S-91030A440 1/2"-20 Flange Nuts

Key Features & Benefits at a Glance

• Enhanced corrosion protection with black-oxide steel finish, ideal for harsh industrial environments
• Superior load distribution thanks to the 1 1/8" flange diameter, reducing surface pressure and material stress
• Reliable fine thread engagement with 1/2"-20 UNF Class 2B fit, ensuring vibration resistance and secure fastening
• Easy installation and removal using standard 7/8" external hex drive, compatible with common tools
• Durable construction from high-strength steel, providing long-term performance in heavy-duty applications
• Regulatory compliance with RoHS 3 standards, meeting environmental and safety requirements for industrial use
• Versatile right-hand threading for standard assembly processes across various machinery and equipment

Professional Applications & Engineering Value

This black-oxide steel flange nut is engineered to address common industrial challenges such as vibration loosening and corrosion-induced failure. The UNF fine thread (1/2"-20) with Class 2B fit ensures precise, tight engagement that maintains integrity under dynamic loads, making it ideal for automotive, machinery, and structural assemblies. The integrated 1 1/8" flange eliminates the need for separate washers, distributing clamp force evenly to prevent damage to soft materials. Its external hex drive allows for high-torque installation with standard wrenches, streamlining maintenance and reducing assembly time in production lines.

Specification Summary & Compliance

This flange nut adheres to UNF fine thread standards with Class 2B thread fit for consistent dimensional accuracy. Key specifications include a flange diameter of 1 1/8", height of 11/16", and width of 7/8". It is manufactured from black-oxide coated steel and complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel, ensuring environmental and regulatory conformity for industrial applications.