S-97595A255 1/4"-20 x 5/8" ASME B18.3 Brass Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with brass construction, ideal for harsh environments and moisture-prone applications
• Exceptional thread reliability with Class 3A fit ensuring precise, vibration-resistant connections in demanding assemblies
• High mechanical strength offering 50,000 psi tensile strength and Rockwell B55 hardness for heavy-duty fastening needs
• Efficient installation and removal through 5/32" hex drive design, providing secure tool engagement and reducing slippage
• Optimal flush seating with 82° countersink angle and standard flat head profile for smooth, unobtrusive surface finishes
• Wide compatibility with UNC coarse 1/4"-20 threading, suitable for various industrial components and machinery
• Full regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, globally accepted usage

Professional Applications & Engineering Value

Engineered for precision and durability, these brass flat head screws address critical challenges in industrial settings where corrosion and mechanical stress are concerns. The UNC coarse thread and Class 3A thread fit provide excellent resistance to loosening under vibration, making them ideal for machinery, electrical enclosures, and marine equipment. The fully threaded design ensures consistent clamping force across the entire length, while the hex drive allows for high-torque installation without cam-out. Brass material inherently resists rust and galvanic corrosion, extending service life in humid or chemical-exposed environments. These screws are commonly specified in OEM assemblies, plumbing systems, and automotive applications where reliability and regulatory adherence are paramount.

Specification Summary & Compliance

This 1/4"-20 UNC flat head screw features a Class 3A thread fit per ASME B18.3, ensuring tight tolerances and reliable performance. The coarse thread spacing and fully threaded 5/8" length provide robust holding power. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions adherence. Dimensional accuracy includes 82° countersink angle, 0.493" head diameter, and 5/32" hex drive size for consistent, industry-standard installation.