S-91903A031 5/16"-18 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced Durability: Grade 5 steel construction provides superior tensile strength and fatigue resistance, ideal for high-stress applications.
• Corrosion Protection: Zinc plating offers excellent rust resistance, extending service life in harsh or outdoor environments.
• Easy Installation & Removal: Extra wide hex profile allows for better tool engagement and higher torque application with standard wrenches.
• Reliable Thread Engagement: Class 2B thread fit ensures smooth assembly and consistent clamping force without cross-threading risks.
• Broad Compatibility: 5/16"-18 UNC coarse thread design works seamlessly with common bolts and studs in industrial machinery and equipment.
• Regulatory Compliance: Meets RoHS 3 and REACH standards, ensuring safe use in regulated industries and global markets.
• Heavy-Duty Performance: Engineered for demanding applications where vibration resistance and long-term reliability are critical.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel extra wide hex nut delivers exceptional performance in heavy-duty industrial applications such as construction equipment, automotive assemblies, and machinery frames. The UNC coarse thread design prevents loosening under vibration, while the Class 2B thread fit ensures precise engagement with standard bolts for uniform load distribution. The zinc-plated finish provides a protective barrier against moisture and chemicals, reducing maintenance needs in corrosive environments. Its extra wide hex profile allows for higher torque values during installation, making it ideal for applications requiring secure, long-lasting fastening solutions without stripping or deformation.

Specification Summary & Compliance

This hex nut features a 5/16"-18 UNC coarse thread with Class 2B thread fit for consistent dimensional accuracy. Manufactured from Grade 5 steel, it meets industry standards for strength and reliability. The nut dimensions are 9/16" width and 19/64" height, with a right-hand thread direction and external hex drive. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence.