S-95345A611 2-56 x 5/16" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Key Features & Benefits at a Glance

• Enhanced Vibration Resistance: Integrated internal-tooth lock washer in 410 stainless steel prevents loosening under dynamic loads, ensuring long-term joint integrity.
• Superior Corrosion Protection: Constructed from 18-8 Stainless Steel with a passivated finish for excellent resistance to rust and oxidation in harsh environments.
• High-Strength Fastening: Delivers a reliable 70,000 psi tensile strength for robust, durable connections in demanding applications.
• Optimized Drive Engagement: Phillips No. 1 drive provides efficient torque transfer and reduces the risk of cam-out during installation.
• Wide Compatibility & Easy Assembly: Coarse UNC 2-56 threads with a Class 2A fit offer quick, easy starts and reliable engagement in a variety of materials.
• Secure, One-Piece Assembly: The pre-assembled lock washer system eliminates the need for separate components, speeding up installation and reducing inventory complexity.
• Regulatory Peace of Mind: Compliant with ASME B18.13, RoHS 3, and REACH, ensuring adherence to industry and environmental standards.

Professional Applications & Engineering Value

This 2-56 UNC Rounded Head Phillips screw is engineered to solve critical challenges in industrial assembly, particularly where vibration and corrosion are concerns. The combination of 18-8 Stainless Steel and a passivated finish provides a durable barrier against corrosive elements, making it ideal for electronics enclosures, machinery panels, and outdoor equipment. The integrated internal-tooth lock washer, made from 410 Stainless Steel, bites into the bearing surface to maintain clamp load, preventing spontaneous loosening in high-vibration environments like motors, conveyors, and automotive subsystems. The coarse thread and Class 2A fit ensure rapid, reliable installation in both metallic and non-metallic materials, reducing assembly time and improving production line efficiency.

Specification Summary & Compliance

This screw features a 2-56 UNC coarse thread with a Class 2A thread fit for standard tolerance and interchangeability. It is fully threaded and manufactured in compliance with the ASME B18.13 specification. The assembly is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant as of the latest substance review, ensuring it meets stringent environmental and safety regulations for global industrial use.