S-91271A591 5/16"-18 x 2" IFI 115 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi provides superior resistance to mechanical stress and prevents failure in demanding applications
• Class 3A thread fit ensures precise, secure mating with Class 2B nuts for vibration-resistant assemblies with minimal backlash
• Flanged design eliminates the need for separate washers, distributing clamp load evenly and speeding up installation
• Alloy steel construction with Rockwell C37 hardness delivers outstanding durability and wear resistance in harsh industrial environments
• External 12-point drive allows for high-torque installation with standard tools while providing superior access in confined spaces
• Partial threading optimizes grip length for specific applications while maintaining maximum unthreaded shank strength
• Regulatory compliance with RoHS 3, REACH, and IFI 115 specifications ensures environmental responsibility and quality assurance

Professional Applications & Engineering Value

These 12-point flange screws deliver critical performance advantages for heavy-duty industrial applications where reliability is paramount. The alloy steel composition, combined with Rockwell C37 hardness, provides exceptional resistance to shear forces and fatigue in high-vibration environments such as heavy machinery, construction equipment, and automotive assemblies. The 5/16"-18 UNC coarse thread with Class 3A precision ensures rapid installation while maintaining secure fastening integrity. The integrated flange design eliminates washer requirements, reducing component count and assembly time while providing superior bearing surface distribution. These partially threaded screws offer optimal clamping force control, making them ideal for applications requiring precise grip length management in structural connections and equipment mounting.

Specification Summary & Compliance

This 5/16"-18 UNC 12-point flange screw features Class 3A thread fit for precision assembly, manufactured to IFI 115 specifications with partial threading and right-hand coarse thread configuration. The fastener maintains dimensional accuracy with 2" length, 5/16" head dimensions, and 15/32" flange diameter. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring restricted substance control.