S-91735A617 1/4"-28 x 1 1/2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh marine and chemical environments
• Exceptional mechanical strength offering 80,000 psi tensile strength and Rockwell B85 hardness for reliable load-bearing performance
• Precision fine threading with Class 2A fit ensures secure fastening and vibration resistance in critical assemblies
• Enhanced durability through passivated surface treatment that improves corrosion resistance and extends service life
• Optimized drive engagement with Phillips No. 3 drive style for efficient installation and reduced cam-out risk
• Full thread coverage along the 1-1/2" length provides maximum grip and distribution of clamping force
• Regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 316 Stainless Steel rounded head screws deliver critical performance advantages in demanding industrial applications where corrosion resistance and mechanical reliability are paramount. The UNF fine threading with Class 2A fit provides superior vibration resistance in machinery, automotive, and precision equipment assemblies. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making these fully threaded screws ideal for marine environments, chemical processing equipment, and food processing machinery where exposure to moisture and aggressive chemicals is common. The combination of 80,000 psi tensile strength and Rockwell B85 hardness ensures these Phillips drive screws maintain structural integrity under sustained mechanical stress, while the rounded pan head design distributes clamping force effectively without damaging mating surfaces.

Specification Summary & Compliance

These screws feature precision 1/4"-28 UNF fine threads with Class 2A thread fit tolerances ensuring consistent engagement and reliable performance. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming adherence to hazardous substance restrictions. The fully threaded design with right-hand threading provides complete fastening capability across the entire 1-1/2" length.