S-95345A444 4-40 x 3/4" ASME B18.13 Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Key Features & Benefits at a Glance

• Vibration-resistant fastening with integrated external-tooth lock washer prevents loosening in dynamic industrial environments
• Superior corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life
• High tensile strength of 70,000 psi ensures reliable performance under demanding mechanical loads
• Quick installation and removal with No. 1 Phillips drive and coarse UNC threading for efficient assembly operations
• Secure washer integration featuring 410 stainless steel construction that maintains locking capability in corrosive environments
• Precision thread fit (Class 2A) provides consistent engagement and reliable clamping force in mating components
• Full threading along 3/4" length offers maximum adjustability and holding power throughout the entire fastener

Professional Applications & Engineering Value

These 4-40 UNC rounded head Phillips screws with integrated lock washers address critical vibration-induced loosening challenges in industrial assemblies. The combination of 18-8 stainless steel material and passivated finish provides exceptional corrosion resistance for harsh operating environments, while the external-tooth lock washer bites into both the screw head and mounting surface to create permanent anti-rotation security. The coarse thread design ensures rapid installation in various materials, and the fully threaded configuration maximizes engagement depth. These features make these pan head screws ideal for machinery, electronic enclosures, and equipment where vibration resistance and corrosion protection are paramount for long-term reliability.

Specification Summary & Compliance

This fastener features precision UNC coarse threads with Class 2A fit tolerance for consistent performance. Manufactured in compliance with ASME B18.13 specifications, these screws meet rigorous industry standards for dimensional accuracy and mechanical properties. The product is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental responsibility and regulatory adherence for global industrial applications.