S-91831A123 8-36 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert technology that maintains locking force under dynamic loads
• Excellent corrosion protection with 18-8 stainless steel construction for harsh industrial environments
• Reliable high-temperature performance with nylon insert rated up to 220°F (104°C)
• Precise thread engagement with Class 2B thread fit ensuring consistent torque and secure fastening
• Easy installation and removal with standard external hex drive design for standard wrench access
• Fine thread advantage with 8-36 UNF threads providing better tension control in thin materials
• Regulatory compliance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This 8-36 UNF nylon insert locknut delivers exceptional engineering value in applications where vibration-induced loosening poses significant reliability concerns. The 18-8 stainless steel construction provides inherent corrosion resistance, making it ideal for marine, chemical processing, and outdoor equipment where environmental factors degrade ordinary fasteners. The nylon insert locking mechanism creates consistent friction against mating threads, maintaining clamp load without damaging threads during repeated installations. With its fine UNF thread form and Class 2B thread fit, this locknut ensures precise engagement in automotive assemblies, electronic enclosures, and precision machinery where fine adjustment and reliable locking are critical. The external hex drive style accommodates standard tools while the compact 11/32" width and 15/64" height profile fits space-constrained applications.

Specification Summary & Compliance

This locknut features 8-36 UNF fine threads with Class 2B thread fit per Unified Thread Standard specifications, ensuring consistent engagement and torque performance. The standard hex nut profile measures 11/32" across flats with 15/64" height. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming absence of restricted substances. The nylon insert maintains locking effectiveness up to the specified maximum temperature of 220°F, with right-hand thread direction for standard applications.