S-90471A150 4-40 x 3/16" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-lasting performance in demanding industrial environments
• High tensile strength of 60,000 psi provides reliable fastening integrity under significant mechanical stress
• Rockwell B70 hardness offers excellent durability and resistance to wear during installation and use
• Class 2A thread fit ensures smooth assembly and consistent performance with standard mating components
• 100° countersink angle with standard flat head profile enables flush mounting for clean, professional finishes
• Phillips No. 1 drive facilitates efficient installation with common tools while minimizing cam-out risks
• Fully threaded design maximizes grip length and provides uniform clamping force across the entire engagement

Professional Applications & Engineering Value

This 4-40 UNC flat head screw delivers exceptional engineering value for precision assembly applications where space constraints and surface finish are critical. The zinc-plated steel construction provides essential corrosion protection for industrial equipment, electronic enclosures, and machinery components exposed to moderate environmental conditions. The coarse thread design ensures rapid installation and superior holding power in various materials, while the standard flat head profile with 100° countersink angle creates seamless, flush surfaces that eliminate protrusions in tight-clearance applications. Engineered to meet rigorous industrial standards, these Phillips drive screws offer reliable performance in manufacturing, automation systems, and electronic assemblies where consistent fastening and professional appearance are paramount.

Specification Summary & Compliance

This flat head screw features precise Class 2A thread fit per UNC standards with 3/16" length in the inch measurement system. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) standards for chemical safety, ensuring environmental responsibility and regulatory acceptance in global markets.