S-91247A339 7/16"-20 x 6" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 120,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through zinc plating that protects against rust and extends service life in harsh environments
• Optimized thread engagement with fine 7/16"-20 UNF threads and Class 2A fit ensuring vibration resistance and secure fastening
• Enhanced installation efficiency featuring external hex drive and standard 5/8" head width for easy wrench access and torque application
• Controlled thread placement through partial threading design that concentrates threads where needed while maintaining shank strength
• Proven material reliability with Grade 5 steel construction and Rockwell C25 hardness balancing strength with appropriate ductility
• Industry-standard compatibility meeting ASME B18.2.1 and SAE J429 specifications for consistent performance across applications

Professional Applications & Engineering Value

This 7/16"-20 UNF hex head screw delivers critical engineering solutions for industrial assembly challenges. The Grade 5 steel construction provides the optimal balance between strength and machinability, while the zinc plated finish creates a protective barrier against environmental corrosion in manufacturing facilities, outdoor equipment, and structural frameworks. The fine thread design offers superior resistance to vibrational loosening compared to coarse threads, making it ideal for machinery, automotive components, and heavy equipment where dynamic loads are present. With partial threading, the fastener maintains full shank diameter through unthreaded sections, preventing stress concentration points and providing enhanced shear strength. The external hex drive configuration ensures compatibility with standard tools and allows for high torque application during installation, reducing assembly time while maintaining joint integrity.

Specification Summary & Compliance

This hex head screw features precision 7/16"-20 UNF fine threads with Class 2A thread fit ensuring proper engagement and interchangeability. Manufacturing conforms to ASME B18.2.1 and SAE J429 Grade 5 specifications, guaranteeing dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations regarding chemical safety, making it suitable for global industrial applications with environmental compliance requirements.