S-91030A425 5/16"-24 Flange Nuts

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel coating, extending service life in harsh industrial environments.
• Integrated flange design with 3/4" diameter distributes load evenly, reducing surface damage and eliminating the need for separate washers.
• Precise Class 2B thread fit ensures smooth, reliable engagement with mating components, minimizing cross-threading risks.
• UNF fine threading (5/16"-24) provides superior vibration resistance and secure fastening in high-stress applications.
• Standard external hex drive allows for easy installation and removal with common tools, improving assembly efficiency.
• RoHS 3 compliance meets environmental regulations, making it suitable for global industrial supply chains.
• Robust steel construction delivers high tensile strength and durability for heavy-duty fastening requirements.

Professional Applications & Engineering Value

This 5/16"-24 UNF flange nut is engineered to address common industrial challenges such as vibration loosening and corrosion-induced failure. The black-oxide steel finish provides a protective layer that resists rust and wear, making it ideal for automotive assemblies, machinery, and outdoor equipment where moisture or chemicals are present. The integrated flange acts as a built-in washer, increasing bearing surface area to prevent pull-through and distribute clamping force effectively. Combined with UNF fine threads, it maintains tightness under dynamic loads, reducing maintenance needs and downtime in production lines. Its external hex drive ensures compatibility with standard wrenches, streamlining installation in confined spaces.

Specification Summary & Compliance

This flange nut adheres to Class 2B thread tolerances for consistent fit and performance. It features a UNF fine thread (5/16"-24) with right-hand direction, a flange diameter of 3/4", and a height of 3/8". Manufactured from high-strength steel with a black-oxide surface treatment, it complies with RoHS 3 (2015/863/EU) standards, including exemption 6(a) for lead as an alloying element in steel, ensuring suitability for regulated industrial and engineering applications.