S-90403A841 1/4"-28 x 3/4" ASME B18.13 Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
Steel Pan Head Phillips Screws with Internal-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 internal-tooth lock washer that maintains clamping force under dynamic loads
- Enhanced corrosion protection through zinc-plated steel construction for extended service life in harsh environments
- High tensile strength performance rated at 60,000 psi for reliable fastening in demanding applications
- Precise thread engagement with UNF fine threads and Class 2A fit ensuring secure, accurate installation
- Optimized drive efficiency through Phillips No. 3 drive design for controlled torque application
- Comprehensive compliance assurance meeting ASME B18.13 standards and environmental regulations
- Full-threaded design providing maximum grip length and uniform stress distribution
Professional Applications & Engineering Value
These zinc-plated steel pan head screws with internal-tooth lock washers deliver critical vibration resistance in industrial machinery, automotive assemblies, and electrical enclosures where loosening under dynamic loads poses significant reliability concerns. The UNF fine thread configuration ensures superior clamping force maintenance compared to coarse threads, while the Rockwell B69 hardness provides optimal balance between strength and ductility. The fully threaded design maximizes engagement in both thick and thin materials, and the zinc plating offers essential corrosion protection for extended service life in challenging environments. These rounded head screws are engineered to solve common fastening failures in vibration-prone applications.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNF fine thread specifications (1/4"-28). Complies with ASME B18.13 manufacturing standards and maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 3/4" length, 0.492" head diameter, and internal-tooth lock washer with 0.478" OD for secure fastening performance.
