S-90317A406 M2.5 x 8 mm ASME B18.13.1M Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated external-tooth lock washer that maintains clamping force in high-stress environments
• Excellent corrosion protection through passivated 18-8 stainless steel construction for extended service life in harsh conditions
• Reliable installation performance with Phillips No. 1 drive design ensuring secure torque transfer and reduced cam-out risk
• Optimized thread engagement with Class 6g coarse threads providing quick assembly and consistent fastening performance
• Enhanced mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Secure locking action from 410 stainless steel washer that prevents loosening under dynamic loads
• Industry-standard compatibility with pan head profile and fully threaded design for broad application versatility

Professional Applications & Engineering Value

These M2.5 metric screws with external-tooth lock washers address critical vibration-induced loosening challenges in industrial equipment, electronics assembly, and machinery applications. The combination of 18-8 stainless steel construction and passivated finish provides exceptional corrosion resistance for environments exposed to moisture, chemicals, or outdoor conditions. The coarse thread pitch (0.45mm) ensures rapid installation and reliable performance in materials where fine threads might strip or fail. The pan head design with Phillips drive offers a low-profile fastening solution that accommodates standard driving tools while the integrated locking mechanism maintains joint integrity through thermal cycling and mechanical shock. This engineered fastener system delivers predictable, repeatable performance for OEMs and maintenance teams requiring dependable vibration-resistant solutions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 6g thread fit tolerance and full compliance with ASME B18.13.1M specifications. The complete assembly meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Threading is fully formed to metric coarse thread standards with M2.5 diameter and 0.45mm pitch. The locking system incorporates a 410 stainless steel external-tooth lock washer with 5.5mm OD and 0.45mm thickness, complementing the 18-8 stainless steel screw material with matching passivated finish for uniform corrosion protection.