S-96640A059 4-40 x 5/8" 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 Black-Oxide coated 18-8 Stainless Steel construction, ideal for harsh industrial environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Precision thread engagement through Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
- Flush mounting capability with standard 82° countersink angle and flat head design for seamless surface integration
- Enhanced driving efficiency with Phillips No. 1 drive providing positive torque transfer and reduced cam-out risk
- Full-threaded design maximizing grip length and distribution of clamping force along the entire 5/8" shaft
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 4-40 UNC flat head Phillips screws deliver critical performance advantages in precision assembly applications where surface flushness and corrosion resistance are paramount. The Black-Oxide 18-8 Stainless Steel construction provides superior protection against oxidation and chemical exposure, making them ideal for electronic enclosures, machinery panels, and outdoor equipment. The combination of 80,000 psi tensile strength and Class 2A thread fit ensures reliable fastening in vibration-prone environments, while the 82° countersink angle allows for clean, recessed installation that prevents snagging and maintains aerodynamic surfaces. These fully threaded 5/8" screws with coarse threading offer excellent pull-out resistance in various materials, solving common challenges of loosening under dynamic loads.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerance for consistent engagement. Features UNC coarse threads (4-40) with right-hand direction and standard 82° flat head profile. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
