S-91247A413 9/16"-18 x 4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced Durability: Zinc plating provides superior corrosion resistance, extending service life in harsh industrial environments.
• High Tensile Strength: Grade 5 classification and 120,000 psi tensile strength ensure reliable performance under heavy loads and stress.
• Secure Fastening: Fine UNF threads (9/16"-18) and Class 2A fit offer excellent vibration resistance and precise assembly.
• Efficient Installation: External hex drive and 13/16" head width allow for high-torque application with standard tools, reducing installation time.
• Optimized Material Strength: Rockwell C25 hardness provides a balance of toughness and durability, resisting wear and deformation.
• Versatile Threading: Partially threaded design with a minimum 1 3/8" thread length provides flexibility for various clamping and spacing needs.
• Regulatory Compliance: Meets ASME B18.2.1, SAE J429, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 9/16"-18 UNF Grade 5 hex head screw is engineered to address critical fastening challenges in industrial and construction settings. The zinc plated steel construction combats corrosion, reducing maintenance costs in exposed environments. Its fine UNF threads and Class 2A fit ensure a tight, secure connection that resists loosening under vibration, a common issue in machinery and structural assemblies. The external hex drive facilitates high-torque installation, enabling efficient assembly in confined spaces. With a 120,000 psi tensile strength and Rockwell C25 hardness, it provides the necessary durability for heavy-duty applications, from equipment manufacturing to infrastructure projects, ensuring long-term reliability and performance.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards with a Class 2A thread fit and UNF thread type (9/16"-18), ensuring compatibility and interchangeability. It is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications for Grade 5 hex head screws. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations is confirmed, guaranteeing the product is free from hazardous substances and safe for use in various markets.