S-90402A610 1/4"-20 x 3/8" ASME B18.13 Steel Pan Head Phillips Screws with External-Tooth Lock Washer
Steel Pan Head Phillips Screws with External-Tooth Lock Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior vibration resistance with integrated external-tooth lock washers that maintain clamp force in high-stress environments
- Enhanced corrosion protection through zinc-plated steel construction for extended service life in harsh conditions
- High-strength performance with 60,000 psi tensile strength and Rockwell B69 hardness for demanding applications
- Quick installation efficiency with UNC coarse threading and No. 3 Phillips drive for rapid assembly operations
- Reliable thread engagement through fully threaded design and Class 2A fit for consistent fastening performance
- Optimized head design with rounded pan profile providing excellent driver engagement and clean appearance
- Regulatory compliance assurance meeting ASME B18.13 specifications and environmental standards
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws deliver exceptional engineering value in industrial applications where vibration resistance and corrosion protection are critical. The combination of external-tooth lock washers and fully threaded UNC coarse spacing prevents loosening under dynamic loads, making them ideal for machinery, equipment assembly, and automotive components. The 60,000 psi tensile strength ensures structural integrity in heavy-duty applications, while the zinc-plated finish provides reliable protection against environmental factors. The No. 3 Phillips drive and rounded pan head design facilitate efficient installation in confined spaces, reducing assembly time and labor costs while maintaining professional-grade fastening performance.
Specification Summary & Compliance
This 1/4"-20 x 3/8" screw features Class 2A thread fit with UNC coarse thread spacing and full threading for precise engagement. Manufactured to ASME B18.13 specifications with compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The external-tooth lock washer (0.51" OD, 0.028" thickness) is integrated with the zinc-plated steel construction, ensuring consistent performance and regulatory adherence across industrial applications.
