S-91772A945 1/4"-28 x 1 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 environments and extended service life
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high stress
• Precision fastening ensured by Class 2A thread fit and UNF fine threading, providing secure connections with reduced risk of stripping
• Optimized drive engagement with No. 3 Phillips drive style, allowing efficient installation and reduced cam-out during assembly
• Full-threaded design for maximum grip length and uniform load distribution across the entire fastener
• Compliance with major standards including ASME B18.6.3 for dimensional accuracy and RoHS 3/REACH for environmental safety
• Versatile pan head profile with standard rounded design for flush or slightly protruding applications in various assemblies

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these passivated 18-8 stainless steel pan head screws deliver exceptional corrosion resistance where moisture, chemicals, or outdoor exposure are concerns. The UNF fine threading with Class 2A fit ensures precise engagement in tapped holes, minimizing cross-threading risks in high-vibration applications like machinery, automotive assemblies, and electronic enclosures. The combination of 70,000 psi tensile strength and Rockwell B70 hardness provides reliable clamping force without deformation, making these fully threaded screws ideal for structural components requiring consistent load distribution. The No. 3 Phillips drive offers familiar, efficient installation while the rounded pan head design accommodates standard countersunk or flat surface mounting.

Specification Summary & Compliance

This fastener meets ASME B18.6.3 dimensional specifications with 1/4"-28 UNF fine threads in Class 2A tolerance for consistent fit. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance-free components. Threading is fully formed along the 1 3/4" length with precise 0.25" diameter and standardized pan head geometry (0.492" diameter, 0.175" height) for interchangeability.