S-96640A252 1/4"-20 x 4 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with Black-Oxide 18-8 Stainless Steel, ideal for humid or chemically exposed environments
• High tensile strength of 80,000 psi ensures reliable performance under heavy loads and vibrations
• Rockwell B80 hardness provides excellent durability and resistance to wear over time
• Fully threaded design allows for maximum grip and uniform stress distribution along the entire length
• Standard 82° countersink angle enables flush mounting for a smooth, professional finish
• Class 2A thread fit with UNC coarse threading ensures easy installation and secure fastening in various materials
• Phillips drive (No. 3 size) offers efficient torque transfer and reduces the risk of cam-out during assembly

Professional Applications & Engineering Value

These flat head Phillips screws are engineered to address common industrial challenges such as component loosening due to vibration and corrosion in harsh conditions. The Black-Oxide 18-8 Stainless Steel construction provides a protective layer that minimizes oxidation, making them suitable for outdoor equipment, machinery, and marine applications. The fully threaded and UNC coarse thread design ensures quick installation and strong holding power in metals, plastics, and wood, reducing assembly time and maintenance needs. With a standard 82° countersink angle, they sit flush with surfaces, preventing snagging and improving safety in automated systems and structural frameworks.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and adheres to ASME B18.6.3 specifications for dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets. The right-hand UNC coarse thread and standard flat head profile guarantee consistent performance in demanding applications.