S-90211A296 3/8"-16 x 1 1/2" SAE J429 Left-Hand Threaded High-Strength 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 failure risks.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments.
• Precise Class 3A thread fit guarantees secure fastening with minimal play, enhancing assembly stability.
• Left-hand UNC coarse threading provides effective counter-rotation security in machinery subject to reverse torque.
• Grade 8 steel construction with Rockwell C33 hardness offers excellent durability and wear resistance.
• External hex drive design allows for easy installation and removal with standard tools, improving maintenance efficiency.
• Full threading along the 1 1/2" length ensures consistent grip and load distribution across the fastener.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors where left-hand threads prevent loosening under counter-clockwise forces. The 3/8"-16 UNC coarse thread with Class 3A fit delivers precise engagement, minimizing vibration-induced failures. Made from high-strength steel and finished with zinc yellow-chromate plating, it combats corrosion in outdoor or chemically exposed settings, ensuring long-term reliability. Its fully threaded design and external hex drive simplify installation in tight spaces, reducing downtime and maintenance costs for industrial operations.

Specification Summary & Compliance

This fastener adheres to SAE J429 standards, with inch system measurements including a 3/8"-16 UNC thread size, coarse spacing, and Class 3A thread fit for tight tolerances. It meets industry requirements for dimensional accuracy and is compliant with RoHS and REACH regulations, ensuring environmental safety and performance consistency in professional applications.