S-99851A105 1/4"-28 MS21046C4, NASM21046 Locknuts
Locknuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance through Flex-Top locking technology that maintains secure fastening under dynamic loads
- Enhanced corrosion protection with silver-plated 18-8 stainless steel construction for extended service life in harsh environments
- Precision thread engagement with Class 3B fit ensuring reliable performance in critical applications
- Industry-standard compliance meeting both MS21046C4 and NASM21046 specifications for aerospace and defense applications
- Optimal torque transmission through external hex drive design for efficient installation and removal
- Environmental regulation compliance with RoHS 3 and REACH standards for global manufacturing applications
- Fine thread configuration (1/4"-28 UNF) providing superior clamping force and vibration resistance
Professional Applications & Engineering Value
This silver-plated 18-8 stainless steel locknut delivers exceptional engineering value through its specialized Flex-Top locking mechanism that addresses critical vibration-induced loosening in demanding industrial environments. The combination of fine UNF threads and Class 3B thread fit ensures maximum contact surface area and precise engagement, significantly reducing the risk of thread stripping and maintaining clamp load integrity. The silver plating on 18-8 stainless steel provides dual-layer corrosion protection while maintaining electrical conductivity, making it ideal for aerospace, defense, and precision machinery applications where reliability and compliance with MS21046C4 and NASM21046 specifications are mandatory. This engineered solution prevents costly downtime and maintenance in vibration-prone assemblies.
Specification Summary & Compliance
This precision locknut features 1/4"-28 UNF fine threads with Class 3B thread fit for superior engagement and meets stringent MS21046C4 and NASM21046 specifications. The external hex design (7/16" width) and standard profile (9/32" height) ensure compatibility with standard tools. Manufacturing compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental responsibility and global market acceptance for industrial and aerospace applications.
