S-90738A120 5/16"-18 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional strength and reliability with Grade 5 classification, ensuring dependable performance in demanding industrial applications.
• Superior corrosion resistance provided by the zinc-plated steel finish, extending the fastener's service life in harsh environments.
• Secure and precise fit due to the Class 2B thread fit, offering excellent engagement with mating components for vibration resistance.
• Easy installation and removal with the standard external hex drive profile, compatible with common wrenches for efficient maintenance.
• Reliable performance in specialized assemblies using the left-hand thread direction, preventing loosening in rotating machinery with counter-clockwise motion.
• Broad compatibility with the 5/16"-18 UNC coarse thread, designed for quick assembly and robust connections in inch-system applications.
• Compliance with environmental and safety standards including RoHS 3 and REACH, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel hex nut is engineered to address critical challenges in heavy-duty and high-vibration environments. The left-hand UNC coarse thread is specifically designed for applications where standard right-hand threads may loosen under counter-clockwise rotational forces, such as in certain machinery, automotive, and equipment assemblies. The zinc-plated steel construction provides a durable barrier against corrosion, significantly reducing maintenance needs and downtime in industrial settings. With its Class 2B thread fit and external hex drive, this nut ensures easy installation and a secure, reliable hold, making it an ideal choice for construction, manufacturing, and MRO applications that demand consistent performance and long-term durability.

Specification Summary & Compliance

This hex nut features a 5/16"-18 UNC coarse thread with a Class 2B thread fit for precise dimensional accuracy and reliable mating. Manufactured from zinc-plated steel with a standard hex profile, it measures 1/2" in width and 17/64" in height. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial fasteners.