S-91286A354 1/2"-13 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: With a 150,000 psi tensile strength, this screw provides superior load-bearing capacity, reducing the risk of failure in high-stress applications.
• Superior Corrosion Resistance: The zinc-flake coating offers excellent protection against rust and corrosion, extending the service life of the fastener in harsh environments.
• High Hardness & Durability: Rockwell C33 hardness ensures the screw maintains its integrity under heavy loads and repeated use, minimizing wear and deformation.
• Reliable Thread Engagement: The 1/2"-13 UNC coarse thread and Class 2A thread fit provide secure, easy installation and vibration resistance in industrial assemblies.
• Optimized for Heavy-Duty Use: Grade 8 classification and partial threading deliver robust performance for demanding applications, from machinery to structural frameworks.
• Wide Regulatory Compliance: Meets ASME B18.2.1, SAE J429, RoHS 3, and REACH standards, ensuring safety, quality, and environmental responsibility.
• Easy Installation & Removal: The external hex drive and right-hand thread design allow for straightforward tightening with standard tools, saving time on assembly lines.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as vibration loosening and material fatigue. Constructed from high-strength steel with a zinc-flake coated finish, it resists corrosion in outdoor or chemically exposed environments, reducing maintenance costs. The 1/2"-13 UNC coarse threading and Class 2A thread fit ensure precise engagement, preventing slippage in machinery, construction, and automotive assemblies. Its 150,000 psi tensile strength and Rockwell C33 hardness make it ideal for bolting applications where reliability under extreme loads is paramount, supporting long-term operational safety and efficiency.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances for consistent performance and is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.