S-91831A140 1/2"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert technology that maintains secure locking even under dynamic loads
• Excellent corrosion resistance provided by 18-8 stainless steel construction for long-term reliability in harsh environments
• High-temperature performance with nylon insert rated up to 220°F for thermal stability in demanding applications
• Precision thread engagement with Class 2B fit ensuring consistent, reliable fastening without cross-threading
• Industry-standard compatibility with UNF fine thread (1/2"-20) specifications for seamless integration
• Easy installation and removal using standard wrench tools thanks to external hex drive design
• Environmental compliance meeting RoHS 3 and REACH regulations for global industrial use

Professional Applications & Engineering Value

This 18-8 stainless steel nylon insert locknut delivers exceptional engineering value in applications where vibration-induced loosening poses significant reliability concerns. The nylon insert locking mechanism creates consistent friction against mating threads, effectively dampening vibrational energy that would otherwise compromise fastener integrity. The UNF fine thread configuration (1/2"-20) provides superior thread engagement compared to coarse threads, distributing load more evenly across thread surfaces. Manufactured from corrosion-resistant 18-8 stainless steel, this hex locknut maintains structural integrity in moist, chemical, or outdoor environments where carbon steel fasteners would deteriorate. The combination of external hex drive and standard hex nut profile ensures compatibility with common installation tools while providing sufficient torque capability for secure fastening in automotive, machinery, and industrial equipment applications.

Specification Summary & Compliance

This locknut features Class 2B thread fit per UNF standards, ensuring precise dimensional accuracy and reliable thread engagement. The 1/2"-20 UNF fine thread specification follows established industrial threading standards for consistent performance. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental responsibility and chemical safety. Physical dimensions include 3/4" width across flats and 19/32" height for standardized installation. The right-hand thread direction and external hex drive style align with conventional industrial fastening practices for straightforward implementation across various mechanical systems.