S-90640A340 7/8"-9 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking technology, preventing loosening in high-motion environments
• Reusable locking performance allows for multiple installations without compromising secure fastening capability
• High-temperature resilience with nylon insert rated for continuous operation up to 220°F (104°C)
• Enhanced corrosion protection from zinc plating, extending service life in industrial conditions
• Precision thread engagement with Class 2B fit ensuring reliable mating with male threads
• Standard hex profile for compatibility with common wrenching tools and efficient installation
• Environmental compliance meeting RoHS 3 and REACH standards for responsible manufacturing

Professional Applications & Engineering Value

This 7/8"-9 UNC nylon insert locknut delivers critical vibration resistance where traditional fasteners fail. The zinc-plated steel construction provides durable corrosion protection while the nylon insert creates consistent friction against mating threads, maintaining clamp force under extreme vibration. Engineered with coarse UNC threads and Class 2B thread fit, it ensures reliable engagement in heavy machinery, automotive assemblies, and structural applications where thermal cycling and dynamic loads demand secure, reusable fastening solutions that withstand temperatures to 220°F.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2B thread fit and UNC coarse thread specifications (7/8"-9). Features standard hex profile (1 1/4" width, 63/64" height) with external drive style and right-hand thread direction. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.