S-91771A936 4-40 x 3/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat 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 for long-lasting performance in harsh environments
- Exceptional mechanical strength delivering 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing capabilities
- Precision thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
- Optimized flush mounting featuring standard 100° countersink angle for seamless surface integration
- Enhanced drive stability with No. 1 Phillips drive providing consistent torque transmission and reduced cam-out risk
- Full-threaded design maximizing grip length and distribution for superior holding power
- Regulatory compliance meeting ASME B18.6.3 specifications for dimensional accuracy and industrial safety standards
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against chemical exposure and environmental degradation, making these Phillips drive screws ideal for marine, chemical processing, and outdoor equipment applications. The fully threaded design with Class 2A thread fit ensures maximum thread engagement in thin materials and soft substrates, while the standardized 100° countersink angle enables perfect flush mounting in precision assemblies. These industrial flat head screws maintain consistent performance under dynamic loads thanks to their 80,000 psi tensile strength, providing engineers with reliable fastening solutions for critical joints and structural components.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for precision dimensional control. Features UNC coarse threads with right-hand direction and complete threading along the 3/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial applications while maintaining 80,000 psi tensile strength and Rockwell B80 hardness specifications.
