S-91268A795 9/16"-12 x 4" 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 durability and wear resistance provided by Rockwell C33 hardness, extending the fastener's service life in harsh industrial environments.
• Easy installation and removal with an external hex drive and 13/16" head width, allowing for high torque application with standard tools.
• Secure and reliable thread engagement due to the 9/16"-12 UNC coarse thread and Class 2A thread fit, reducing the risk of cross-threading and ensuring consistent clamping force.
• Optimized for varied grip lengths with partial threading and a 4" length, providing flexibility in assembly where full threading isn't required.
• Compliance with major industry standards including ASME B18.2.1 and SAE J429, guaranteeing interchangeability and quality for professional use.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, ensuring safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical fastening challenges in heavy machinery, construction, and automotive assemblies. The steel material and coarse UNC thread provide excellent vibration resistance and quick assembly, reducing downtime in production lines. With a 150,000 psi tensile strength and Rockwell C33 hardness, it withstands extreme loads and abrasion, preventing failure in structural applications. The partial threading design allows for precise clamping on thick materials, while the external hex drive ensures easy access in confined spaces. Ideal for industrial-grade bolting where reliability and compliance with ASME B18.2.1 and SAE J429 standards are paramount, this screw delivers consistent performance in demanding environments.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent engagement and a 9/16"-12 UNC coarse thread with a minimum thread length of 1 3/8". It meets ASME B18.2.1 and SAE J429 specifications for Grade 8 bolts, ensuring high strength and reliability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms it is free from hazardous substances, making it suitable for regulated industrial and international markets.