S-92316A248 5/8"-18 x 5" 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 provided by Black-Phosphate Steel coating, extending service life in demanding environments
• Enhanced driving torque capability through external hex drive design and 15/16" head width for secure installation
• Precise thread engagement with Class 2A thread fit and UNF fine threading for vibration-resistant connections
• Increased bearing surface area from the integrated flange design, distributing load more effectively
• Optimized partial threading allowing for both secure fastening and clearance in assembly applications
• Heavy-duty construction meeting Grade 8 specifications with Rockwell C32 hardness for maximum durability

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where failure is not an option. The Black-Phosphate Steel coating provides essential corrosion protection in harsh operating environments, while the 5/8"-18 UNF fine thread configuration ensures superior vibration resistance compared to coarse thread alternatives. The partially threaded design allows the unthreaded portion to function as a precision pilot, maintaining alignment in critical assemblies. With 150,000 PSI tensile strength and Rockwell C32 hardness, this fastener withstands extreme mechanical stresses in construction, automotive, and manufacturing applications where reliability is paramount. The external hex drive and flanged head combine to provide excellent torque transmission and load distribution without requiring separate washers.

Specification Summary & Compliance

This 5/8"-18 UNF hex head screw features Class 2A thread fit tolerance for precise engagement and meets IFI 111 and SAE J429 manufacturing specifications. The fastener is fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, ensuring safe use in regulated industries. Manufactured to Grade 8 strength classification with Rockwell C32 hardness and 150,000 PSI tensile strength, this inch-system fastener delivers consistent performance across industrial applications requiring reliable, high-strength fastening solutions.