S-96640A056 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 black-oxide coated 18-8 stainless steel, ideal for harsh environments and extended service life
- High tensile strength of 80,000 psi ensures reliable, vibration-resistant fastening in demanding industrial applications
- Precision Class 2A thread fit for smooth installation and consistent engagement, reducing assembly time and errors
- Standard 82° countersink angle allows for flush mounting, providing a clean, professional finish and eliminating snagging
- Phillips drive design offers widespread tool compatibility and efficient torque transfer during installation
- Full threading along the 3/8" length maximizes grip and load distribution across the entire fastened joint
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards for global supply chains
Professional Applications & Engineering Value
These 4-40 UNC flat head screws are engineered to address common industrial challenges such as corrosion-induced failure and loosening under vibration. The black-oxide 18-8 stainless steel construction provides excellent resistance to moisture and chemicals, making them suitable for outdoor equipment, electronic enclosures, and machinery assemblies. The coarse UNC thread and fully threaded design ensure quick, secure fastening in materials like metal and plastic, reducing the risk of strip-out. With a Rockwell B80 hardness and precise flat head profile, they deliver consistent performance in automated or manual installations, enhancing productivity and reducing maintenance costs in industrial fastening applications.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 2A fit for standard dimensional accuracy, a 3/8" length, and fully threaded shank. It conforms to ASME B18.6.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets rigorous safety and environmental standards for industrial use.
