S-91247A635 3/8"-16 x 2 3/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With 120,000 psi tensile strength, this screw provides reliable holding power for demanding applications, reducing the risk of fastener failure under high stress.
• Superior Corrosion Resistance – The zinc plating finish offers excellent protection against rust and corrosion, extending the service life in harsh industrial environments.
• High Hardness for Durability – Rockwell C25 hardness ensures the screw maintains its shape and thread integrity, preventing stripping and wear during repeated use.
• Coarse Thread Design – The UNC coarse thread allows for quick and easy installation, reducing assembly time and improving efficiency in production settings.
• Precision Thread Fit – Class 2A thread fit ensures consistent, secure fastening with standard nuts, minimizing loosening from vibrations.
• Partially Threaded Shank – Provides enhanced grip and shear strength where needed, making it ideal for applications requiring strong, stable connections.
• External Hex Drive – Enables straightforward installation with common tools, facilitating maintenance and reducing labor costs in assembly lines.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 5 hex head screw addresses critical challenges in machinery, construction, and automotive sectors where vibration resistance and high load capacity are essential. The steel material combined with zinc plating delivers robust corrosion protection, reducing maintenance frequency in corrosive environments. Its 3/8"-16 UNC coarse thread and partial threading enhance grip strength and prevent joint slippage, ensuring long-term reliability in structural assemblies. By meeting ASME B18.2.1 and SAE J429 standards, it guarantees dimensional accuracy and performance consistency, making it a trusted choice for engineers seeking durable, compliant fastening solutions that minimize downtime and operational costs.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit and UNC coarse thread specifications, ensuring compatibility with standard components. It complies with ASME B18.2.1 and SAE J429 for mechanical properties and manufacturing consistency. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for use in various global markets.