S-90402A106 4-40 x 1/4" 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 washer that maintains secure fastening in high-motion environments
- Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial conditions
- High tensile strength rating of 60,000 psi ensures reliable performance under substantial mechanical stress
- Optimized drive engagement with Phillips No. 1 drive style for efficient installation and reduced cam-out
- Precise thread compatibility with Class 2A UNC coarse threads providing excellent mating with standard components
- Comprehensive regulatory compliance meeting ASME B18.13 specifications and environmental standards including RoHS 3 and REACH
- Full-threaded design ensures maximum grip length and uniform load distribution along the entire fastener
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws with 4-40 UNC coarse threading deliver exceptional engineering value across industrial applications where vibration resistance and consistent performance are critical. The integrated external-tooth lock washer provides permanent anti-loosening protection, solving common fastening failures in machinery, electronic enclosures, and assembly lines. The Phillips No. 1 drive ensures quick installation while the pan head profile offers a low-profile finish. Manufactured from high-strength steel with Rockwell B69 hardness, these screws maintain structural integrity in demanding environments while the zinc plating provides essential corrosion resistance for long-term reliability in manufacturing and equipment applications.
Specification Summary & Compliance
This fastener features precision Class 2A thread fit with UNC coarse threading (4-40 size) and fully threaded design for optimal engagement. Manufacturing compliance includes ASME B18.13 specifications for dimensional accuracy and performance standards. Environmental compliance is verified through RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant certifications, ensuring these screws meet current regulatory requirements for industrial use while maintaining the specified tensile strength of 60,000 psi and material hardness properties.
