S-90409A186 5/8"-18 x 1 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: With 150,000 psi tensile strength and Rockwell C32 hardness, this screw withstands extreme mechanical stresses in heavy machinery and structural applications.
• Enhanced Fastening Stability: The integrated flange distributes load evenly, reducing the risk of surface damage and providing superior vibration resistance without separate washers.
• Precision Thread Engagement: Class 2A thread fit ensures consistent, reliable mating with nuts and tapped holes, minimizing cross-threading and assembly errors.
• Superior Corrosion & Wear Resistance: Made from high-strength Grade 8 steel, it offers long-term durability in harsh industrial environments.
• Optimized Torque Application: The 15/16" external hex head allows for high-torque installation using standard tools, speeding up assembly in time-sensitive operations.
• Full Thread Coverage for Versatility: Fully threaded design provides continuous grip along the entire 1 3/4" length, accommodating various material thicknesses.
• Regulatory Compliance Assurance: Meets SAE J429, RoHS 3, and REACH standards, ensuring safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this Grade 8 hex head screw addresses critical challenges in heavy equipment, automotive assemblies, and construction frameworks. The 5/8"-18 UNF fine thread delivers superior resistance to loosening under dynamic loads, while the flanged design eliminates the need for additional washers, reducing part count and assembly time. Constructed from high-tensile steel, it maintains integrity in high-stress environments where fatigue failure is a concern. The external hex drive facilitates quick installation with common tools, enhancing productivity in maintenance and manufacturing lines. Ideal for bolting applications requiring 150,000 psi tensile strength, it ensures reliable performance in machinery bases, structural supports, and hydraulic systems where safety and durability are paramount.

Specification Summary & Compliance

This fastener features a Class 2A thread fit per UNF standards, ensuring precise dimensional accuracy for consistent assembly. Manufacturing adheres to SAE J429 specifications for Grade 8 mechanical properties, including hardness and tensile requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing the absence of restricted hazardous substances. Dimensions include a 1 3/4" length, 15/16" hex head width, and 1 21/64" flange diameter, all measured in the inch system for compatibility with North American industrial standards.