S-95345A436 4-40 x 7/16" ASME B18.13 Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Enhanced vibration resistance through the integrated 410 stainless steel external-tooth lock washer, preventing loosening in dynamic applications.
• High tensile strength of 70,000 psi ensures reliable performance under significant mechanical stress.
• Efficient installation with Phillips No. 1 drive and coarse UNC threads for quick, secure fastening.
• Consistent thread engagement due to Class 2A thread fit and fully threaded design for uniform load distribution.
• Broad compliance with ASME B18.13, RoHS 3, and REACH, meeting strict industrial and environmental standards.
• Secure locking mechanism from the external-tooth washer, maintaining clamp force without additional components.

Professional Applications & Engineering Value

This 4-40 UNC screw with an integrated external-tooth lock washer addresses critical challenges in industrial assembly, such as vibration-induced loosening and corrosion. Crafted from 18-8 stainless steel and featuring a passivated finish, it resists rust and chemical exposure, making it suitable for machinery, electronics, and outdoor equipment. The coarse thread and Phillips drive enable rapid installation, while the lock washer provides reliable retention in high-stress environments. Its fully threaded design ensures maximum grip in various materials, reducing the risk of joint failure and minimizing maintenance needs.

Specification Summary & Compliance

The screw adheres to Class 2A thread fit and UNC coarse thread standards for precise dimensional accuracy. It meets ASME B18.13 specifications for quality and performance, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industrial reliability.