S-99851A102 6-32 MS21046C06, NASM21046 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through flex-top locking design that maintains secure fastening in high-motion environments
• Exceptional corrosion protection with silver-plated 18-8 stainless steel construction for extended service life
• Precise thread engagement with Class 3B fit UNC coarse threads ensuring reliable installation and removal
• Industry-standard compliance meeting MS21046C06 and NASM21046 specifications for aerospace and industrial applications
• Optimized torque transmission through external hex drive design for efficient installation with standard tools
• Environmental regulation compliance with RoHS 3 and REACH standards for global manufacturing acceptance
• Dimensional consistency with 5/16" width and 11/64" height for reliable interchangeability in assembly operations

Professional Applications & Engineering Value

This 6-32 flex-top locknut delivers critical vibration resistance where conventional fasteners fail. Engineered with a flex-top locking mechanism that creates consistent friction against mating threads, it prevents loosening under extreme dynamic loads. The silver-plated 18-8 stainless steel construction provides dual protection: the base material offers excellent corrosion resistance while the silver plating enhances conductivity and provides additional environmental protection. With UNC coarse threads and Class 3B fit, these locknuts ensure precise engagement in automotive, aerospace, and heavy machinery applications where vibration-induced failure is a primary concern. The compliance with MS21046C06 and NASM21046 standards guarantees consistent performance in regulated industries, making them ideal for critical assemblies requiring dependable locking solutions.

Specification Summary & Compliance

This locknut features 6-32 UNC coarse threads with Class 3B thread fit for precision engagement, manufactured to MS21046C06 and NASM21046 specifications. The external hex drive style accommodates standard installation tools, while the flex-top locking mechanism provides reliable vibration resistance. Dimensions include 5/16" width across flats and 11/64" height. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for industrial fasteners.