S-96640A162 4-40 x 1 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh environments and extending service life.
• High tensile strength of 80,000 psi ensures reliable performance under significant mechanical stress and vibration.
• Precise Class 2A thread fit guarantees smooth assembly and secure fastening, reducing the risk of cross-threading.
• Fully threaded coarse UNC design provides excellent grip and holding power in a wide range of materials.
• Standard 82° countersink angle allows for a flush, professional finish, minimizing protrusion and snagging hazards.
• Durable Rockwell B80 hardness offers excellent wear resistance, maintaining thread integrity through repeated use.
• Compliance with ASME B18.6.3, RoHS 3, and REACH ensures product quality, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

These 4-40 UNC flat head screws are engineered to solve critical challenges in industrial assembly and machinery. The Black-Oxide 18-8 Stainless Steel construction provides exceptional corrosion resistance, making them suitable for applications exposed to moisture, chemicals, or outdoor elements. The fully threaded coarse UNC design and Class 2A thread fit ensure quick, reliable installation in metal, plastic, and composite materials, reducing assembly time and improving production efficiency. The flat head with Phillips drive and 82° countersink angle delivers a secure, flush mount, essential for applications where a smooth surface is critical, such as in electronic enclosures, automotive components, and precision equipment. Their high tensile strength and durability make them a trusted choice for heavy-duty fastening in demanding environments.

Specification Summary & Compliance

This product adheres to precise dimensional and performance standards. The thread fit is Class 2A per UNC specifications, ensuring compatibility and ease of assembly. Manufacturing and quality are governed by ASME B18.6.3. The screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they are free from hazardous substances and meet strict environmental and health safety standards for global industrial use.