S-90273A505 5/16"-18 x 3" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable performance under heavy loads
• Optimized installation efficiency through Phillips No. 4 drive design and standard 82° countersink for flush mounting
• Enhanced thread engagement with coarse UNC threading and Class 2A fit ensuring secure fastening in various materials
• Versatile partial threading design providing both gripping strength and clearance where needed
• Industry-standard compliance with ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting international regulatory requirements

Professional Applications & Engineering Value

These zinc-plated steel flat head screws deliver critical performance advantages in industrial fastening applications where reliability and corrosion resistance are paramount. The 5/16"-18 UNC coarse thread configuration provides excellent pull-out resistance in wood, plastic, and soft metals, while the partially threaded design allows for precise clamping force control. The 82° countersink angle ensures flush mounting in predrilled holes, eliminating protrusions in machinery, equipment assemblies, and structural frameworks. With Rockwell B70 hardness and 60,000 psi tensile strength, these Phillips drive screws maintain integrity in high-vibration environments common in manufacturing, construction, and automotive applications, reducing maintenance frequency and downtime.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances ensuring consistent performance and interchangeability. The zinc-plated steel construction meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, providing environmentally responsible fastening solutions. Features 5/16"-18 UNC coarse threads with 3" length and partial threading configuration, designed for reliable performance in industrial and commercial applications where quality and regulatory compliance are essential.