S-91271A761 1/2"-20 x 1 3/4" IFI 115 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI for reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precision Class 3A thread fit ensures tighter tolerances and superior engagement, minimizing backlash and improving assembly accuracy.
• Integrated flange design eliminates the need for a separate washer, speeding up installation and providing a larger bearing surface for enhanced load distribution.
• Fully threaded shank offers maximum grip length and uniform clamping force along the entire fastener, ideal for varying material thicknesses.
• Alloy steel construction with Rockwell C37 hardness delivers excellent durability and resistance to wear, extending service life in demanding environments.
• External 12-point drive allows for high-torque application with standard tools, facilitating secure installations in confined spaces.
• Compliance with IFI 115, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, supporting responsible sourcing and use.

Professional Applications & Engineering Value

This 12-point flanged screw is engineered to address critical challenges in heavy machinery, automotive, and structural assemblies where vibration resistance and high clamp load are paramount. The alloy steel material, combined with a Rockwell C37 hardness, provides superior strength-to-weight ratio, reducing the risk of stripping or shearing under dynamic loads. The UNF fine threading and Class 3A fit ensure precise, repeatable fastening in components requiring minimal clearance and high reliability, such as engine blocks or precision equipment. The integrated flange distributes stress effectively, preventing surface damage and maintaining joint integrity over time. By utilizing this fully threaded design, engineers can achieve consistent preload and avoid loosening in applications exposed to thermal cycling or shock loads, making it an optimal choice for industrial fastening solutions that demand longevity and compliance with stringent specifications.

Specification Summary & Compliance

This screw adheres to inch system measurements with a thread size of 1/2"-20 UNF and a Class 3A thread fit for high precision. It meets IFI 115 specifications for dimensional and mechanical properties, ensuring consistent quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and suitable for global industrial use.