S-91772A635 5/16"-18 x 2 3/4" 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
• Enhanced assembly efficiency through coarse UNC threading and Class 2A fit, reducing cross-threading risks
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
• Optimized partial threading provides secure fastening while minimizing material usage and weight
• Comfortable installation with No. 4 Phillips drive and rounded pan head design reducing cam-out
• Long-term durability backed by Rockwell B70 hardness for consistent performance in repetitive applications
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards

Professional Applications & Engineering Value

These 5/16"-18 UNC partially threaded screws deliver exceptional engineering value in demanding applications where corrosion resistance and mechanical strength are critical. The passivated 18-8 stainless steel construction provides superior protection against oxidation and chemical exposure, making them ideal for marine equipment, food processing machinery, and outdoor structures. The coarse thread spacing combined with Class 2A thread fit ensures rapid installation and secure fastening in various materials, reducing assembly time while maintaining joint integrity. The rounded pan head with Phillips drive offers excellent torque transmission and flush mounting capabilities, while the partial threading design prevents unnecessary thread engagement, minimizing stress concentration points. These industrial fasteners are engineered to withstand vibration, thermal cycling, and mechanical stress while maintaining their 70,000 psi tensile strength throughout their service life.

Specification Summary & Compliance

This screw features precision 5/16"-18 UNC coarse threads with Class 2A thread fit tolerance for consistent engagement. Manufacturing complies with ASME B18.6.3 specifications ensuring dimensional accuracy and performance reliability. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental and safety standards. Threading is partially applied with minimum 1½" thread length on a 2¾" overall length, providing optimal fastening performance while maintaining structural efficiency.