S-90409A111 1/4"-20 x 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance and durability through Grade 8 steel construction and Rockwell C32 hardness
• Easy installation and removal with external hex drive design providing secure tool engagement
• Enhanced vibration resistance from the integrated flange that distributes load and eliminates need for separate washers
• Precise thread engagement with UNC coarse threading and Class 2A fit ensuring consistent fastening performance
• Full thread coverage along the entire 1/2" length for maximum grip strength in various material thicknesses
• Regulatory compliance assurance meeting industrial standards and environmental regulations for global applications

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value for demanding industrial applications where failure is not an option. The 150,000 psi tensile strength and Rockwell C32 hardness provide critical resistance against shear forces and material fatigue in heavy machinery, construction equipment, and automotive assemblies. The fully threaded UNC coarse design ensures rapid installation and superior holding power in both soft and hard materials, while the integrated flange eliminates washer requirements and provides enhanced bearing surface. Manufactured from high-grade steel with external hex drive, these screws withstand extreme torque applications without stripping, making them ideal for maintenance, repair, and OEM applications where reliability and durability are paramount.

Specification Summary & Compliance

This 1/4"-20 hex head screw features precision UNC coarse threading with Class 2A fit for consistent dimensional accuracy. The fastener meets IFI 111/SAE J429 specifications for Grade 8 mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. With complete threading across the 1/2" length and 9/16" flange diameter, this screw maintains strict manufacturing standards for industrial fastener applications requiring verified performance and regulatory adherence.