S-96640A229 4-40 x 9/16" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments
• Superior holding power from fully threaded design and 80,000 psi tensile strength for reliable, long-term fastening
• Precise flush mounting with standard 82° countersink angle and flat head profile for seamless surface integration
• Optimized thread engagement through Class 2A thread fit and coarse UNC threading, ensuring easy installation and vibration resistance
• Enhanced durability with Rockwell B80 hardness, maintaining structural integrity under repeated stress
• Broad compliance with ASME B18.6.3 standards, RoHS 3, and REACH, meeting rigorous industrial and environmental regulations
• Efficient installation using Phillips No. 1 drive, providing secure torque application and reducing tool slippage

Professional Applications & Engineering Value

These 4-40 UNC flat head Phillips screws deliver critical performance in demanding applications where corrosion resistance, strength, and precision are paramount. The Black-Oxide 18-8 Stainless Steel construction combats oxidation and chemical exposure, making them ideal for electronics enclosures, machinery assemblies, and outdoor equipment. The fully threaded design and coarse thread spacing enhance grip in various materials, preventing loosening under vibration. With an 82° countersink angle, they sit flush to avoid protrusions, while the Phillips drive ensures efficient, high-torque installation. These screws address common industrial pain points like fastener failure, compliance complexity, and maintenance costs, offering a reliable, standards-compliant solution for OEMs and maintenance teams.

Specification Summary & Compliance

This product adheres to precise dimensional and performance criteria, including Class 2A thread fit for consistent engagement and UNC coarse threading (4-40 size) with right-hand direction. Manufacturing follows ASME B18.6.3 specifications, ensuring uniformity and reliability. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming environmental safety and regulatory alignment for global industrial use.