S-91831A155 7/8"-14 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking mechanism, preventing loosening in high-motion applications
• Excellent corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and outdoor use
• Reliable high-temperature performance with nylon insert rated up to 220°F (104°C) for thermal stability
• Precise thread engagement with Class 2B thread fit ensuring consistent torque and secure fastening
• Easy installation and removal with standard external hex drive design compatible with common tools
• Fine thread advantage with UNF 7/8"-14 threads providing better tension control and vibration resistance
• Regulatory compliance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This 7/8"-14 UNF nylon insert locknut delivers critical vibration resistance in demanding industrial environments where mechanical stability is paramount. The 18-8 stainless steel construction provides inherent corrosion resistance, making it suitable for marine applications, chemical processing equipment, and outdoor machinery exposed to weather elements. The nylon insert locking mechanism creates consistent friction against mating threads, effectively preventing back-off in high-vibration scenarios such as automotive assemblies, heavy machinery, and power transmission systems. With its fine thread configuration and Class 2B thread fit, this locknut maintains precise clamping force while accommodating thermal expansion in applications approaching its 220°F temperature rating. The external hex design ensures compatibility with standard wrenching tools for efficient installation and maintenance cycles.

Specification Summary & Compliance

This heavy-duty locknut features 7/8"-14 UNF fine threads with Class 2B thread fit for precision engagement, measuring 1 1/4" across flats and 63/64" in height. Manufactured from 18-8 stainless steel with right-hand thread direction and external hex drive. The nylon insert provides reliable locking performance up to 220°F maximum temperature. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and chemical restriction adherence for industrial distribution.