S-91271A574 1/4"-28 x 1 1/2" IFI 115 12-Point Screws

Key Features & Benefits at a Glance

• Superior torque transmission with the external 12-point drive, enabling secure installation in high-stress applications
• Enhanced joint stability and load distribution thanks to the integrated flange, reducing the need for a separate washer
• Exceptional tensile strength of 170,000 psi for reliable performance in demanding mechanical assemblies
• Precision Class 3A thread fit ensures consistent, vibration-resistant connections in critical equipment
• Durable alloy steel construction with Rockwell C37 hardness provides excellent wear and corrosion resistance
• 1/4"-28 UNF fine threading offers superior holding power compared to coarse threads in specific materials
• Partial threading design allows for unthreaded shank strength where maximum clamp load is required

Professional Applications & Engineering Value

This 12-point flanged screw is engineered to solve critical fastening challenges in industrial and mechanical systems. The alloy steel construction, combined with a Rockwell C37 hardness, provides the durability needed to withstand high cyclic loads and harsh environments, preventing premature failure. The external 12-point drive and flanged head work in tandem to deliver superior torque application and distribute clamp load effectively, minimizing stress concentration on the mating surface. This is particularly valuable in precision assemblies like automotive components, heavy machinery, and aerospace systems where vibration resistance and joint integrity are paramount. The 1/4"-28 UNF fine thread ensures a tight, secure fit in tapped holes, making it an ideal choice for applications requiring high preload and reliability.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF thread with a precision Class 3A thread fit, ensuring tight tolerances for reliable engagement. It is manufactured to meet IFI 115 specifications, guaranteeing consistent quality and performance. 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 safe for use in various industrial and commercial applications.