S-90409A177 5/8"-11 x 2 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 wear resistance due to Rockwell C32 hardness, extending service life in demanding environments
• Quick installation and removal with external hex drive and 15/16" head width for efficient tool engagement
• Enhanced stability and distribution through integrated flange design, eliminating the need for separate washers
• Secure fastening in various materials with coarse UNC threading and Class 2A fit for vibration resistance
• Full-length gripping power with completely threaded shank for maximum holding strength along the entire fastener
• Regulatory compliance assurance meeting SAE J429, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

These Grade 8 steel hex head screws deliver critical reliability in heavy machinery, structural steel connections, and industrial equipment where high tensile strength and vibration resistance are paramount. The fully threaded UNC coarse thread design ensures maximum engagement in both metallic and composite materials, while the integrated flange provides superior load distribution without requiring additional components. Engineered to SAE J429 specifications with Rockwell C32 hardness, these external hex drive fasteners withstand extreme mechanical stresses in construction, automotive, and manufacturing applications where failure is not an option. The right-hand thread direction and Class 2A thread fit guarantee consistent performance in repetitive assembly and disassembly cycles.

Specification Summary & Compliance

Manufactured to precise inch system dimensions including 5/8"-11 UNC coarse thread with Class 2A fit tolerance for reliable engagement. The 2 1/2" length and 1 21/64" flange diameter provide optimal fastening geometry. Compliant with IFI 111 specifications where identified as SAE J429, meeting Grade 8 mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring suitability for international industrial markets.