S-91247A818 5/8"-11 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 outdoor conditions
• Grade 5 classification guarantees consistent quality with Rockwell C25 hardness for excellent durability and wear resistance
• 5/8"-11 UNC coarse thread design enables faster installation and better grip in softer materials and structural applications
• External hex drive with 15/16" head width offers secure tool engagement and high torque capability for efficient assembly
• Partially threaded shank design provides optimal clamping force distribution and prevents joint loosening under vibration
• Class 2A thread fit ensures smooth assembly while maintaining proper clearance for production efficiency

Professional Applications & Engineering Value

These Grade 5 hex head screws deliver exceptional engineering value across demanding industrial sectors. The zinc plated steel construction provides critical corrosion protection for outdoor construction equipment, agricultural machinery, and structural steel connections where environmental exposure is a concern. The 5/8"-11 UNC coarse thread configuration offers superior pull-out resistance in wood, light structural steel, and composite materials, while the external hex drive accommodates high torque applications common in heavy equipment maintenance and industrial assembly. With partial threading optimizing clamp load distribution, these fasteners prevent joint failure in vibrating machinery and transportation equipment, making them ideal for construction frameworks, machinery bases, and infrastructure projects requiring reliable, high-strength connections.

Specification Summary & Compliance

This 6" hex head screw features precise Class 2A thread fit per UNC standards with 1½" minimum thread length and coarse thread spacing. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe use across global markets.