S-91831A034 9/16"-12 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance with nylon insert locking mechanism that maintains secure fastening under dynamic loads
• Excellent corrosion resistance provided by 18-8 stainless steel construction for extended service life in harsh environments
• High-temperature performance with nylon insert rated for continuous operation up to 220°F (104°C)
• Precise thread engagement with Class 2B thread fit ensuring reliable installation and consistent clamping force
• Easy installation and removal with standard external hex drive design compatible with common wrench tools
• Coarse thread advantage with UNC 9/16"-12 configuration providing quick assembly and reduced cross-threading risk
• Regulatory compliance meeting RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

This 9/16"-12 UNC nylon insert locknut delivers critical vibration resistance in demanding industrial applications where loosening under dynamic loads poses significant safety and performance risks. Engineered from 18-8 stainless steel, the locknut provides exceptional corrosion resistance for outdoor equipment, marine applications, and chemical processing environments. The nylon insert locking mechanism creates consistent friction against mating threads, maintaining clamp load without damaging threads during installation or removal. With its coarse thread design and Class 2B thread fit, this fastener ensures reliable performance in automotive assemblies, heavy machinery, construction equipment, and transportation systems where vibration-induced failure must be prevented. The external hex drive allows for standard tool compatibility while the temperature-rated nylon insert maintains locking integrity across industrial operating conditions.

Specification Summary & Compliance

This locknut features 9/16"-12 UNC coarse threads with Class 2B thread fit precision manufacturing standards. The standard hex profile measures 7/8" across flats with a height of 41/64". Manufactured from 18-8 stainless steel with right-hand thread direction and nylon insert locking rated to 220°F maximum temperature. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications.