S-90403A087 2-56 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 prevents loosening under dynamic loads
- Enhanced corrosion protection through zinc-plated steel construction for extended service life in harsh environments
- Optimized drive engagement with No. 1 Phillips drive for efficient installation and reduced cam-out risk
- Reliable thread performance featuring Class 2A UNC coarse threads for consistent fastening in various materials
- High mechanical strength with 60,000 psi tensile strength and Rockwell B69 hardness for demanding applications
- Full-thread engagement along the 3/4" length provides maximum grip and load distribution
- Industry compliance assurance meeting ASME B18.13 specifications for dimensional accuracy and performance
Professional Applications & Engineering Value
These zinc-plated steel screws with internal-tooth lock washers provide critical vibration-resistant fastening solutions for industrial equipment, electronic enclosures, and machinery assemblies. The rounded pan head design with Phillips drive offers low-profile installation while the 2-56 UNC coarse threads ensure rapid assembly and reliable holding power. The integrated locking mechanism eliminates the need for separate washers, reducing installation time and preventing fastener failure in high-vibration environments. Engineered with 60,000 psi tensile strength, these fully threaded screws maintain integrity under mechanical stress, making them ideal for applications where security and durability are paramount.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading for consistent performance. Complies with ASME B18.13 specifications for mechanical fasteners and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 0.167" head diameter, 3/4" length, and right-hand threading with internal-tooth lock washer (0.185" OD) integrated for immediate vibration resistance.
