S-91271A587 5/16"-18 x 1 1/2" IFI 115 12-Point Screws

Key Features & Benefits at a Glance

• Superior torque transmission with external 12-point drive for reliable installation in high-stress applications
• Enhanced load distribution through integrated flange design, reducing surface pressure and preventing material damage
• Exceptional mechanical strength with 170,000 psi tensile strength and Rockwell C37 hardness for demanding industrial environments
• Precision thread engagement with Class 3A fit UNC coarse threads ensuring vibration resistance and secure fastening
• Full threading capability providing maximum grip length and flexibility across various material thicknesses
• Premium alloy steel construction offering excellent durability and corrosion resistance in harsh operating conditions
• Streamlined installation process with right-hand thread direction and standardized 5/16"-18 UNC specifications

Professional Applications & Engineering Value

This 12-point flanged screw addresses critical engineering challenges in heavy machinery, automotive assemblies, and structural applications where vibration resistance and high tensile requirements are paramount. The alloy steel construction combined with Rockwell C37 hardness ensures exceptional durability against wear and fatigue, while the integrated flange eliminates the need for separate washers, reducing assembly time and potential failure points. The UNC coarse threading with Class 3A fit provides superior engagement in both metallic and composite materials, making it ideal for applications requiring repeated disassembly and reassembly. The external 12-point drive design offers superior torque transmission compared to standard hex drives, preventing tool slippage and ensuring consistent clamping force in high-vibration environments common in industrial equipment and automotive systems.

Specification Summary & Compliance

This fastener maintains precision Class 3A thread fit with 5/16"-18 UNC coarse threading and right-hand direction, manufactured to exact dimensional standards with 1-1/2" length and 15/32" flange diameter. The product strictly adheres to IFI 115 specifications for dimensional and mechanical properties, while meeting critical regulatory requirements including RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) compliance for chemical safety standards, ensuring global acceptability for industrial applications.