S-98892A100 4-40 MS21043-04 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through precision distorted thread center lock technology that maintains secure fastening under extreme conditions
• Enhanced corrosion protection with silver-plated A286 stainless steel construction for extended service life in harsh environments
• Precision thread engagement with Class 3B thread fit ensuring reliable performance in critical applications
• Integrated flange design eliminates need for separate washers while providing superior load distribution
• Industry-standard compliance meeting MS21043-04 specifications for consistent quality and reliability
• Environmental regulation compliance with RoHS 3 and REACH standards for global market acceptance
• Optimized installation efficiency with standard external hex drive and coarse UNC threads for faster assembly

Professional Applications & Engineering Value

This silver-plated A286 stainless steel flange lock nut delivers exceptional performance in demanding environments where vibration resistance and corrosion protection are critical. The distorted thread center lock technology creates consistent prevailing torque that prevents loosening under dynamic loads, making it ideal for aerospace applications, industrial machinery, and high-vibration equipment. The 4-40 UNC coarse thread combined with Class 3B thread fit ensures precise engagement and reliable performance in critical assemblies. The integrated flange provides superior bearing surface distribution, reducing stress concentrations while eliminating the need for additional washers. The silver plating on A286 stainless steel offers excellent galvanic compatibility and enhanced corrosion resistance, particularly valuable in aerospace and marine environments where material compatibility and long-term reliability are essential.

Specification Summary & Compliance

This flange lock nut features precise 4-40 UNC Class 3B threads with coarse thread spacing and right-hand thread direction. The nut maintains MS21043-04 specifications with a 5/32" width, 1/8" height, 0.206" flange diameter, and 0.03" flange thickness. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring global regulatory compliance for hazardous substance restrictions. The external hex drive style and standard hex nut profile facilitate efficient installation while maintaining the distorted thread locking mechanism's integrity throughout the product lifecycle.