S-90211A336 1/2"-13 x 1 3/4" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with Grade 8 strength rating and 150,000 psi tensile strength for critical heavy-duty applications
• Superior corrosion protection through zinc yellow-chromate plating, extending service life in harsh industrial environments
• Precise thread engagement with Class 3A fit and UNC coarse threads ensuring reliable assembly in high-vibration settings
• Enhanced installation efficiency with external hex drive design providing secure tool grip and torque transmission
• Left-hand threading advantage for specialized applications where reverse threading prevents loosening under rotational forces
• Full-threaded design offering consistent gripping strength along the entire 1 3/4" length for maximum holding power
• Industry compliance assurance meeting SAE J429 specifications for quality and performance reliability

Professional Applications & Engineering Value

Engineered for demanding industrial scenarios, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The left-hand UNC coarse threading provides critical anti-loosening properties in rotating equipment, while the Class 3A thread fit ensures precise tolerance control for vibration-resistant assemblies. The zinc yellow-chromate plating creates a robust barrier against corrosion in outdoor or chemically aggressive environments. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain structural integrity in heavy machinery, construction equipment, and automotive systems where dynamic loads and stress concentrations demand superior mechanical properties and reliable SAE J429 compliance.

Specification Summary & Compliance

This 1/2"-13 UNC left hand hex head screw features precise Class 3A thread fit tolerances and coarse thread spacing for optimal engagement. Manufacturing adheres to SAE J429 specifications for Grade 8 fasteners, ensuring consistent quality and performance. The zinc yellow-chromate plating provides corrosion resistance while maintaining dimensional accuracy. The fastener meets industry standards for heavy-duty applications with verified mechanical properties including Rockwell C33 hardness and 150,000 psi tensile strength, making it suitable for rigorous industrial use where compliance with established engineering standards is mandatory.