S-99904A136 1/4"-28 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through serrated locking technology that prevents loosening under dynamic loads
• Excellent load distribution with 19/32" flange design that reduces surface pressure and prevents material damage
• High-strength performance meeting Grade 5 standards for demanding industrial applications
• Precise thread engagement with Class 2B fit and 1/4"-28 UNF fine threads ensuring reliable fastening
• Enhanced corrosion protection through zinc plating that extends service life in harsh environments
• Easy installation and removal with standard external hex drive profile compatible with common tools
• Regulatory compliance with RoHS 3 and REACH standards for safe use across various industries

Professional Applications & Engineering Value

This Grade 5 flange lock nut addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and heavy equipment. The zinc-plated steel construction provides durable corrosion resistance while maintaining high-strength characteristics essential for structural applications. The serrated locking mechanism creates permanent resistance to rotation, eliminating the need for additional locking devices. The 19/32" flange diameter distributes clamping force over a wider area, preventing surface damage to connected components. With 1/4"-28 UNF fine threads and Class 2B thread fit, this nut ensures precise engagement with mating fasteners, making it ideal for applications requiring repeated disassembly and reassembly without compromising thread integrity.

Specification Summary & Compliance

This flange lock nut features 1/4"-28 UNF fine threads with Class 2B thread fit for precise tolerance and reliable performance. The external hex drive with standard profile ensures compatibility with common wrench tools. Manufacturing complies with Grade 5 strength classification and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The right-hand thread direction and serrated locking type provide consistent performance across industrial applications requiring vibration resistance and secure fastening.