S-91247A898 7/8"-9 x 7" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc plating, extending service life in harsh industrial environments
• Optimized torque transmission through the external hex drive design, ensuring secure installation and removal
• Enhanced durability with Rockwell C25 hardness, maintaining structural integrity under repeated stress
• Secure fastening in coarse materials enabled by UNC coarse threading with Class 2A fit for consistent engagement
• Versatile partial threading allowing unthreaded shank sections to bear shear loads effectively
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for quality and safety

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where failure is not an option. The combination of high-strength steel construction and zinc plating addresses common challenges of structural integrity and environmental degradation in machinery, construction, and transportation equipment. The 7/8"-9 UNC coarse thread configuration provides superior holding power in softer materials and faster installation times, while the partially threaded design allows the unthreaded portion to function as a precision dowel, resisting shear forces in assembled components. The external hex drive ensures maximum torque application without stripping, making these industrial screws ideal for high-vibration environments where maintaining clamp load is essential for operational safety and equipment longevity.

Specification Summary & Compliance

This fastener features precision Class 2A thread fit with 7/8"-9 UNC coarse threading and right-hand thread direction. Manufactured to ASME B18.2.1 specifications and compliant with SAE J429 Grade 5 requirements, it ensures dimensional accuracy and mechanical performance. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, confirming its suitability for regulated industrial markets. With a minimum thread length of 2-1/4" on a 7" overall length, this partially threaded hex head screw provides engineered solutions for professional applications requiring verified quality standards.