S-90211A338 1/2"-13 x 2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capability with 150,000 psi tensile strength and Rockwell C33 hardness for demanding industrial applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh environments
• Precise thread engagement with Class 3A fit left-hand UNC coarse threads ensuring reliable anti-loosening performance
• Heavy-duty construction meeting Grade 8 standards for exceptional durability in high-stress applications
• Easy installation and removal with standard 3/4" external hex head design for straightforward tool compatibility
• Full-threaded design providing consistent gripping strength along the entire 2" length for maximum holding power
• Industry compliance assurance with SAE J429 specifications for guaranteed quality and performance standards

Professional Applications & Engineering Value

These Grade 8 hex head screws with left-hand UNC coarse threads deliver critical engineering solutions for applications requiring reverse-thread security, such as rotating machinery, conveyor systems, and high-vibration equipment where standard right-hand threads might loosen. The zinc yellow-chromate plated steel construction provides exceptional corrosion resistance in industrial environments, while the Class 3A thread fit ensures precise mating with nuts and threaded components. With 150,000 psi tensile strength and full threading along the 2" length, these heavy-duty fasteners maintain integrity under extreme loads, making them ideal for structural applications, heavy equipment assembly, and maintenance operations where reliability cannot be compromised.

Specification Summary & Compliance

This 1/2"-13 UNC coarse thread fastener features precise Class 3A thread fit tolerances and complies with SAE J429 specifications for Grade 8 fasteners. The manufacturing process ensures dimensional accuracy with left-hand thread direction, external hex drive configuration (3/4" head width), and full threading along the 2" length. The zinc yellow-chromate plating provides corrosion protection while maintaining compliance with industrial standards for heavy-duty applications requiring 150,000 psi tensile strength and Rockwell C33 hardness performance characteristics.