S-91286A157 5/16"-18 x 1 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and reliability with Grade 8 classification, supporting heavy-duty applications and reducing failure risks.
• Superior corrosion resistance from the zinc-flake coating, extending service life in harsh industrial environments.
• High tensile strength of 150,000 PSI ensures secure, long-lasting fastening under extreme loads and vibrations.
• Precise UNC coarse threading with Class 2A fit allows for quick assembly and reliable engagement in various materials.
• Durable Rockwell C33 hardness provides excellent wear resistance, minimizing damage during installation and use.
• Full threading along the 1-1/4" length offers maximum grip and adjustability for versatile mounting needs.
• External hex drive design enables easy installation and removal with standard tools, improving workflow efficiency.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this Grade 8 hex head screw combines high-strength steel and a zinc-flake coating to address common challenges like corrosion, vibration loosening, and structural fatigue. Its UNC coarse thread and Class 2A thread fit ensure consistent performance in machinery, construction, and automotive assemblies, where precise torque and durability are critical. The fully threaded design and external hex drive simplify installation in tight spaces, reducing assembly time while maintaining 150,000 PSI tensile strength for secure, reliable connections in high-stress applications.

Specification Summary & Compliance

This fastener adheres to ASME B18.2.1 and SAE J429 standards, with precise Class 2A thread fit and UNC coarse thread specifications for consistent dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.