S-91286A410 5/8"-11 x 3" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 8 classification and 150,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the zinc-flake coating, extending service life in harsh industrial environments.
• Optimized for high-torque assembly featuring an external hex drive and 15/16" head width for secure tool engagement and efficient installation.
• Reliable thread engagement with 5/8"-11 UNC coarse threads and Class 2A fit, facilitating quick assembly and reducing cross-threading risks.
• Enhanced durability and wear resistance from Rockwell C33 hardness, maintaining structural integrity through repeated use.
• Versatile partial threading design offering a 1 1/2" minimum thread length for flexible clamping in various material thicknesses.
• Full compliance with industry standards including ASME B18.2.1, RoHS 3, and REACH, ensuring quality and regulatory acceptance.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical performance where failure is not an option. The steel construction combined with 150,000 psi tensile strength provides the structural integrity needed for high-stress connections in machinery, construction, and transportation equipment. The zinc-flake coated finish offers superior corrosion protection, significantly outperforming standard platings in environments exposed to chemicals, moisture, and temperature variations. The 5/8"-11 UNC coarse thread with Class 2A fit ensures rapid assembly with reduced galling, while the external hex drive accommodates high torque applications without stripping. These partially threaded fasteners are specifically designed to provide both clamping force and shear resistance in critical bolted joints.

Specification Summary & Compliance

This hex head screw features precision 5/8"-11 UNC coarse threads with Class 2A thread fit for consistent dimensional accuracy. Manufactured to ASME B18.2.1 specifications where identified with SAE J429, ensuring interchangeability and reliability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety standards for industrial components.