S-90211A230 1/4"-20 x 2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capability with Grade 8 steel construction and 150,000 psi tensile strength for critical high-stress applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial environments
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening performance and vibration resistance
• Enhanced installation control through external hex drive design that accommodates standard wrenching tools
• Left-hand threading functionality for specialized applications requiring reverse-threaded fastening solutions
• Full-length threading for maximum grip length and uniform stress distribution along the entire fastener
• Industry compliance assurance meeting SAE J429 specifications for quality and performance verification

Professional Applications & Engineering Value

This Grade 8 steel hex head screw delivers exceptional engineering value in demanding industrial settings where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness provides reliable performance in high-vibration machinery, heavy equipment assembly, and structural applications. The left-hand UNC coarse thread design addresses specific engineering requirements for components that rotate counter-clockwise, preventing loosening under normal operation. The zinc yellow-chromate plating offers superior protection against corrosion in challenging environments, while the external hex drive enables high-torque installation with standard tools. These industrial screws are engineered to maintain integrity in applications where right-hand threads would naturally loosen, providing critical safety and reliability in automotive, manufacturing, and construction sectors.

Specification Summary & Compliance

This fastener features precise 1/4"-20 UNC coarse thread with Class 3A thread fit tolerances, ensuring optimal engagement and performance. The 2" length and fully threaded design provide consistent fastening capability throughout the entire shank. Manufacturing complies with SAE J429 specifications for Grade 8 fasteners, verifying mechanical properties and quality standards. The zinc yellow-chromate plating meets industry standards for corrosion protection while maintaining dimensional accuracy. This left-hand thread screw maintains the same rigorous specifications as standard right-hand fasteners, providing reliable performance in specialized applications requiring reverse threading solutions.