S-92451A119 4-40 x 1 1/2" ASME B18.6.3 Brass Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with brass construction for long-lasting performance in harsh environments
• Precise flush mounting achieved through standard 82° countersink angle and flat head design
• Reliable thread engagement with Class 2A UNC coarse threads ensuring secure fastening
• Exceptional mechanical strength featuring 50,000 psi tensile strength and Rockwell B50 hardness
• Full threading versatility providing maximum grip along the entire 1½" length
• Compliance assurance meeting ASME B18.6.3 standards and environmental regulations
• Easy manual installation with slotted drive design for straightforward tool engagement

Professional Applications & Engineering Value

These 4-40 UNC brass flat head screws deliver critical advantages in precision assembly applications where corrosion resistance and flush surface requirements are paramount. The brass material provides excellent protection against oxidation and galvanic corrosion, making them ideal for electrical components, marine equipment, and plumbing systems. The fully threaded design ensures maximum holding power across the entire fastener length, while the 82° countersink angle guarantees proper seating in tapered holes for smooth, flush surfaces. With Class 2A thread fit and coarse UNC threading, these screws offer reliable installation in various materials without compromising joint integrity, solving common challenges of vibration loosening and material incompatibility in industrial environments.

Specification Summary & Compliance

These flat head screws maintain precise dimensional accuracy with Class 2A thread fit per UNC standards and ASME B18.6.3 manufacturing specifications. The inch-system fasteners feature right-hand thread direction and are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries and international markets.