S-91802A105 4-40 x 3/16" ASME B18.6.3 Stainless Steel Phillips Oval Head Screws
Stainless Steel Phillips Oval Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional tensile strength of 80,000 psi ensures reliable fastening under high-stress conditions
- Optimized flush mounting with undercut oval head profile and 82° countersink angle for seamless surface integration
- Precision thread engagement through Class 2A thread fit and coarse UNC threading for rapid installation
- Enhanced drive stability with Phillips No. 1 drive design preventing cam-out during torque application
- Full-threaded design provides maximum grip length and uniform load distribution across the entire fastener
- Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
These 4-40 UNC oval head Phillips flat head screws deliver critical performance advantages in demanding applications where corrosion resistance and flush surface requirements are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making them ideal for electronic enclosures, precision instrumentation, and marine equipment. The undercut oval head profile combined with the 82° countersink angle ensures perfect seating without protrusion, while the coarse UNC threading enables quick assembly in various materials. With 80,000 psi tensile strength and Rockwell B80 hardness, these fully threaded screws maintain integrity in vibration-prone environments, offering engineers a reliable fastening solution that combines mechanical performance with regulatory compliance.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC coarse threading (4-40 size). These oval head Phillips flat head screws comply with ASME B18.6.3 specifications for dimensional accuracy and performance. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet current industry standards for hazardous substance restrictions and chemical safety protocols.
