S-91268A868 3/4"-10 x 5 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 applications, reducing the risk of fastener failure.
• Grade 8 steel construction with Rockwell C33 hardness provides superior durability and resistance to wear and deformation under heavy loads.
• Coarse UNC threading with Class 2A fit offers quick assembly and secure fastening, minimizing cross-threading issues in industrial settings.
• Partially threaded design with a 1 3/4" minimum thread length allows for precise clamping force distribution and vibration resistance.
• External hex drive and hex head facilitate easy installation and removal with standard tools, improving maintenance efficiency.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability for engineering projects.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence in global supply chains.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and vibration resistance are paramount. The steel material and Rockwell C33 hardness provide excellent fatigue resistance, reducing downtime in demanding environments. With its coarse UNC thread and Class 2A fit, it ensures rapid installation and reliable holding power, even in applications subject to dynamic loads. The partial threading design optimizes stress distribution along the shank, preventing loosening in structural connections. Ideal for use in industrial fastening systems, this screw meets rigorous standards like ASME B18.2.1, offering engineers a dependable solution for heavy-duty bolting needs while adhering to RoHS and REACH regulations for sustainable operations.

Specification Summary & Compliance

This screw features precise inch system measurements, including a 3/4"-10 UNC coarse thread with Class 2A thread fit for consistent accuracy. It adheres to ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring dimensional reliability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms it is free from hazardous substances, supporting environmental and safety standards in industrial applications.