S-90317A598 M5 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 through integrated external-tooth lock washer that maintains secure fastening in high-motion environments
• Excellent corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh conditions
• High mechanical strength with 70,000 PSI tensile strength and Rockwell B70 hardness for demanding industrial applications
• Reliable thread engagement with Class 6g fit and coarse thread spacing for quick installation and secure holding power
• Optimized drive performance featuring Phillips No. 2 drive for efficient torque transmission and reduced cam-out risk
• Complete thread coverage with fully threaded design ensuring maximum grip length and uniform load distribution
• Regulatory compliance assurance meeting ASME B18.13.1M specifications for consistent quality and performance

Professional Applications & Engineering Value

These M5 metric screws with external-tooth lock washers provide critical solutions for vibration-prone industrial applications where fastener loosening can compromise equipment safety and performance. The combination of 18-8 stainless steel construction and passivated finish offers exceptional corrosion resistance for harsh environments including manufacturing equipment, electrical enclosures, and outdoor machinery. The coarse thread pitch (0.8mm) and Class 6g thread fit ensure rapid installation while maintaining precise tolerance control. The integrated 410 stainless steel lock washer with external teeth bites into both the workpiece and screw head, creating permanent resistance to rotational forces. This engineering approach addresses common failure points in assembly operations, particularly in automotive components, machinery frames, and vibration-intensive systems where maintaining clamp load is essential for operational integrity.

Specification Summary & Compliance

Manufactured to exact metric dimensions (M5 x 0.8mm x 8mm) with Class 6g thread tolerance ensuring precise fit and interchangeability. Compliant with ASME B18.13.1M mechanical screw specifications for dimensional consistency and performance reliability. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, confirming absence of restricted substances. The fully threaded design provides complete engagement capability, while the pan head profile with Phillips No. 2 drive offers optimized installation efficiency. Both screw and washer feature passivated finish for enhanced corrosion protection in industrial environments.