S-90402A843 1/4"-20 x 1 1/2" 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 through integrated external-tooth lock washer that maintains clamping force in high-motion applications
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial environments
- Quick installation and removal with No. 3 Phillips drive design that provides reliable tool engagement
- Optimized thread engagement with UNC coarse spacing and Class 2A thread fit ensuring consistent performance
- Full-length threading for maximum holding power across the entire fastener length
- Rounded pan head profile offering low-profile installation with standard tool clearance
- Regulatory compliance assurance meeting industry standards for safety and environmental requirements
Professional Applications & Engineering Value
This zinc-plated steel rounded head screw with integrated external-tooth lock washer addresses critical vibration-induced loosening challenges in industrial assemblies. The combination of fully threaded UNC coarse spacing and Class 2A thread fit ensures reliable performance in machinery, equipment manufacturing, and structural applications where consistent clamping force is essential. The No. 3 Phillips drive provides efficient installation while the zinc-plated steel construction offers corrosion resistance for extended service life in demanding environments. These industrial screws are engineered to maintain integrity in applications subject to constant motion, temperature variations, and mechanical stress, making them ideal for automotive, manufacturing, and heavy equipment sectors.
Specification Summary & Compliance
This fastener features Class 2A thread fit with UNC coarse thread spacing (1/4"-20) and right-hand threading. Manufactured to ASME B18.13 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The external-tooth lock washer (0.51" OD, 0.028" thickness) is integrated with the zinc-plated steel construction for consistent performance meeting industrial standards.
