S-95345A031 4-40 x 1/2" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
Stainless 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
- Vibration-resistant locking: Integrated 410 stainless steel internal-tooth lock washer prevents loosening under dynamic loads, reducing maintenance needs.
- Superior corrosion resistance: 18-8 stainless steel construction with passivated finish ensures long-term durability in harsh environments.
- High-strength performance: 70,000 psi tensile strength provides reliable fastening for demanding industrial applications.
- Precision threading: Class 2A fit UNC coarse threads enable quick assembly and consistent engagement.
- Enhanced drive stability: Phillips No. 1 drive with rounded pan head design offers secure tool engagement and flush installation.
- Full-thread engagement: Completely threaded 1/2" length maximizes grip strength across the entire fastener.
- Regulatory compliance: Meets ASME B18.13 specifications and environmental standards (RoHS 3/REACH) for quality assurance.
Professional Applications & Engineering Value
Engineered for vibration-prone environments, these 4-40 UNC rounded head Phillips screws with integrated internal-tooth lock washers solve critical fastening challenges in industrial machinery, electronic enclosures, and automotive assemblies. The 18-8 stainless steel material with passivated finish provides exceptional resistance to corrosion and chemical exposure, extending service life in demanding conditions. The coarse threading with Class 2A fit ensures rapid installation and reliable thread engagement, while the Phillips No. 1 drive and pan head design facilitate secure tool mating and flush surface mounting. These fully threaded screws deliver consistent clamping force across the entire 1/2" length, making them ideal for applications requiring vibration resistance and long-term reliability.
Specification Summary & Compliance
This 4-40 UNC screw features Class 2A thread fit with coarse threading per Unified National Coarse standards. Manufacturing complies with ASME B18.13 specifications for dimensional accuracy and performance. The assembly meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Components include 18-8 stainless steel screw body and 410 stainless steel lock washer, both with passivated finish for enhanced corrosion protection.
