S-91771A886 2-56 x 3/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ensuring longevity in harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under high-stress conditions
• Precision flush mounting enabled by the undercut flat head profile and 82° countersink angle for seamless surface integration
• Optimized drive engagement with Phillips No. 1 drive style providing secure torque transmission and reduced cam-out risk
• Consistent threading performance through fully threaded coarse UNC pattern with Class 2A fit for reliable assembly
• Broad industrial compatibility with right-hand thread direction meeting standard machinery requirements
• Regulatory peace of mind with full compliance to ASME B18.6.3, RoHS 3, and REACH standards

Professional Applications & Engineering Value

These 2-56 UNC flat head Phillips machine screws deliver critical engineering solutions for industrial applications requiring flush surface mounting and corrosion-resistant performance. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these fully threaded screws ideal for machinery, electronic enclosures, and precision equipment where surface integrity is paramount. The undercut flat head profile combined with the 82° countersink angle ensures perfect flush installation, eliminating protrusions that could interfere with moving components or compromise aesthetic requirements. With coarse UNC threading and Class 2A thread fit, these screws offer reliable engagement in both metallic and composite materials, reducing the risk of cross-threading during high-volume assembly operations.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC coarse thread specifications. These 3/4" machine screws comply with ASME B18.6.3 manufacturing standards and meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements for environmental compliance and substance restrictions.