S-91627A117 3/8"-16 Flange Nuts

Key Features & Benefits at a Glance

• Exceptional Load Distribution – The 3/4" flange diameter spreads clamping force over a wider area, reducing the risk of surface damage and loosening under vibration.
• Superior Corrosion Resistance – Zinc yellow-chromate plating provides a durable barrier against rust and environmental degradation, extending service life in harsh conditions.
• High-Strength Reliability – Manufactured to Grade 8 standards, this nut ensures dependable performance in high-stress and heavy-duty applications.
• Easy Installation & Removal – The standard external hex drive allows for straightforward tightening with common wrenches, improving assembly efficiency.
• Precise Thread Engagement – 3/8"-16 UNC coarse threads with a Class 2B fit offer consistent, reliable fastening with reduced cross-threading risk.
• Enhanced Durability – Made from plated steel, the nut maintains its integrity and clamping force through repeated use and exposure.
• Versatile Industrial Use – The combination of strength, corrosion protection, and a wide flange makes it suitable for machinery, automotive, and structural assemblies.

Professional Applications & Engineering Value

This Grade 8 flange nut is engineered to address common industrial challenges such as joint failure, corrosion-induced weakening, and inefficient assembly. The zinc yellow-chromate plated steel construction provides robust protection against moisture and chemicals, which is critical in outdoor or corrosive environments like automotive undercarriages, construction equipment, and marine applications. The 3/4" flange diameter acts as an integrated washer, distributing load evenly to prevent damage to softer materials and maintain clamp load under dynamic stresses. With 3/8"-16 UNC coarse threads and a Class 2B thread fit, it ensures quick, secure engagement—reducing installation time and the likelihood of stripping. This design is ideal for heavy-duty fastening where vibration resistance, high tensile strength, and long-term reliability are non-negotiable.

Specification Summary & Compliance

This flange nut adheres to UNC coarse thread standards with a Class 2B thread fit for consistent dimensional accuracy. It meets Grade 8 mechanical properties, ensuring high tensile strength and durability. The manufacturing process complies with industry specifications for hex nuts and flange nuts, and the zinc yellow-chromate finish is applied in line with RoHS and REACH directives for environmental safety. The product is suitable for use under ASME and other relevant engineering standards, providing assurance of quality and performance in professional applications.