S-92198A695 5/16"-18 x 3" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term outdoor use.
• Exceptional mechanical strength offering 80,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high stress.
• Secure and precise fastening ensured by the Class 2A thread fit, reducing the risk of cross-threading and assembly errors.
• Optimized for high-torque applications featuring an external hex drive and 1/2" head width for easy installation with standard tools.
• Versatile partial threading allows for unthreaded shank sections to bear shear loads, enhancing joint stability in structural applications.
• Broad industrial compliance meeting ASME B18.2.1 standards, RoHS 3, and REACH regulations for safe, quality-assured use.
• Coarse UNC thread design provides faster installation and better performance in materials like aluminum or soft metals.

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw is engineered to address critical challenges in industrial assembly and construction. The 18-8 Stainless Steel material delivers excellent resistance to rust and oxidation, making it suitable for marine, chemical, and outdoor applications where environmental factors degrade ordinary fasteners. Its partially threaded design ensures that the unthreaded portion can carry shear loads, reducing stress concentration and preventing joint failure in structural frameworks. With an external hex drive and coarse UNC threads, it allows for quick, high-torque installation with common wrenches, streamlining assembly lines and maintenance operations. These features, combined with Class 2A thread fit precision, minimize the risk of stripping and ensure consistent clamping force, providing reliable performance in machinery, equipment manufacturing, and heavy-duty fixtures.

Specification Summary & Compliance

This screw adheres to Class 2A thread fit tolerances for consistent engagement and meets the ASME B18.2.1 standard for dimensional accuracy and mechanical properties. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial uses. The specifications include a 5/16"-18 UNC coarse thread, 3" length with a minimum thread length of 7/8", and a right-hand thread direction, designed for reliable performance in demanding applications.