S-90519A882 7/8"-20 ASTM A108 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional corrosion resistance through black-oxide steel construction, extending service life in harsh industrial environments
• Superior vibration resistance with extra fine UNEF thread spacing, maintaining secure connections in high-vibration applications
• Precise thread engagement with Class 2B fit, ensuring reliable assembly and reducing cross-threading risks
• Space-saving thin profile (31/64" height) ideal for applications with limited clearance while maintaining full strength
• Left-hand thread compatibility for specialized applications requiring reverse-direction security
• Regulatory compliance assurance with RoHS 3 and REACH compliance, meeting international environmental standards
• Consistent performance through ASTM A108 material specification and Grade 2 strength classification

Professional Applications & Engineering Value

This 7/8"-20 UNEF left-hand thin hex nut delivers critical engineering solutions where standard fasteners fall short. The black-oxide steel construction provides superior corrosion protection without compromising structural integrity, making it ideal for machinery, automotive, and industrial equipment exposed to moisture and chemicals. The extra fine thread spacing offers enhanced vibration resistance in dynamic applications, while the thin profile accommodates space-constrained assemblies without sacrificing performance. Engineered with left-hand threading, this fastener addresses specialized requirements in rotating equipment where reverse-direction threads prevent loosening under normal operational torque. The combination of Class 2B thread fit and ASTM A108 compliance ensures consistent quality and reliable performance in demanding B2B applications.

Specification Summary & Compliance

This hex nut features precision 7/8"-20 UNEF extra fine threads with Class 2B fit tolerances, manufactured to ASTM A108 specifications with Grade 2 strength classification. Dimensions include 1 5/16" width and 31/64" height thin profile. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility while maintaining optimal performance characteristics for industrial fastener applications.