S-91286A435 5/8"-18 x 1 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the zinc-flake coating extends service life in harsh environments, minimizing maintenance and replacement costs.
• High hardness rating (Rockwell C33) provides excellent wear resistance and durability under heavy loads and vibration.
• UNF fine thread design with Class 2A fit offers precise engagement and maximum holding power, preventing loosening in critical assemblies.
• Fully threaded shank allows for consistent clamping force along the entire length, enhancing joint integrity in varied material thicknesses.
• External hex drive and hex head facilitate easy installation and removal with standard tools, improving assembly efficiency.
• Compliance with industry standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interoperability in professional settings.

Professional Applications & Engineering Value

Engineered for demanding environments, this Grade 8 hex head screw combines high-strength steel and a zinc-flake coating to address common industrial challenges like corrosion and mechanical stress. The 5/8"-18 UNF fine thread with Class 2A fit ensures tight, secure fastening in heavy machinery, construction equipment, and automotive assemblies, where vibration resistance is critical. Its fully threaded design provides uniform load distribution, reducing the risk of joint failure. Ideal for applications requiring 150,000 PSI tensile strength, this fastener supports long-term reliability in sectors such as manufacturing, infrastructure, and transportation, delivering consistent performance under extreme conditions.

Specification Summary & Compliance

This product features precise Class 2A thread fit per UNF standards, with dimensions including a 1 1/2" length and 5/8"-18 thread size. It meets ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free from hazardous substances, supporting safe and sustainable industrial use.