S-91247A566 1/4"-20 x 6" 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 in high-stress applications, reducing the risk of fastener failure
• Zinc plating provides superior corrosion resistance, extending service life in harsh industrial environments and reducing maintenance costs
• Grade 5 classification guarantees consistent hardness (Rockwell C25) for optimal durability and resistance to wear during repeated use
• Coarse UNC threads with Class 2A fit enable faster assembly and better vibration resistance compared to fine-thread alternatives
• Partial threading design combines secure clamping force with flexibility for applications requiring both threaded and unthreaded sections
• External hex drive configuration allows for high-torque installation using standard tools, improving installation efficiency
• Comprehensive regulatory compliance (RoHS 3, REACH) ensures environmental responsibility and global market acceptance

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these Grade 5 hex head screws deliver exceptional value in construction, machinery assembly, and heavy equipment manufacturing. The zinc plated steel construction addresses common corrosion challenges in outdoor or humid environments, while the 1/4-20 UNC coarse thread configuration provides superior grip in softer materials and faster installation times. The partially threaded design offers precise clamping control where full threading isn't required, making these 6-inch screws ideal for structural connections, bracket mounting, and framework assembly. With 120,000 psi tensile strength and Rockwell C25 hardness, they withstand significant dynamic loads and vibration, reducing maintenance intervals and improving overall system reliability in industrial fastener applications.

Specification Summary & Compliance

These hex head screws feature precise Class 2A thread fit tolerances with 1/4-20 UNC coarse thread specifications. Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 5 standards, ensuring dimensional accuracy and mechanical properties. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, confirming environmental safety and material restrictions adherence for global industrial applications.