S-91831A040 1 1/4"-7 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking mechanism that maintains secure fastening in high-motion environments
• Excellent corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial conditions
• High-temperature performance with nylon insert rated up to 220°F for reliable operation in thermal applications
• Precise thread engagement with Class 2B thread fit ensuring consistent, reliable connections
• Easy installation and removal with standard external hex drive design compatible with common tools
• Coarse UNC threading provides faster assembly and reduced cross-threading risk in industrial settings
• Environmental compliance meeting RoHS 3 and REACH standards for global manufacturing applications

Professional Applications & Engineering Value

This 1 1/4"-7 UNC nylon insert locknut delivers critical vibration resistance for demanding industrial applications where loosening under dynamic loads poses significant safety and performance risks. The 18-8 stainless steel construction provides exceptional corrosion resistance, making it ideal for chemical processing, marine environments, and outdoor equipment exposed to moisture. The nylon insert locking mechanism creates consistent friction against mating threads, maintaining clamp force without damaging threads during repeated installations. With its coarse UNC thread pattern and Class 2B thread fit, this locknut ensures rapid assembly in manufacturing lines while providing reliable performance in heavy machinery, transportation equipment, and structural applications where vibration-induced failure is not an option.

Specification Summary & Compliance

This locknut features 1 1/4"-7 UNC coarse threading with Class 2B thread fit for precise dimensional accuracy and reliable engagement. The external hex drive design accommodates standard wrenching tools, while the right-hand thread direction follows conventional installation practices. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring suitability for regulated industrial applications worldwide. The nylon insert maintains locking performance up to 220°F maximum temperature, with dimensional specifications of 1 13/16" width and 1 25/64" height for consistent fitment.