S-92979A261 5/16"-18 x 1 1/2" IFI 111, SAE J429 Medium-Strength Grade 5 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• High tensile strength of 110,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Zinc-plated steel construction provides excellent corrosion resistance, extending the fastener's service life in various environments.
• Flanged hex head design offers a larger bearing surface for improved grip and easier installation without separate washers.
• UNC coarse threading with Class 2A fit allows for quick assembly and better tolerance to debris in industrial settings.
• Grade 5 classification and Rockwell C22 hardness guarantee consistent mechanical properties and durability under heavy loads.
• Partial threading provides an unthreaded shank for enhanced shear strength in specific joint designs.
• Compliance with SAE J429, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations for safe, global use.

Professional Applications & Engineering Value

This Grade 5 heavy-duty hex head screw is engineered to address critical fastening challenges in industrial machinery, construction, and automotive assemblies. Its zinc-plated steel material offers robust protection against rust, while the UNC coarse thread and external hex drive facilitate rapid installation in high-vibration environments. The flanged design distributes clamping force evenly, preventing surface damage and loosening. With a tensile strength of 110,000 psi and partial threading, it provides superior resistance to shear and tensile stresses, making it ideal for structural applications where reliability is paramount. This screw meets rigorous standards, ensuring consistent performance in industrial fastening solutions that demand high strength and durability.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse threading with a 5/16"-18 size. It is manufactured in accordance with IFI 111 / SAE J429 specifications for Grade 5 screws, ensuring mechanical properties like Rockwell C22 hardness and 110,000 psi tensile strength. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms it is free from hazardous substances, making it suitable for regulated industrial and international markets.