S-91831A037 7/8"-9 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert technology, preventing loosening under dynamic loads
• Excellent corrosion resistance with 18-8 stainless steel construction for long-term durability in harsh environments
• Reliable high-temperature performance maintaining locking integrity up to 220°F (104°C)
• Quick installation and removal with standard external hex drive design for efficient maintenance
• Precise thread engagement with Class 2B thread fit ensuring consistent, reliable fastening
• Industry-standard compatibility with UNC coarse threads for broad application across equipment and machinery
• Environmental compliance meeting RoHS 3 and REACH standards for safe industrial use

Professional Applications & Engineering Value

This nylon insert locknut delivers critical vibration resistance where conventional fasteners fail. The 18-8 stainless steel construction provides exceptional corrosion resistance, making it ideal for marine, chemical processing, and outdoor equipment applications. The UNC coarse thread design ensures rapid assembly in high-volume production environments while maintaining secure connections. Engineered with a Class 2B thread fit, this external hex locknut offers consistent torque performance and prevents cross-threading during installation. The nylon insert creates permanent friction locking that outperforms mechanical lockwashers, eliminating the need for secondary locking mechanisms in heavy machinery, conveyor systems, and automotive assemblies where vibration-induced loosening poses significant safety risks.

Specification Summary & Compliance

This locknut features 7/8"-9 UNC coarse threads with Class 2B thread fit for precise dimensional accuracy. The external hex drive measures 1 1/4" across flats with a 63/64" height profile. Manufactured from 18-8 stainless steel with right-hand threading and nylon insert locking technology rated to 220°F maximum temperature. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial fastener applications.