S-91271A550 1/4"-20 x 2" IFI 115 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 170,000 psi tensile strength for reliable performance in high-stress assemblies
• Superior thread engagement and vibration resistance due to Class 3A fit UNC coarse threading, ensuring secure fastening
• Enhanced durability and wear resistance from alloy steel construction with Rockwell C37 hardness
• Efficient installation and removal with the external 12-point drive and 1/4" drive size, compatible with standard tools
• Integrated flange design eliminates the need for separate washers, providing increased bearing surface and simplifying assembly
• Optimized for demanding environments with partial threading, offering unthreaded shank strength where needed
• Compliance with major industry and environmental standards including IFI 115, RoHS 3, and REACH for safe, regulated use

Professional Applications & Engineering Value

This 12-point flanged screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors where high-strength alloy steel and precise UNC coarse threading prevent loosening under dynamic loads. The Class 3A thread fit ensures minimal backlash and superior clamp load retention, reducing maintenance intervals. Its external 12-point drive allows for high-torque application in confined spaces, while the flanged design distributes pressure evenly, protecting softer materials from damage. Ideal for industrial assembly requiring reliable, repeatable fastening with compliance to stringent specifications.

Specification Summary & Compliance

This fastener adheres to Class 3A thread fit for precise dimensional accuracy under the inch system, with UNC coarse thread (1/4"-20) and partial threading up to a minimum of 1". Manufactured in compliance with IFI 115 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in professional use.