S-91735A412 5/16"-18 x 1 1/2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh chemical environments thanks to 316 stainless steel construction and passivated finish
• Exceptional mechanical strength with 80,000 PSI tensile strength and Rockwell B85 hardness for reliable performance under heavy loads
• Precise thread engagement with Class 2A fit and UNC coarse threading for faster assembly and reduced cross-threading risk
• Full-length threading provides maximum grip and holding power across the entire screw length
• Industry-standard compliance with ASME B18.6.3 ensures dimensional accuracy and interchangeability
• Enhanced chemical safety with RoHS 3 and REACH compliance for regulated industrial applications
• Secure Phillips drive (No. 4 size) with rounded pan head offers balanced torque transmission and clean aesthetic finish

Professional Applications & Engineering Value

These 316 stainless steel rounded head screws deliver critical performance advantages in corrosive and high-stress environments. The combination of UNC coarse threads and Class 2A thread fit ensures rapid installation while maintaining precise tolerance control, significantly reducing assembly time in production lines. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making these Phillips drive screws ideal for chemical processing equipment, marine applications, and food processing machinery where exposure to chlorides and acidic compounds would compromise ordinary fasteners. With full threading along the 1-1/2" length, they provide maximum thread engagement in both thin and thick materials, eliminating the need for multiple screw types in mixed-material assemblies.

Specification Summary & Compliance

This 5/16"-18 UNC screw features Class 2A thread fit per ASME B18.6.3 specifications, ensuring dimensional accuracy and interchangeability. Manufacturing complies with ASME B18.6.3 standards for slotted head screws, with additional compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. The coarse thread spacing and fully threaded design provide reliable fastening performance across various material thicknesses while maintaining the mechanical properties of 316 stainless steel with Rockwell B85 hardness and 80,000 PSI tensile strength.