S-92451A103 4-40 x 1/8" ASME B18.6.3 Brass Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from durable brass construction, ensuring long-term reliability in demanding environments
• Precise flush mounting with 82° countersink angle and undercut flat head profile for seamless surface integration
• Exceptional mechanical strength with 50,000 PSI tensile strength and Rockwell B50 hardness for heavy-duty applications
• Reliable thread engagement through Class 2A fit UNC coarse threads with full threading for maximum holding power
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent performance and interchangeability
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global regulatory acceptance
• Easy installation and removal with traditional slotted drive design for straightforward manual assembly

Professional Applications & Engineering Value

These 4-40 UNC flat head slotted brass screws deliver critical performance advantages in precision engineering applications where corrosion resistance and reliable fastening are paramount. The brass material provides excellent protection against oxidation and galvanic corrosion, making these screws ideal for electrical components, marine equipment, and plumbing systems. The undercut flat head profile with 82° countersink angle ensures flush mounting without protrusion, preventing snagging while maintaining aesthetic appeal. With coarse thread spacing and Class 2A thread fit, these fasteners offer superior grip in softer materials and rapid installation in production environments. The combination of 50,000 PSI tensile strength and Rockwell B50 hardness ensures these screws maintain integrity under vibration and load stress, providing engineers with a reliable fastening solution for critical assemblies.

Specification Summary & Compliance

This 4-40 UNC flat head slotted brass screw features precise dimensional accuracy with Class 2A thread fit per UNC standards, ensuring proper engagement and interchangeability. Manufacturing complies with ASME B18.6.3 specifications for consistent quality and performance. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) compliance for chemical safety, making it suitable for global industrial applications requiring environmental regulation adherence.