S-90306A330 1/2"-13 x 1" Left-Hand Threaded 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and reducing maintenance costs
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under heavy loads
• Secure left-hand thread engagement designed for applications requiring reverse-threading to prevent loosening from counter-clockwise motion
• Optimized coarse UNC threading with Class 2A fit ensures quick assembly, easy installation, and consistent clamping force
• Full threading along the 1" length provides maximum grip and uniform stress distribution for enhanced joint integrity
• External hex drive design allows for high-torque application using standard tools, speeding up installation and removal
• Compliance with RoHS 3 and REACH regulations guarantees safety and environmental standards for industrial and export use

Professional Applications & Engineering Value

These left-hand thread hex head screws are engineered to address specific industrial challenges where standard right-hand threads may loosen under rotational forces. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making these UNC coarse thread fasteners suitable for outdoor machinery, marine equipment, and chemical processing applications. The external hex drive and Class 2A thread fit ensure precise installation with common tools, reducing assembly time and minimizing the risk of cross-threading. With full threading along the entire shank, these screws deliver uniform load distribution, preventing joint failure in high-vibration environments such as rotating machinery, conveyor systems, and automotive assemblies. Their left-hand thread direction is critical for securing components on left-turning shafts, providing a reliable solution for specialized mechanical systems.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC coarse thread with Class 2A fit for standard dimensional accuracy and ease of assembly. It is fully manufactured from 18-8 Stainless Steel, ensuring consistent performance with a tensile strength of 70,000 psi and Rockwell B70 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current industrial safety and environmental standards for hazardous substance restrictions.