S-90403A833 4-40 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 washer that maintains clamping force under dynamic loads
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding environments
- Optimized drive engagement with No. 1 Phillips drive providing reliable torque transmission and reduced cam-out risk
- Maximum thread engagement with fully threaded 1/8" length ensuring superior holding power in shallow applications
- Precision thread compatibility with Class 2A UNC coarse threads for easy assembly and consistent performance
- High mechanical strength with 60,000 psi tensile strength and Rockwell B69 hardness for demanding applications
- Secure component mounting with rounded pan head design distributing clamp load evenly across fastened materials
Professional Applications & Engineering Value
These 4-40 UNC machine screws with integrated internal-tooth lock washers solve critical vibration-induced loosening issues in industrial assemblies. The zinc-plated steel construction provides essential corrosion resistance for machinery, electronic enclosures, and automotive components exposed to environmental challenges. The coarse thread design ensures rapid installation and reliable performance in materials where fine threads might strip, while the fully threaded 1/8" length maximizes engagement in limited-space applications. The combination of 60,000 psi tensile strength and Rockwell B69 hardness delivers exceptional durability for high-stress fastening requirements, making these Phillips drive screws ideal for maintenance, manufacturing, and equipment repair applications where vibration resistance and long-term reliability are paramount.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threads (4-40) and right-hand threading. Complies with ASME B18.13 specifications for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for environmental safety and regulatory requirements in industrial applications.
