S-96640A265 4-40 x 1/2" 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 Black-Oxide 18-8 Stainless Steel construction, ideal for harsh industrial environments
- Exceptional tensile strength of 80,000 psi ensures reliable, long-lasting fastening under high-stress conditions
- Precise flush mounting with 82° countersink angle and undercut flat head design for seamless surface integration
- Optimized thread engagement through fully threaded UNC coarse spacing with Class 2A fit for consistent performance
- Enhanced drive stability with No. 1 Phillips drive preventing cam-out during installation
- Consistent mechanical properties maintained through Rockwell B80 hardness for repeated use without deformation
- Regulatory compliance assurance meeting ASME B18.6.3 manufacturing standards and environmental regulations
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where corrosion resistance and precision matter most. The Black-Oxide 18-8 Stainless Steel construction provides superior protection against oxidation and chemical exposure, making them ideal for marine equipment, food processing machinery, and outdoor industrial applications. The combination of fully threaded coarse spacing and Class 2A thread fit ensures rapid installation with minimal cross-threading risk, while the undercut flat head profile with 82° countersink angle creates perfectly flush surfaces in precision assemblies. These Phillips drive screws maintain structural integrity in vibration-prone environments, offering engineers a reliable fastening solution that withstands both mechanical stress and environmental challenges.
Specification Summary & Compliance
Manufactured to exact ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent engagement. The 4-40 UNC coarse thread configuration ensures reliable performance in various materials. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards guarantees safe use across regulated industries. Mechanical properties include Rockwell B80 hardness and 80,000 psi tensile strength, validated through standardized testing protocols.
