S-92703A116 4-40 x 5/8" ASME B18.3 Stainless Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Enhanced torque transmission and reduced cam-out thanks to the Torx Plus drive (IP10/T10) for reliable installation and removal
• High-strength performance with 60,000 psi tensile strength and Rockwell B70 hardness to withstand demanding mechanical loads
• Precise Class 3A thread fit ensuring secure, vibration-resistant fastening in critical assemblies
• Optimal flush mounting with standard 82° countersink angle and flat head design for smooth surface finishes
• Full threading along the 5/8" length provides maximum grip and holding power across the entire fastener
• Compliance with industry standards including ASME B18.3 and environmental regulations for assured quality and safety

Professional Applications & Engineering Value

Engineered for precision and durability, these 4-40 UNC flat head screws solve critical fastening challenges in industrial and engineering applications. The combination of 18-8 stainless steel and a passivated finish delivers exceptional resistance to corrosion, oxidation, and chemical exposure, making them ideal for machinery, electronics, and outdoor equipment. The Torx Plus drive system (IP10/T10) minimizes tool slippage and distributes torque evenly, preventing damage during high-stress assembly. With coarse thread spacing and Class 3A thread fit, these screws ensure rapid installation and reliable performance in materials where vibration resistance is crucial. Their fully threaded design and 82° countersink enable seamless integration into panels, frames, and enclosures, providing a secure, low-profile fastening solution that meets rigorous ASME B18.3 specifications.

Specification Summary & Compliance

This flat head screw features a 4-40 UNC thread with Class 3A precision fit and coarse spacing for optimal engagement. Manufactured in compliance with ASME B18.3 standards, it ensures dimensional accuracy and interoperability. The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, adhering to environmental and safety regulations for hazardous substance restrictions.