S-90129A115 5/16"-18 x 1/2" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with a black protective coating, extending service life in harsh industrial environments.
• High tensile strength of 120,000 psi ensures reliable performance under heavy loads, preventing fastener failure.
• Rockwell C22 hardness provides excellent wear resistance and durability for repeated use.
• Fully threaded UNC coarse spacing allows for faster installation and superior grip in a wide range of materials.
• Flanged hex head design distributes clamping force evenly, reducing the risk of surface damage and improving stability.
• Class 2A thread fit offers consistent, reliable engagement with standard nuts and tapped holes, minimizing assembly issues.
• Compliance with SAE J429, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations for safe, global use.

Professional Applications & Engineering Value

Engineered for demanding environments, this Grade 5 hex head screw in black corrosion-resistant coated steel addresses common industrial challenges such as vibration loosening and environmental degradation. The fully threaded UNC coarse thread design ensures rapid, secure fastening in structural assemblies, machinery, and automotive components, where high tensile strength and consistent performance are critical. The external hex drive and flange provide enhanced torque transmission and load distribution, reducing the need for washers and simplifying maintenance. Ideal for heavy-duty applications, it offers long-term reliability by resisting rust and wear, thereby minimizing downtime and replacement costs in sectors like construction, manufacturing, and equipment repair.

Specification Summary & Compliance

This screw features precise Class 2A thread fit per UNC standards, with dimensions including a 5/16"-18 thread size and 1/2" length. It meets IFI 111 specifications aligned with SAE J429 for Grade 5 mechanical properties, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry adherence.