S-94063A311 4-40 x 5/16" ASME B18.6.3 Tamper-Resistant Drilled Spanner Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under demanding loads.
• Rockwell B70 hardness provides excellent durability and resistance to wear and deformation.
• Drilled spanner drive design allows for secure tool engagement and easy installation in tight spaces.
• Class 2A thread fit offers consistent, precise threading for smooth assembly and reduced cross-threading risks.
• Full threading along the 5/16" length maximizes grip and holding power in various materials.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards for professional use.

Professional Applications & Engineering Value

These 4-40 UNC flat head screws are engineered to address common industrial challenges, such as corrosion and mechanical stress in fastening applications. Made from 18-8 stainless steel with a passivated finish, they resist rust and chemical exposure, making them ideal for machinery, electronics, and outdoor equipment. The drilled spanner drive ensures secure torque application, reducing slippage in confined areas, while the coarse UNC threads and Class 2A fit provide quick, reliable installation. With a 70,000 psi tensile strength and full threading, these screws deliver consistent performance in industrial screws applications, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a Class 2A thread fit and standard UNC thread type with 4-40 size. It meets ASME B18.6.3 specifications for manufacturing consistency and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.