S-90402A720 M6 x 25 mm ASME B18.13.1M 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
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in demanding conditions
• Optimized drive engagement with Phillips No. 3 drive design providing reliable torque transmission and reduced cam-out risk
• Maximum thread engagement through fully threaded M6 coarse thread design ensuring superior holding power across the entire length
• High mechanical strength delivering 60,000 psi tensile strength and Rockwell B73 hardness for heavy-duty applications
• Secure fastening performance with Class 6g thread fit ensuring precise mating with standard metric nuts and components
• Easy installation with rounded pan head profile that provides smooth surface transition and reduces snagging

Professional Applications & Engineering Value

These M6 metric screws with zinc-plated steel construction address critical industrial fastening challenges where vibration loosening and environmental exposure compromise joint integrity. The integrated external-tooth lock washer bites into both the bearing surface and screw head, creating permanent resistance to rotational forces in machinery, automotive assemblies, and electrical enclosures. The fully threaded coarse pitch design (1mm pitch) ensures rapid installation and maximum thread contact in various material thicknesses. With Phillips No. 3 drive compatibility, these rounded head screws deliver reliable performance in high-volume assembly operations while the corrosion-resistant zinc plating extends service life in moderate environmental conditions. The combination of 60,000 psi tensile strength and precise Class 6g thread fit makes these fasteners ideal for structural applications requiring predictable clamp load and fatigue resistance.

Specification Summary & Compliance

This M6 x 25mm screw features precision Class 6g thread fit according to metric standards with coarse 1mm pitch threading. Manufacturing complies with ASME B18.13.1M specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety. The zinc-plated steel construction combined with external-tooth lock washer provides reliable performance within specified mechanical properties including Rockwell B73 hardness and 60,000 psi tensile strength.