S-91271A810 5/8"-11 x 4" IFI 115 12-Point Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with 170,000 psi tensile strength and Rockwell C37 hardness for reliable performance in demanding applications
• Precise thread engagement with Class 3A thread fit ensuring consistent clamping force and vibration resistance
• Enhanced torque transmission through external 12-point drive design for secure installation with standard tools
• Integrated flange design eliminates need for separate washers while distributing load across wider surface area
• Optimized partial threading provides maximum grip length while maintaining unthreaded shank strength
• Corrosion-resistant alloy steel construction maintains structural integrity in harsh industrial environments
• Regulatory compliance assurance with RoHS 3, REACH, and IFI 115 standards for global manufacturing applications

Professional Applications & Engineering Value

This 12-point flanged screw addresses critical challenges in heavy machinery, structural steel connections, and high-vibration equipment assemblies. The alloy steel construction with Rockwell C37 hardness provides exceptional resistance to shear forces and fatigue failure, while the 5/8"-11 UNC coarse thread enables rapid installation in thick materials. The integrated 15/16" flange diameter serves as an embedded washer, preventing surface damage and maintaining joint integrity under dynamic loads. Partial threading concentrates the fastener's strength where needed most, making it ideal for structural applications requiring both high clamp load and precise alignment. The external 12-point drive accommodates standard industrial wrenches, ensuring consistent torque application in confined spaces.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with 5/8"-11 UNC coarse thread specifications, this fastener delivers precision engagement and reliable performance. The 4" length with 1 3/4" minimum thread length provides optimal grip range for various material thicknesses. Compliance with IFI 115 manufacturing standards ensures consistent quality, while RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance confirms environmental responsibility and chemical safety for global industrial applications.