S-90317A103 M2.5 x 5 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 through the integrated internal-tooth lock washer, preventing loosening in dynamic applications
• Excellent corrosion resistance with 18-8 stainless steel construction and passivated finish for long service life in harsh environments
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under load
• Secure fastening engagement with Class 6g thread fit and coarse thread pitch for quick assembly and stable connections
• Optimized drive efficiency featuring Phillips No. 1 drive for controlled torque application and reduced cam-out risk
• Enhanced load distribution through the pan head design with integrated washer, minimizing surface damage
• Full thread coverage along the 5mm length ensures maximum grip strength throughout the engagement area

Professional Applications & Engineering Value

These M2.5 metric screws with internal-tooth lock washers provide critical vibration-resistant fastening solutions for industrial equipment, electronic enclosures, and precision machinery. The combination of 18-8 stainless steel material and passivated finish ensures reliable performance in corrosive environments where standard fasteners would fail. The coarse thread pitch (0.45mm) enables rapid installation while maintaining secure connections, particularly valuable in high-volume assembly operations. The Phillips drive system offers familiar, efficient installation with standard tools, while the pan head design with integrated washer provides superior clamping force distribution. These features collectively address common industrial challenges including vibration-induced loosening, corrosion-related failures, and installation efficiency demands in rounded head screw applications.

Specification Summary & Compliance

This metric screw features M2.5 diameter with 0.45mm coarse pitch threads manufactured to Class 6g tolerance for precise fit. The fully threaded 5mm length ensures complete engagement capability. Manufacturing complies with ASME B18.13.1M specifications for dimensional accuracy and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming suitability for regulated industries and international markets. The companion 410 stainless steel lock washer with passivated finish provides complementary corrosion resistance and mechanical properties.