S-92316A766 1/2"-20 x 2 1/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-phosphate steel coating extends service life in harsh industrial environments.
• Flange design eliminates the need for a separate washer, speeding up assembly and providing a larger bearing surface for enhanced load distribution.
• Fine UNF threads and Class 2A fit offer precise, vibration-resistant connections that maintain integrity under dynamic loads.
• Grade 8 classification and Rockwell C32 hardness guarantee high mechanical strength and durability for heavy-duty use.
• Partially threaded shank allows for unthreaded grip length, ideal for applications requiring clamping force without thread engagement.
• External hex drive facilitates easy installation and removal with standard tools, improving maintenance efficiency.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration loosening and corrosion are common issues. The black-phosphate steel provides a protective layer that resists rust, while the UNF fine thread and Class 2A fit ensure tight, secure fastening that withstands dynamic stresses. The flange design distributes clamping force evenly, reducing point stress and preventing surface damage. Ideal for structural frames, engine components, and industrial equipment, this screw delivers reliable performance in demanding environments, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This screw meets precise dimensional standards with a Class 2A thread fit for consistent assembly. It conforms to SAE J429 specifications for Grade 8 fasteners, ensuring high tensile strength and hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free from hazardous substances, making it suitable for global industrial use. Threading is partially threaded with a minimum thread length of 1 1/4", and it features a right-hand thread direction and external hex drive for standardized tool compatibility.