S-92316A808 5/8"-11 x 3 1/2" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength: With a 150,000 psi rating, this screw provides superior resistance to breaking and stripping under extreme loads, ensuring reliable performance in critical applications.
• Enhanced Corrosion Resistance: The Black-Phosphate Steel finish offers excellent protection against rust and corrosion, extending the fastener's service life in harsh industrial environments.
• Superior Hardness & Wear Resistance: A Rockwell C32 hardness rating ensures the screw maintains its structural integrity and resists deformation, even under high-stress conditions.
• Optimized for High Torque Application: The external hex drive and flange design provide a larger bearing surface and superior grip, allowing for higher torque application and preventing loosening.
• Reliable & Standardized Threading: The 5/8"-11 UNC coarse thread and Class 2A fit ensure easy, fast assembly and a secure, vibration-resistant connection in a wide range of materials.
• Heavy-Duty Grade 8 Certification: Manufactured to meet Grade 8 standards, this fastener is guaranteed for high-strength applications, providing confidence in its mechanical properties.
• Versatile Partially Threaded Design: The 3 1/2" length with a partially threaded shank offers flexibility for applications requiring both clamping force and unthreaded shear strength.

Professional Applications & Engineering Value

This Grade 8 Hex Head Screw is engineered for demanding scenarios where failure is not an option. The core Black-Phosphate Steel construction, combined with its high tensile strength and Rockwell C32 hardness, directly addresses the industrial need for fasteners that can withstand severe vibrational loads, shock, and stress without fatiguing. The UNC coarse thread is specifically advantageous for rapid assembly in softer materials or where debris is present, reducing the risk of cross-threading. The integrated flange eliminates the need for a separate washer, distributing clamp load more effectively and providing a stable, flush mount—ideal for heavy machinery, structural steel framing, and automotive assemblies. This design solves common pain points like joint slippage, corrosion-induced failure, and installation inefficiency, making it a heavy-duty solution for engineers and procurement specialists.

Specification Summary & Compliance

This 5/8"-11 Hex Head Screw features a Class 2A thread fit for standard clearance and assembly ease, adhering to the UNC (Unified Coarse) thread standard. It is manufactured in compliance with IFI 111 / SAE J429 specifications for Grade 8 fasteners, ensuring dimensional accuracy and mechanical performance. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.