S-90403A238 10-24 x 3/8" 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 under dynamic loads
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial environments
- Optimized drive engagement with Phillips No. 2 drive for reliable torque transmission and reduced cam-out risk
- Precise thread compatibility with UNC coarse threads and Class 2A fit ensuring smooth installation and consistent performance
- High-strength reliability with 60,000 psi tensile strength and Rockwell B69 hardness for demanding applications
- Complete thread coverage with fully threaded design providing maximum grip length and holding power
- Regulatory compliance assurance meeting ASME B18.13 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
These zinc-plated steel Phillips pan head screws with internal-tooth lock washers address critical vibration-induced loosening challenges in industrial assemblies. The combination of UNC coarse threads and Class 2A fit ensures rapid installation while maintaining precision alignment in machinery, electrical enclosures, and automotive components. The rounded pan head profile provides a finished appearance while accommodating standard Phillips No. 2 drivers commonly available in maintenance toolkits. With 60,000 psi tensile strength and Rockwell B69 hardness, these fully threaded screws deliver consistent clamping force across the entire engagement length, making them ideal for applications requiring reliable vibration resistance without compromising structural integrity.
Specification Summary & Compliance
Manufactured to exacting ASME B18.13 specifications with Class 2A thread fit tolerance for consistent performance. Features UNC coarse threads (10-24) with right-hand thread direction and standard 3/8" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The internal-tooth lock washer (0.383" OD) is integrated for permanent vibration resistance without separate components.
