S-90519A888 1 1/4"-7 ASTM A108 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced corrosion protection through black-oxide steel coating, extending service life in demanding environments
• Secure left-hand thread engagement prevents unintentional loosening in counter-rotating applications
• Space-saving thin profile (23/32" height) enables installation in confined areas without compromising strength
• Precise Class 2B thread fit ensures smooth assembly and reliable vibration resistance
• Heavy-duty Grade 2 strength provides dependable load-bearing capacity for industrial applications
• Standardized UNC coarse threading (1 1/4"-7) facilitates quick installation and replacement
• Full regulatory compliance with RoHS 3 and REACH standards for global supply chain integration

Professional Applications & Engineering Value

This left-hand thread hex nut addresses critical reverse-rotation challenges in machinery, conveyor systems, and rotating equipment where standard right-hand threads would loosen under operational stress. The black-oxide steel construction provides superior corrosion resistance compared to plain steel, significantly reducing maintenance frequency in humid or chemically aggressive environments. Engineered with ASTM A108 compliance and coarse UNC threading, this thin-profile fastener maintains structural integrity while enabling rapid installation in space-constrained assemblies. The combination of Grade 2 strength classification and Class 2B thread fit ensures consistent performance in high-vibration applications across manufacturing, automotive, and heavy equipment sectors.

Specification Summary & Compliance

This hex nut features precise Class 2B thread fit with 1 1/4"-7 UNC coarse threading in left-hand direction. Manufactured to ASTM A108 specifications with dimensional accuracy of 1 7/8" width and 23/32" height. Fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance.