S-91286A621 3/8"-16 x 5/8" 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 prolongs 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.
• Coarse UNC threading with Class 2A fit allows for quick, easy installation and secure fastening, even in materials with varying densities.
• Full threading and external hex drive offer maximum grip and straightforward torque application, speeding up assembly processes.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability in professional settings.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for demanding industrial applications where strength and reliability are non-negotiable. Made from high-grade steel and featuring a zinc-flake coated finish, it effectively combats corrosion in outdoor or chemically exposed settings, such as construction machinery, automotive assemblies, and heavy equipment manufacturing. The 3/8"-16 UNC coarse thread and Class 2A fit provide superior holding power in metals and composites, reducing the likelihood of stripping and ensuring long-term joint integrity. With a fully threaded design and external hex drive, it simplifies installation in tight spaces, enhancing efficiency in production lines and maintenance operations. Ideal for structural frameworks and high-vibration environments, this screw delivers consistent performance, minimizing downtime and supporting robust engineering solutions.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse spacing for reliable performance. It meets ASME B18.2.1 and SAE J429 specifications, ensuring uniformity and strength in industrial use. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it supports environmental and safety regulations, making it suitable for global markets.