S-96640A335 4-40 x 5/16" 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
- Exceptional corrosion resistance with Black-Oxide 18-8 Stainless Steel construction, ideal for harsh environments and reducing maintenance costs.
- High tensile strength of 80,000 psi ensures reliable load-bearing capacity and prevents fastener failure under stress.
- Rockwell B80 hardness provides superior durability and wear resistance for long-term performance in demanding applications.
- 100° countersink angle allows for a flush, secure fit that minimizes protrusion and improves aesthetic finish.
- Class 2A thread fit offers consistent, easy assembly with standard UNC coarse threads, reducing installation time.
- Fully threaded design maximizes grip and holding power across the entire length for enhanced joint integrity.
- Phillips drive with No. 1 size enables efficient, slip-resistant driving with common tools, speeding up assembly processes.
Professional Applications & Engineering Value
These 4-40 UNC flat head screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and high-stress demands. The Black-Oxide 18-8 Stainless Steel material provides excellent resistance to rust and chemicals, making them suitable for outdoor equipment, marine hardware, and electronics enclosures. The coarse UNC threading and Class 2A fit ensure quick, reliable fastening in metals and plastics, reducing assembly errors. With a 100° countersink angle, they sit flush to prevent snagging and improve safety in machinery and automotive components. These screws deliver consistent performance in industrial assembly where durability and compliance are critical.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including Class 2A thread fit for consistent tolerance and UNC coarse threads per industry norms. It meets ASME B18.6.3 specifications for flat head screw design, ensuring reliability in mechanical applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety and restricts hazardous substances, supporting sustainable manufacturing practices.
