S-95345A450 4-40 x 1" ASME B18.13 Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer
Stainless Steel Pan Head Phillips Screws with External-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 external-tooth lock washer that maintains clamping force in high-motion environments
- Exceptional corrosion resistance through 18-8 stainless steel construction and passivated surface treatment for extended service life
- High-strength performance delivering 70,000 psi tensile strength for demanding mechanical applications
- Reliable thread engagement with Class 2A thread fit and coarse UNC threading for easier assembly and secure fastening
- Optimized drive efficiency through Phillips No. 1 drive design that prevents cam-out during installation
- Complete thread coverage with fully threaded design ensuring maximum holding power along the entire 1" length
- Comprehensive compliance meeting ASME B18.13 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 4-40 UNC rounded head Phillips screws with integrated external-tooth lock washers provide critical vibration resistance in industrial machinery, electronic enclosures, and automotive assemblies where loosening under dynamic loads is a primary concern. The 18-8 stainless steel construction combined with passivated finish ensures exceptional corrosion protection in harsh environments, while the coarse thread design facilitates quicker installation and reduces cross-threading risks. The pan head profile offers optimal bearing surface for secure fastening, making these screws ideal for applications requiring reliable, maintenance-free performance in vibration-prone equipment and precision mechanical systems.
Specification Summary & Compliance
This fastener features Class 2A thread fit tolerance with 4-40 UNC coarse threads and right-hand threading direction. Manufacturing complies with ASME B18.13 specifications, ensuring dimensional accuracy and performance reliability. The assembly meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) environmental standards, confirming adherence to international regulatory requirements for hazardous substance restrictions.
