S-91831A144 5/8"-11 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 provided by 18-8 stainless steel construction for extended service life in harsh conditions
• Reliable high-temperature performance with nylon insert rated up to 220°F (104°C) for demanding industrial applications
• Precise thread engagement with Class 2B thread fit ensuring consistent, reliable installation and removal
• Easy installation and removal using standard wrench tools thanks to the external hex drive design
• Optimal thread compatibility with UNC coarse 5/8"-11 threads for robust connections in various assemblies
• Full regulatory compliance meeting RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

This 5/8"-11 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 outdoor equipment, marine applications, and chemical processing environments where moisture and corrosive elements are present. The nylon insert locking mechanism creates consistent friction against mating threads, effectively resisting rotational forces without damaging threads during repeated installations. The UNC coarse threads with Class 2B fit ensure reliable engagement with standard bolts while accommodating minor misalignments in assembly. With its 220°F maximum temperature rating, this locknut maintains performance in engine compartments, industrial machinery, and other thermally challenging applications where thermal cycling occurs.

Specification Summary & Compliance

This heavy-duty locknut features precision UNC 5/8"-11 coarse threads with Class 2B thread fit for consistent engagement and reliable performance. The external hex drive measures 15/16" across flats with a 3/4" height profile. Manufactured from 18-8 stainless steel with a nylon insert locking element, the component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial and commercial applications worldwide.