S-91772A554 1/4"-20 x 3" 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 drive engagement via Phillips No. 3 drive, ensuring efficient installation and reduced cam-out risks
• Enhanced thread reliability with UNC coarse threading and Class 2A fit, providing secure fastening in various materials
• Versatile partial threading design allowing precise clamping force control in assembly applications
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe, sustainable usage

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these rounded head screws deliver critical performance advantages through their passivated 18-8 stainless steel composition and UNC coarse thread design. The corrosion-resistant surface treatment prevents degradation in moist or chemical-exposed environments, while the 70,000 psi tensile strength ensures structural integrity under vibration and dynamic loads. The partially threaded configuration enables precise joint compression control in machinery assembly, electrical enclosures, and structural frameworks. With Phillips No. 3 drive compatibility, installation efficiency is maximized across production lines without specialized tools, making these pan head screws ideal for maintenance, manufacturing, and heavy equipment sectors requiring right-hand thread fasteners with predictable performance.

Specification Summary & Compliance

This 1/4-20 x 3" screw maintains precision Class 2A thread fit tolerances with UNC coarse thread spacing (20 TPI) and minimum 1-1/2" thread length. Manufacturing adheres to ASME B18.6.3 mechanical standards, while full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and material sustainability.