S-91268A109 1/4"-20 x 2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load Capacity - With 150,000 psi tensile strength and Rockwell C33 hardness, these screws withstand extreme mechanical stress and prevent failure in demanding applications.
• Superior Thread Engagement - UNC coarse threading and Class 2A thread fit ensure quick assembly, reduced cross-threading risk, and reliable fastening in various materials.
• Enhanced Durability - Made from high-grade steel with a hex head and external hex drive, providing excellent resistance to wear, corrosion, and tool slippage during installation.
• Optimized for Industrial Use - Partially threaded design offers a non-threaded shank for precise clamping force distribution, ideal for structural and machinery assemblies.
• Regulatory Compliance - Meets ASME B18.2.1 and SAE J429 standards, plus RoHS 3 and REACH compliance, ensuring safety and environmental responsibility in global supply chains.
• Easy Installation & Removal - Right-hand thread direction and 7/16" head width allow for straightforward tightening with common tools, reducing labor time and costs.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery manufacturing, automotive assemblies, and construction projects. The steel material and UNC coarse threading provide exceptional shear and tensile resistance, minimizing the risk of loosening under vibration or dynamic loads. The partially threaded design ensures that the unthreaded shank bears clamping forces efficiently, reducing stress concentrations and enhancing joint integrity. With a 2" length and external hex drive, it offers versatility for applications requiring deep penetration and secure fastening, while compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent performance and interoperability in professional environments.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNC coarse thread specifications. It meets ASME B18.2.1 and SAE J429 manufacturing standards, ensuring reliability in mechanical properties. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmentally safe and regulated industrial use.