S-91268A815 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 tensile strength of 150,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Grade 8 steel construction with Rockwell C33 hardness provides superior durability and resistance to wear, extending the service life of your assemblies.
• Partial threading design allows for precise clamping force control and reduces the risk of thread stripping in demanding environments.
• Class 2A thread fit with 5/8"-11 UNC coarse threads offers easy installation and removal while maintaining secure fastening in various materials.
• External hex drive and hex head facilitate quick and efficient tightening with standard tools, saving time during assembly and maintenance.
• Compliance with ASME B18.2.1 standards guarantees consistent quality and interoperability in mechanical and structural applications.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global supply chain integration.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in machinery, construction, and automotive sectors where high tensile strength and durability are paramount. The steel material and Rockwell C33 hardness provide resistance to deformation under extreme loads, while the 5/8"-11 UNC coarse thread and partial threading enhance grip in coarse-grained materials and prevent loosening from vibrations. With an external hex drive and right-hand thread, it simplifies installation in confined spaces, reducing assembly time and labor costs. Ideal for structural fastening, equipment manufacturing, and maintenance operations, this screw delivers consistent performance where reliability cannot be compromised.

Specification Summary & Compliance

This hex head screw features a 3" length with a min thread length of 1 1/2" and Class 2A thread fit for precise dimensional accuracy per UNC standards. Manufactured in accordance with ASME B18.2.1 and SAE J429 specifications, it ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible and safe usage in various industries.