance and mechanical reliability are critical. The 18-8 stainless steel material combined with passivated finish provides superior protection against chemical exposure and atmospheric corrosion, making it ideal for marine equipment, food processing machinery, and outdoor structural applications. The partially threaded design ensures optimal clamping force distribution while the No. 3 Phillips drive offers efficient installation in confined spaces. With 100,000 psi tensile strength, this fastener maintains structural integrity under vibration and dynamic loads, solving common failure points in heavy-duty assembly operations across manufacturing, construction, and equipment maintenance sectors.

Specification Summary & Compliance

This industrial screw features precise Class 2A thread fit with 1/4"-20 UNC coarse threading and 2-1/4" length with partial threading. Manufactured to ASME B18.6.3 dimensional standards, it ensures interchangeability and proper function in mating components. The fastener is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, making it suitable for global supply chain requirements and environmentally conscious manufacturing operations.