S-90402A551 1/4"-20 x 1" 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 clamping force under dynamic loads
- Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial environments
- Optimized drive engagement with Phillips No. 3 drive design for efficient installation and reduced cam-out risk
- Reliable thread performance featuring UNC coarse threading with Class 2A fit for quick assembly and consistent engagement
- High-strength construction delivering 60,000 psi tensile strength and Rockwell B69 hardness for demanding applications
- Full-threaded design providing maximum grip length and uniform stress distribution along the entire fastener
- Standard-compliant quality manufactured to ASME B18.13 specifications for guaranteed dimensional accuracy and performance
Professional Applications & Engineering Value
These zinc-plated steel screws with external-tooth lock washers are engineered to solve critical vibration-induced loosening problems in industrial equipment, machinery assembly, and automotive applications. The pan head design with Phillips drive offers optimal surface contact while the UNC coarse threads ensure rapid installation in production environments. The integrated locking mechanism prevents back-off under continuous vibration, making these 1/4"-20 screws ideal for maintaining structural integrity in high-stress assemblies. The combination of 60,000 psi tensile strength and full threading provides reliable fastening in metal-to-metal and composite material applications where joint security is paramount.
Specification Summary & Compliance
This 1/4"-20 x 1" screw features Class 2A thread fit tolerance with UNC coarse threading and full threading along the entire shank. Manufactured to ASME B18.13 standards for dimensional accuracy and performance consistency. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The external-tooth lock washer provides positive locking action while maintaining 0.51" OD and 0.028" thickness specifications.
