S-91257A170 5/8"-11 x 10" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity - Grade 8 classification with 150,000 psi tensile strength ensures reliable performance in high-stress industrial applications
• Superior Corrosion Protection - Zinc yellow-chromate plating provides enhanced resistance to rust and environmental degradation
• Optimized Thread Engagement - UNC coarse thread design with Class 2A fit guarantees secure fastening and easier installation in tough materials
• Exceptional Durability - Rockwell C33 hardness rating maintains structural integrity under repeated stress and vibration
• Enhanced Installation Efficiency - External hex drive with 15/16" head width allows for high-torque application using standard tools
• Versatile Partial Threading - 1 3/4" minimum thread length provides flexibility for various clamping requirements and material thicknesses
• Industry Compliance Assurance - Meets ASME B18.2.1 and SAE J429 standards for guaranteed quality and performance consistency

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Grade 8 hex head screws deliver exceptional performance in heavy machinery, structural steel connections, and high-vibration equipment. The zinc yellow-chromate plating provides superior corrosion resistance, making them ideal for outdoor applications or harsh manufacturing conditions where moisture and chemicals are present. The UNC coarse thread pattern ensures rapid installation and reliable holding power in steel frameworks and construction projects. With partial threading and 10" length, these fasteners offer precise clamping force distribution across thick materials and structural components. The external hex drive design accommodates high-torque applications, reducing installation time while maintaining secure fastening in critical load-bearing assemblies.

Specification Summary & Compliance

This 5/8"-11 hex head screw features precise Class 2A thread fit with UNC coarse threading and partial threading configuration. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications. The inch system measurement and standardized dimensions guarantee interchangeability and compatibility with existing industrial equipment and tooling.