S-90519A865 5/16"-24 ASTM A108 Hex Nuts

Key Features & Benefits at a Glance

• Left-hand threading provides secure fastening in applications where standard right-hand threads may loosen due to rotational forces
• Black-oxide steel construction offers enhanced corrosion resistance and durability in demanding industrial environments
• Thin profile design saves space and weight while maintaining full functionality in compact assemblies
• Fine thread spacing (24 TPI) ensures superior vibration resistance and precise adjustment capabilities
• Grade 2 strength classification delivers reliable performance for medium-duty applications
• Class 2B thread fit guarantees smooth assembly and consistent torque performance
• External hex drive enables easy installation and removal with standard wrenching tools

Professional Applications & Engineering Value

This 5/16"-24 UNF thin hex nut with left-hand threading addresses critical engineering challenges in rotating machinery and specialized equipment where reverse-thread applications prevent unintended loosening. The black-oxide steel surface treatment provides essential corrosion protection while maintaining dimensional stability, making it ideal for automotive, manufacturing, and maintenance applications. The fine thread spacing combined with Class 2B thread fit ensures precise clamping force distribution and excellent vibration resistance, solving common issues of fastener back-off in high-vibration environments. Manufactured to ASTM A108 specifications, this thin hex nut offers reliable performance where space constraints demand a low-profile solution without compromising strength or functionality.

Specification Summary & Compliance

This fastener meets ASTM A108 material standards with Grade 2 strength classification. Thread specifications include 5/16"-24 UNF fine thread with left-hand direction and Class 2B thread fit tolerance. Dimensions measure 1/2" width and 3/16" height. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.