S-90279A105 4-40 x 3/16" ASME B18.6.3 Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc plating for prolonged service life in demanding environments
• Superior holding power from 60,000 psi tensile strength and Rockwell B69 hardness for reliable fastening
• Quick and secure installation with No. 1 Phillips drive and rounded head design reducing cam-out risks
• Broad material compatibility due to 4-40 UNC coarse threads ensuring strong grip in various substrates
• Precise thread engagement with Class 2A fit and fully threaded shank for consistent clamping force
• Regulatory compliance meeting ASME B18.6.3, RoHS, and REACH for global industrial applications
• Optimized for high-volume assembly with standardized 3/16" length and right-hand threading

Professional Applications & Engineering Value

Engineered for industrial durability, these zinc-plated steel screws combine 60,000 psi tensile strength with Rockwell B69 hardness to withstand vibration and dynamic loads in machinery, electronics, and automotive assemblies. The 4-40 UNC coarse thread design ensures rapid installation and robust retention in metals and plastics, while the rounded head with Phillips drive minimizes workpiece damage and tool slippage. Fully threaded construction provides uniform stress distribution, making these Class 2A tolerance screws ideal for precision equipment requiring repeated disassembly. Compliant with ASME B18.6.3, they deliver consistent performance in regulated environments.

Specification Summary & Compliance

This 3/16" length screw adheres to Class 2A thread fit tolerances per UNC standards, with full threading and right-hand orientation. Manufacturing conforms to ASME B18.6.3 specifications, ensuring dimensional accuracy for inch-system applications. Environmental compliance is verified under RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), supporting use in international supply chains.