S-91831A039 1 1/8"-7 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking mechanism that maintains secure fastening in high-motion applications
• Excellent corrosion resistance provided by 18-8 stainless steel construction for extended service life in harsh environments
• High-temperature performance with nylon insert rated for temperatures up to 220°F (104°C) without compromising locking capability
• Easy installation and removal with standard external hex profile allowing for conventional wrenching tools
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance and reduced cross-threading risk
• Heavy-duty construction with 1 5/8" width and 1 11/64" height providing robust mechanical strength
• Regulatory compliance meeting RoHS 3 and REACH standards for environmental and safety requirements

Professional Applications & Engineering Value

This 1 1/8"-7 UNC nylon insert locknut delivers critical vibration resistance in demanding industrial applications where loosening under dynamic loads poses significant safety and performance risks. The 18-8 stainless steel construction provides inherent corrosion resistance, making it ideal for outdoor equipment, marine environments, and chemical processing facilities where moisture and corrosive elements are present. The coarse thread design with UNC specification ensures rapid installation and superior holding power in structural applications, while the nylon insert locking mechanism creates consistent friction that prevents back-off without damaging mating threads. Engineered for heavy machinery, automotive assemblies, and industrial equipment subjected to constant vibration, this external hex locknut combines installation convenience with reliable, long-term fastening security even in elevated temperature conditions up to 220°F.

Specification Summary & Compliance

This locknut features 1 1/8"-7 UNC coarse threads with Class 2B thread fit for consistent engagement and proper clearance. The right-hand thread direction follows standard industrial conventions. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. Physical dimensions include 1 5/8" width across flats and 1 11/64" height, providing substantial bearing surface for distributed load transfer.