S-91903A034 5/8"-11 Hex Nuts

Key Features & Benefits at a Glance

• Superior load distribution thanks to the extra wide hex profile, reducing stress concentration and preventing joint failure in heavy-duty applications
• Exceptional corrosion resistance provided by the zinc-plated steel construction, ensuring long-term reliability in harsh industrial environments
• High-strength Grade 5 rating delivers reliable performance under significant tensile and shear stresses, suitable for critical structural connections
• Easy and quick installation with coarse 5/8"-11 UNC threads and Class 2B fit, enabling faster assembly and reducing labor time
• Enhanced grip and torque application from the external hex drive design, allowing secure tightening with standard wrenches
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated industries and global markets
• Dimensional precision with consistent 1 1/16" width and 39/64" height, guaranteeing interchangeability and fit in standardized assemblies

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel extra wide hex nut is engineered to address common industrial challenges such as vibration-induced loosening, corrosion degradation, and high-load fatigue. The 5/8"-11 UNC coarse thread design ensures rapid installation and robust holding power, while the extra wide profile distributes clamping force evenly, minimizing surface damage and maintaining joint integrity. Ideal for heavy-duty applications in construction, machinery, and transportation equipment, this nut provides reliable performance where Class 2B thread fit and corrosion resistance are critical. The zinc plating acts as a sacrificial layer, extending service life in exposed environments, making it a cost-effective solution for maintenance and OEM applications requiring durable inch system fasteners.

Specification Summary & Compliance

This hex nut features 5/8"-11 UNC coarse threads with Class 2B thread fit for consistent engagement and ease of assembly. Manufactured from zinc-plated steel with dimensions of 1 1/16" width and 39/64" height, it meets Grade 5 strength requirements for high-stress applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial use.