S-90403A104 4-40 x 3/16" 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 washers that maintain secure fastening in high-motion environments
- Enhanced corrosion protection through zinc-plated steel construction, extending service life in industrial settings
- Optimized drive engagement with Phillips No. 1 drive for reliable torque transmission and reduced cam-out risk
- High load-bearing capacity with 60,000 psi tensile strength and Rockwell B69 hardness for demanding applications
- Quick installation compatibility featuring coarse UNC threads and Class 2A fit for rapid assembly with standard tools
- Comprehensive thread coverage with fully threaded design ensuring maximum grip along the entire 3/16" length
- Regulatory compliance assurance meeting ASME B18.13 specifications and environmental standards for global industrial use
Professional Applications & Engineering Value
These 4-40 UNC 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 profile with Phillips drive enables flush mounting while the coarse threading ensures rapid installation in various materials. The combination of 60,000 psi tensile strength and Rockwell B69 hardness delivers reliable performance under mechanical stress, while the zinc plating protects against corrosion in demanding environments. These fully threaded industrial screws maintain clamping force in applications subject to constant vibration, thermal cycling, and dynamic loads.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (4-40) and 3/16" length. Complies with ASME B18.13 mechanical specifications and maintains RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features fully threaded design with 0.268" OD internal-tooth lock washers integrated for immediate vibration resistance without additional components.
