S-92979A158 3/8"-16 x 7/8" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 110,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Zinc-plated steel construction provides excellent corrosion resistance, extending service life in harsh or outdoor environments.
• Class 3A thread fit offers superior precision and tighter tolerances for secure, vibration-resistant assemblies with minimal backlash.
• Flanged head design eliminates the need for separate washers, simplifying installation and distributing load evenly to prevent surface damage.
• Fully threaded body maximizes grip and holding power along the entire length, ideal for applications requiring consistent clamping force.
• External hex drive allows for high-torque installation with common tools, speeding up assembly and reducing labor time.
• Rockwell C25 hardness ensures durability and resistance to wear, maintaining thread integrity through repeated use.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel hex head screw is engineered to address common industrial challenges such as vibration loosening and corrosion-induced degradation. The coarse UNC thread and Class 3A fit provide rapid assembly with enhanced thread engagement, making it ideal for heavy machinery, structural frameworks, and automotive components where reliability is critical. The flanged feature not only streamlines installation by integrating a washer function but also improves load distribution on softer materials. With a robust external hex drive, it supports high-torque applications without stripping, ensuring long-term performance in demanding environments like construction, manufacturing, and equipment maintenance.

Specification Summary & Compliance

This fastener adheres to IFI 111 / SAE J429 standards, ensuring consistent quality and dimensional accuracy with a Class 3A thread fit for precise engagement. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances for safe industrial use. The screw features a 3/8"-16 UNC coarse thread and is manufactured to meet the specified tensile and hardness requirements, providing reliable performance in regulated applications.