S-90403A832 2-56 x 1/8" 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 through integrated internal-tooth lock washers that maintain secure fastening in high-motion environments
- Enhanced corrosion protection with zinc-plated steel construction ensuring longevity in demanding industrial conditions
- High-strength performance delivering 60,000 psi tensile strength and Rockwell B69 hardness for reliable load-bearing capabilities
- Optimized drive engagement with Phillips No. 1 drive providing secure tool mating and reduced cam-out during installation
- Precision thread compatibility through Class 2A UNC coarse threads ensuring consistent mating with standard components
- Complete thread coverage with fully threaded design maximizing grip length and fastening security in shallow applications
- Regulatory compliance assurance meeting ASME B18.13 specifications and environmental standards for global industrial use
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws with integrated internal-tooth lock washers provide critical vibration resistance in demanding applications including electronic enclosures, precision instruments, and light machinery assemblies. The combination of 2-56 UNC coarse threading and Class 2A thread fit ensures rapid installation while maintaining precise tolerance control. The pan head profile with Phillips drive offers optimal clearance and torque transmission, while the zinc plating creates a protective barrier against corrosion in industrial environments. Engineered for reliability, these fully threaded screws deliver consistent performance where space constraints and vibration challenges would compromise ordinary fasteners.
Specification Summary & Compliance
Manufactured to exacting standards with Class 2A thread fit and UNC coarse thread spacing ensuring dimensional accuracy and compatibility. These rounded head screws comply with ASME B18.13 manufacturing specifications and meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. The 1/8" length with fully threaded design provides maximum engagement in compact assemblies while maintaining the specified 60,000 psi tensile strength and Rockwell B69 hardness ratings.
