S-90306A220 1/4"-20 x 1/2" Left-Hand Threaded 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh environments
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads
• Rockwell B70 hardness provides excellent durability and wear resistance
• Left-hand thread design prevents loosening in counter-clockwise rotating applications
• Class 2A thread fit offers consistent, reliable assembly with standard nuts
• Full threading along the entire 1/2" length maximizes engagement and holding power
• External hex drive allows for high-torque installation with common tools

Professional Applications & Engineering Value

These left-hand thread hex screws provide critical solutions for applications where reverse rotation is a concern. The 18-8 stainless steel composition delivers superior corrosion resistance in demanding environments, while the coarse UNC threading ensures rapid installation and reliable performance in vibration-prone settings. With 70,000 psi tensile strength and Rockwell B70 hardness, these fasteners maintain integrity under significant stress, making them ideal for machinery, automotive, and industrial equipment where standard right-hand threads would loosen. The external hex drive facilitates quick installation and removal with standard wrenching tools, improving maintenance efficiency.

Specification Summary & Compliance

This 1/4"-20 UNC left-hand hex screw features Class 2A thread fit for consistent assembly tolerance and coarse threading for rapid installation. Manufactured to precise dimensional standards with full threading along the entire 1/2" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications.