S-90409A192 5/8"-18 x 3 1/4" 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 and wear resistance due to Grade 8 steel construction and Rockwell C32 hardness
• Secure and stable fastening with integrated flange design that distributes load and eliminates the need for separate washers
• Precise thread engagement through UNF fine threads and Class 2A fit, ensuring vibration resistance and reduced loosening
• Easy installation and removal with standard 15/16" external hex head compatible with common industrial tools
• Optimized for partial threading allowing unthreaded shank sections to bear shear loads without thread damage
• Full regulatory compliance meeting SAE J429, RoHS 3, and REACH standards for global industrial acceptance

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions where high tensile strength and vibration resistance are paramount. The steel construction with Rockwell C32 hardness withstands extreme mechanical stresses in heavy machinery, construction equipment, and automotive assemblies. The UNF fine thread pattern maintains clamping force under dynamic loads, while the integrated flange provides superior bearing surface distribution. As a partially threaded fastener, it offers optimal performance in bolted joints requiring precise unthreaded grip lengths. These industrial hex bolts are engineered for applications demanding 150,000 PSI tensile strength and Class 2A thread fit precision, making them ideal for critical structural connections in manufacturing, transportation, and infrastructure projects.

Specification Summary & Compliance

This inch system fastener features precise 5/8"-18 UNF fine threads with Class 2A thread fit tolerances ensuring consistent engagement. Manufacturing complies with IFI 111 specifications meeting SAE J429 requirements for Grade 8 fasteners. The product maintains full compliance with RoHS 3 (2015/863/EU) restrictions and REACH (EC 1907/2006) regulations regarding substance control. Dimensions include 3 1/4" length with 1 21/64" flange diameter and 1 1/2" minimum thread length, providing standardized compatibility across industrial applications.