S-91247A853 3/4"-10 x 4 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance under heavy loads, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from zinc plating extends service life and maintains integrity in harsh or outdoor environments.
• High hardness rating (Rockwell C25) provides excellent wear resistance and durability, minimizing deformation during installation and use.
• Coarse UNC threading offers faster installation and better performance in materials where fine threads may strip or weaken.
• Class 2A thread fit ensures consistent, reliable engagement with nuts and tapped holes, promoting secure fastening with standard tolerances.
• Partial threading design allows for precise clamping force control, ideal for applications where unthreaded shank strength is critical.
• Compliance with industry standards including ASME B18.2.1 and SAE J429 guarantees interchangeability and consistent quality in industrial assemblies.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address critical fastening challenges in heavy machinery, structural steel connections, and industrial equipment assembly. The zinc plated steel construction combats corrosion in environments exposed to moisture or chemicals, while the coarse UNC thread ensures rapid installation and robust holding power in softer materials or where vibration resistance is paramount. With its external hex drive and partially threaded design, it provides superior clamp load distribution and prevents loosening under dynamic loads. Ideal for construction, automotive, and manufacturing sectors, this screw delivers reliable performance where high tensile strength and thread durability are non-negotiable for safety and operational efficiency.

Specification Summary & Compliance

This fastener features precision Class 2A thread fit per UNC standards, ensuring consistent engagement and interchangeability. Manufactured in compliance with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions adherence for global industrial use.