S-91286A434 5/8"-11 x 7" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the zinc-flake coating extends service life in harsh environments, minimizing maintenance and replacement costs.
• High hardness (Rockwell C33) provides excellent wear resistance, maintaining thread integrity and drive engagement over repeated use.
• Coarse UNC threads with Class 2A fit offer quick assembly and secure fastening, improving installation efficiency in coarse-grained materials.
• Partially threaded design allows for precise clamping force control, ideal for applications requiring specific unthreaded shank sections.
• External hex drive and hex head enable high-torque application with standard tools, ensuring tight fastening in heavy-duty settings.
• Compliance with ASME B18.2.1 and SAE J429 guarantees consistent quality and interchangeability, meeting rigorous industrial standards.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and durability are paramount. The zinc-flake coated steel construction combats corrosion in outdoor or chemically aggressive environments, significantly reducing downtime and lifecycle costs. With its coarse UNC thread and Class 2A thread fit, it ensures rapid, secure fastening in structural joints and equipment frames, while the partial threading allows for optimized load distribution. Ideal for bolting large components in industrial settings, this fastener delivers reliable performance under extreme mechanical stress, supported by its compliance with ASME B18.2.1 and SAE J429 specifications.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse thread with 5/8"-11 size. It meets manufacturing specifications per ASME B18.2.1 and SAE J429 for Grade 8 fasteners, ensuring high strength and reliability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental and safety standards, making it suitable for global industrial use.