S-90317A718 M5 x 20 mm ASME B18.13.1M Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with an integrated internal-tooth lock washer that maintains tight, secure connections in high-motion environments
• Excellent corrosion resistance thanks to the passivated 18-8 stainless steel construction, ideal for harsh or humid industrial settings
• High tensile strength and durability with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under heavy loads
• Secure and precise fastening ensured by Class 6g thread fit and fully threaded M5 coarse thread design for easy installation and strong hold
• Easy installation and removal with a standard Phillips No. 2 drive and rounded pan head that reduces cam-out and improves torque application
• Long-term reliability from the 410 stainless steel lock washer, which provides consistent locking action without galling or seizing
• Broad compatibility and compliance meeting ASME B18.13.1M standards and RoHS/REACH regulations for safe, quality-assured use

Professional Applications & Engineering Value

These M5 metric screws with internal-tooth lock washers are engineered to address common industrial challenges such as vibration-induced loosening and corrosion in demanding environments. The 18-8 stainless steel body, combined with a passivated finish, provides robust protection against rust and chemical exposure, making them suitable for machinery, automotive assemblies, and outdoor equipment. The coarse 0.8mm pitch and fully threaded design ensure quick, secure engagement in various materials, while the Phillips drive and rounded pan head facilitate efficient installation with standard tools. Ideal for applications requiring repeated disassembly, these screws deliver consistent vibration-resistant performance, reducing maintenance needs and enhancing operational safety in industrial fastening systems.

Specification Summary & Compliance

This screw features precise Class 6g thread fit and metric coarse threading (M5 x 0.8mm) with a length of 20mm, ensuring dimensional accuracy per ASME B18.13.1M specifications. The assembly includes a lock washer made from 410 stainless steel with a passivated finish, complementing the screw's corrosion resistance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms adherence to environmental and safety standards, supporting use in regulated industries.