S-91772A906 3-56 x 1" 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, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding industrial applications
• Precise thread engagement through Class 2A thread fit and UNF fine threading, providing secure fastening with minimal vibration loosening
• Optimized drive performance with Phillips No. 1 drive style, enabling efficient installation with standard tools
• Full-threaded design along the entire 1" length, maximizing grip strength and load distribution
• Comprehensive compliance with ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Versatile pan head profile with rounded design, offering excellent bearing surface while maintaining low-profile installation

Professional Applications & Engineering Value

Engineered for precision-critical assemblies, these 3-56 UNF fine thread machine screws deliver exceptional performance in industrial fastening applications where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides superior protection against oxidation and chemical exposure, making these pan head Phillips screws ideal for electronic enclosures, precision instruments, and machinery components. The Class 2A thread fit ensures consistent engagement in tapped holes, while the fully threaded design maximizes clamping force distribution. These rounded head screws with their standard pan head profile offer optimal bearing surface contact, preventing surface damage during installation and maintaining structural integrity under vibration and thermal cycling conditions common in manufacturing environments.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit precision and UNF fine threading (3-56 size). Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 1" length, 0.099" thread diameter, right-hand threading direction, and complete adherence to specified dimensional tolerances for reliable interchangeability in precision assemblies.