S-90949A225 1/4"-28 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread locking technology that maintains clamp force in high-motion environments
• Enhanced corrosion protection with black-oxide steel finish for extended service life in demanding industrial conditions
• Integrated flange design with 9/16" diameter distributes load evenly and eliminates need for separate washers
• Precision UNF fine threading (1/4"-28) with Class 2B fit ensures reliable engagement and consistent torque performance
• Grade G strength classification provides dependable mechanical properties for critical fastening applications
• External hex drive enables easy installation with standard tools while maintaining secure locking function
• Regulatory compliance with REACH and RoHS 3 standards meets international environmental and safety requirements

Professional Applications & Engineering Value

This flange lock nut combines distorted thread locking technology with an integrated black-oxide steel construction to solve critical vibration-induced loosening problems in industrial machinery, automotive assemblies, and heavy equipment. The 9/16" flange diameter provides superior bearing surface distribution, preventing surface damage while eliminating the cost and complexity of separate washers. Engineered with UNF fine threading and Class 2B thread fit, this fastener delivers precise engagement and consistent clamping force in applications where vibration resistance and reliability are paramount. The Grade G material specification ensures mechanical integrity under dynamic loads, making it ideal for manufacturing, transportation, and industrial maintenance applications requiring durable, maintenance-free fastening solutions.

Specification Summary & Compliance

This 1/4"-28 UNF flange lock nut features Class 2B thread fit precision and right-hand thread direction with standard external hex drive. Manufactured to industry standards with 9/16" flange diameter and 0.04" flange thickness. Fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring safe use across global industrial markets.