S-99904A138 3/8"-24 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through serrated locking technology that prevents loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in harsh environments
• High-strength performance meeting Grade 5 specifications, capable of withstanding significant mechanical stress
• Secure installation with external hex drive design providing reliable torque application and easy maintenance access
• Integrated flange design with 3/4" diameter distributing load evenly and eliminating need for separate washers
• Precision fine threading (3/8"-24 UNF) ensuring tight, secure connections in critical assembly applications
• Regulatory compliance with REACH and RoHS 3 standards for safe use across industrial sectors

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel flange lock nut delivers exceptional engineering value through its integrated serrated locking mechanism that actively counters vibration-induced loosening - a common failure point in machinery, automotive, and heavy equipment applications. The 3/8"-24 UNF fine thread configuration provides superior clamping force distribution while the external hex drive enables efficient installation in confined spaces. The 3/4" flange diameter significantly increases bearing surface area, reducing surface pressure and preventing damage to connected materials. Manufactured from zinc-plated steel, this nut maintains integrity in environments exposed to moisture and chemicals, making it ideal for outdoor equipment, industrial machinery, and transportation systems where reliability is paramount.

Specification Summary & Compliance

This flange lock nut features Class 2B thread fit tolerance for consistent engagement and UNF thread standards compatibility. The right-hand thread direction and fine thread spacing (24 TPI) ensure precise fastening control. Manufacturing complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental directives, confirming suitability for industrial applications requiring regulatory compliance. The nut maintains Grade 5 strength classification throughout its zinc-plated steel construction.