S-91030A031 3/8"-16 Flange Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel coating, extending service life in harsh industrial environments
• Enhanced load distribution thanks to the 7/8" flange diameter, reducing surface pressure and preventing material damage
• Reliable coarse thread engagement with UNC 3/8"-16 specification, ensuring quick assembly and vibration resistance
• Precise Class 2B thread fit for consistent mating with male threads, minimizing cross-threading risks
• Standard hex profile with external drive for universal tool compatibility and high-torque installation capability
• Right-hand thread design for intuitive installation in standard industrial applications
• Environmental compliance assurance with RoHS 3 certification, meeting strict regulatory requirements

Professional Applications & Engineering Value

This black-oxide steel flange nut delivers exceptional performance in demanding industrial applications where vibration resistance and corrosion protection are critical. The integrated 7/8" flange eliminates the need for separate washers, distributing clamp load over a wider area to prevent surface damage on assembled components. Manufactured with UNC coarse threads and Class 2B thread fit, this hex flange nut ensures reliable engagement even in high-vibration environments like machinery, automotive assemblies, and structural frameworks. The black-oxide surface treatment provides durable protection against oxidation while maintaining consistent torque values during installation. Engineered for heavy-duty fastening requirements, this nut offers superior staying power in applications where loosening could compromise system integrity.

Specification Summary & Compliance

This flange nut features 3/8"-16 UNC coarse threads with Class 2B thread fit for precise dimensional accuracy according to industry standards. The external hex drive measures 11/16" across flats with a 1/2" height profile. The flange diameter is 7/8" with 0.13" thickness. Manufactured from steel with black-oxide coating, this product is RoHS 3 (2015/863/EU) compliant with exemption 6(a) for lead as an alloying element in steel, meeting environmental regulations for industrial components.