S-99904A101 1/4"-20 Flange Nuts

Key Features & Benefits at a Glance

• Vibration-resistant locking with serrated flange design prevents loosening under dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction for extended service life
• High-strength Grade 5 rating ensures reliable performance in demanding applications
• Quick installation with standard external hex drive and coarse UNC threads
• Superior load distribution from 19/32" flange diameter reduces surface pressure
• Precision Class 2B thread fit provides consistent engagement and reliable fastening
• Environmental compliance with RoHS 3 and REACH regulations for global industrial use

Professional Applications & Engineering Value

This Grade 5 serrated flange lock nut delivers critical vibration resistance where conventional fasteners fail. The zinc-plated steel construction provides durable corrosion protection in harsh environments, while the UNC coarse threads enable rapid assembly without compromising strength. The serrated locking flange bites into mating surfaces, creating permanent resistance to rotational loosening from machinery vibration, transportation equipment, or structural dynamics. Engineered for industrial applications requiring reliable, maintenance-free fastening, this external hex flange nut combines high Grade 5 strength with positive locking action to eliminate the need for secondary locking devices, reducing assembly time and improving system reliability.

Specification Summary & Compliance

This flange lock nut features 1/4"-20 UNC coarse threads with Class 2B thread fit for consistent engagement. Manufactured to Grade 5 strength standards with right-hand threading and standard hex profile (7/16" width). The 19/32" flange diameter with 0.04" thickness provides optimal load distribution. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.