S-90402A605 12-24 x 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-vibration environments
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial conditions
- High tensile strength rating of 60,000 psi ensures reliable fastening performance under heavy loads
- Optimized drive engagement with Phillips No. 3 drive style for efficient installation and reduced cam-out
- Full thread coverage along the 1/2" length provides maximum grip and holding power
- Precision thread fit with Class 2A UNC coarse threads for easy assembly and consistent performance
- Comprehensive compliance with ASME B18.13 standards and environmental regulations for quality assurance
Professional Applications & Engineering Value
These zinc-plated steel rounded pan head screws with external-tooth lock washers deliver exceptional engineering value in demanding industrial applications. The combination of 60,000 psi tensile strength and Rockwell B69 hardness ensures reliable performance in machinery assembly, electrical enclosures, and automotive components where vibration resistance is critical. The 12-24 UNC coarse threads provide excellent engagement in various materials, while the integrated lock washer eliminates the need for separate anti-vibration components, streamlining installation and reducing inventory complexity. The Phillips No. 3 drive offers familiar, efficient installation across manufacturing and maintenance operations.
Specification Summary & Compliance
This rounded pan head screw features precise Class 2A thread fit with 12-24 UNC coarse threads and right-hand threading direction. Manufactured to ASME B18.13 specifications, the fastener maintains dimensional accuracy throughout its 1/2" fully threaded length. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental responsibility while meeting industrial performance requirements. The external-tooth lock washer provides consistent locking performance with 0.41" outer diameter and 0.027" thickness, complementing the screw's vibration-resistant design.
