S-90640A410 1 1/4"-7 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert technology that maintains locking force in high-motion environments
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding conditions
• High-temperature performance with nylon insert rated to 220°F (104°C) for thermal stability in industrial applications
• Reliable thread engagement with Class 2B thread fit ensuring consistent installation and removal without galling
• Quick installation capability using standard wrench tools thanks to external hex drive design
• Secure fastening performance with coarse UNC threads providing excellent holding power in various materials
• Environmental compliance meeting RoHS 3 and REACH standards for global manufacturing requirements

Professional Applications & Engineering Value

This 1 1/4"-7 UNC nylon insert locknut delivers critical vibration resistance in demanding industrial environments where loosening under dynamic loads poses significant safety risks. The zinc-plated steel construction provides essential corrosion protection while maintaining the structural integrity required for heavy machinery, construction equipment, and transportation applications. The coarse thread design ensures rapid installation and superior holding power in softer materials or where frequent disassembly isn't required. With its 220°F temperature rating, this locknut performs reliably in engine compartments, industrial ovens, and other thermal cycling environments where standard nylon inserts would fail. The external hex drive allows for high-torque installation using common industrial tools, making it ideal for maintenance operations and production line applications requiring efficient assembly processes.

Specification Summary & Compliance

This heavy-duty locknut features 1 1/4"-7 UNC coarse threads with Class 2B thread fit for consistent engagement and reliable performance. The standard hex profile measures 1 13/16" across flats with a 1 25/64" height, providing substantial bearing surface for distributed load transfer. Manufactured to industrial fastener standards with right-hand threading and nylon insert locking technology. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global supply chains and environmentally conscious manufacturing operations.