S-90121A583 5/16"-18 x 1" ASME B18.2.1 Stainless Steel Wire-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and reducing long-term replacement costs.
• High tensile strength of 70,000 psi ensures reliable performance under significant load and stress in demanding applications.
• Excellent wear resistance provided by a Rockwell B70 hardness, extending the screw's service life and maintaining thread integrity.
• Quick and easy installation with a standard external hex drive and coarse UNC threads, saving valuable assembly time.
• Precise and reliable fit due to the Class 2A thread tolerance, ensuring consistent performance and reducing the risk of cross-threading.
• Full threading along the 1" length offers maximum grip and holding power across the entire fastener.
• Compliance with industry standards including ASME B18.2.1 and RoHS 3, guaranteeing quality and environmental safety for professional use.

Professional Applications & Engineering Value

This 5/16"-18 UNC Hex Head Screw is engineered to solve critical fastening challenges in industrial and construction applications. Manufactured from 18-8 Stainless Steel, it provides exceptional resistance to rust and corrosion, which is vital for outdoor structures, machinery in humid conditions, and chemical processing equipment. The coarse thread design and Class 2A fit allow for rapid assembly and disassembly, even in materials where fine threads might strip or fail. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures that the screw maintains its clamp load and resists deformation under vibration and dynamic loads, preventing joint failure. Its fully threaded body and external hex drive offer superior grip and ease of installation with common tools, making it a reliable choice for heavy-duty frameworks, metal assemblies, and construction projects requiring durable, long-lasting fasteners.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC thread with Coarse spacing and a Class 2A thread fit, ensuring dimensional accuracy and interchangeability. It is manufactured in accordance with ASME B18.2.1 specifications and is RoHS 3 (2015/863/EU) Compliant, confirming adherence to strict mechanical and environmental standards for safe and reliable use in professional settings.