S-90276A580 5/16"-18 x 5/8" ASME B18.6.3 Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior Corrosion Resistance with zinc plating, extending service life in demanding industrial environments.
• High Tensile Strength of 60,000 psi ensures reliable, vibration-resistant fastening for heavy-duty applications.
• Coarse UNC Threading (5/16"-18) provides quick assembly and reduced cross-threading risk, ideal for rapid production lines.
• Class 2A Thread Fit guarantees consistent, precise engagement with standard nuts for smooth installation.
• Full Threading Along the 5/8" Length maximizes grip and load distribution across the entire fastener.
• Rockwell B69 Hardness offers excellent durability and resistance to wear under repetitive stress.
• Slotted Drive Design allows for easy installation with common tools, reducing assembly time and costs.

Professional Applications & Engineering Value

This zinc-plated steel rounded head screw is engineered to address critical challenges in industrial assembly, such as corrosion-induced failure and thread stripping. The UNC coarse thread and Class 2A fit ensure quick, secure fastening in materials like sheet metal or castings, minimizing installation errors. With a 60,000 psi tensile strength and Rockwell B69 hardness, it withstands high vibration and load in machinery, automotive, and construction applications. The slotted drive facilitates easy maintenance, while the zinc plating provides a protective barrier against moisture and chemicals, making it a dependable choice for corrosion-resistant fastening solutions in harsh environments.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy and performance reliability. The UNC coarse thread (5/16"-18) maintains a Class 2A thread fit for consistent tolerance, and it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions are met for industrial use.