S-92480A110 4-40 x 1/2" ASME B18.6.3 Brass Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to brass construction, ideal for harsh environments and moisture-prone applications
• Excellent mechanical strength with 50,000 psi tensile strength and Rockwell B50 hardness for reliable load-bearing performance
• Precise flush mounting enabled by the standard 82° countersink angle and flat head profile for seamless surface integration
• Effortless installation with Phillips No. 1 drive and coarse UNC threading, reducing assembly time and tool wear
• Consistent thread engagement guaranteed by Class 2A thread fit and fully threaded design for secure fastening
• Regulatory compliance assurance meeting ASME B18.6.3 specifications, RoHS 3, and REACH standards for safe industrial use
• Dimensional reliability with inch-system precision ensuring compatibility with standard UNC 4-40 threaded components

Professional Applications & Engineering Value

These 4-40 UNC brass flat head screws deliver critical engineering value in applications where corrosion resistance and precision fit are paramount. The brass material inherently resists oxidation and galvanic corrosion, making these Phillips drive screws ideal for electrical enclosures, marine hardware, and plumbing systems exposed to moisture. The fully threaded design and Class 2A thread fit ensure maximum thread contact and vibration resistance, preventing loosening in dynamic environments. With their 82° countersink angle and flat head profile, they provide a smooth, flush finish that eliminates protrusions in assembled products—essential for consumer electronics, instrumentation, and machinery where aerodynamic or aesthetic surfaces are required. Their compliance with ASME B18.6.3 guarantees consistent quality and interchangeability, reducing downtime in manufacturing and maintenance operations.

Specification Summary & Compliance

These screws adhere to Class 2A thread fit tolerances per UNC (Unified National Coarse) standards, ensuring precise dimensional accuracy. Manufacturing follows ASME B18.6.3 specifications for inch-system fasteners, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they are free from hazardous substances. The coarse thread spacing and right-hand thread direction provide optimal engagement in most materials, while the 1/2" length and No. 1 Phillips drive size maintain consistency across batches for reliable industrial use.