S-90401A542 1/4"-20 x 1" Hex Head Screws with Lock Washer
Hex Head Screws with 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 for secure, long-lasting fastening in high-stress environments
- Enhanced durability and corrosion protection from zinc-plated steel construction, extending service life in industrial settings
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and mechanical stress
- Rockwell B70 hardness provides excellent wear resistance and prevents deformation during installation
- Class 2A thread fit with UNC coarse threading allows for easy, quick assembly and reliable engagement
- External hex drive design enables efficient torque application with standard tools, reducing installation time
- Fully threaded shank offers maximum grip and uniform clamping force across the entire length
Professional Applications & Engineering Value
These 1/4-20 UNC hex head screws with integrated external-tooth lock washers are engineered to solve critical fastening challenges in demanding industrial applications. The zinc-plated steel construction provides excellent corrosion resistance, while the coarse UNC threading and Class 2A fit ensure reliable performance in vibration-prone environments such as machinery, automotive assemblies, and structural frameworks. The external-tooth lock washer design prevents loosening under dynamic loads, making these screws ideal for equipment subject to constant movement or thermal cycling. With 60,000 psi tensile strength and Rockwell B70 hardness, they maintain integrity in high-stress applications where failure is not an option, delivering consistent performance in manufacturing, construction, and maintenance operations.
Specification Summary & Compliance
This 1/4-20 UNC hex head screw features Class 2A thread fit with coarse threading and right-hand direction, manufactured from zinc-plated steel for enhanced durability. The screw includes an integrated external-tooth lock washer (0.475" OD, 0.028" thickness) and is fully threaded for maximum engagement. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental safety and regulatory adherence for industrial use.
