S-90211A228 1/4"-20 x 1 1/2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 150,000 psi tensile strength for secure fastening in high-stress environments
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial conditions
• Precision thread engagement with Class 3A fit and UNC coarse threading ensuring reliable installation and vibration resistance
• Left-hand thread design for specialized applications requiring reverse-threading security and anti-loosening properties
• Optimal torque transmission through external hex drive design, enabling efficient installation with standard tools
• Enhanced durability with Rockwell C33 hardness maintaining structural integrity under repeated stress
• Industry compliance assurance meeting SAE J429 specifications for consistent quality and performance standards

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions where standard fasteners fail. The left-hand UNC threading provides essential counter-rotational security in machinery with rotating components, preventing accidental loosening from normal operation vibrations. Manufactured from high-strength steel with zinc yellow-chromate plating, it withstands corrosive environments while maintaining 150,000 psi tensile strength for heavy-duty structural connections. The Class 3A thread fit ensures precise engagement in automotive, manufacturing, and construction applications where vibration resistance and reliable clamping force are paramount. The external hex drive facilitates quick installation in confined spaces, making it ideal for maintenance and assembly operations requiring high-strength left-hand threaded solutions.

Specification Summary & Compliance

This fastener maintains Class 3A thread tolerances with 1/4"-20 UNC coarse threading and left-hand direction. Manufactured to SAE J429 specifications for Grade 8 requirements, it features Rockwell C33 hardness and 150,000 psi tensile strength. The zinc yellow-chromate plating provides corrosion protection while the fully threaded 1½" length ensures consistent engagement. Complies with industry standards for dimensional accuracy and mechanical properties in high-strength fastener applications.