S-92198A238 1 1/4"-7 x 4" 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 reliability.
• Exceptional mechanical strength offering 80,000 psi tensile strength and Rockwell B70 hardness for demanding, heavy-duty applications.
• Reliable and precise fit ensured by Class 2A thread fit, providing consistent engagement and reducing the risk of cross-threading.
• Easy installation and removal with a standard external hex drive and 1 7/8" head width for straightforward tool access and high torque application.
• Optimized for coarse threading (UNC) to resist loosening under vibration and allow for quicker assembly in industrial settings.
• Partial threading design provides unthreaded shank strength where needed, improving clamp load distribution and joint integrity.
• Compliance with major industry standards including ASME B18.2.1, RoHS 3, and REACH, ensuring product quality, safety, and environmental responsibility.

Professional Applications & Engineering Value

This 1 1/4"-7 UNC hex head screw is engineered to address critical fastening challenges in heavy machinery, structural steel, and large-scale industrial assemblies. The 18-8 Stainless Steel material provides excellent resistance to rust and oxidation, making it suitable for outdoor, marine, or chemically exposed environments. Its coarse UNC thread and Class 2A thread fit ensure rapid assembly and reliable performance under dynamic loads and vibration, reducing maintenance needs. The external hex drive and substantial head size allow for high torque application, ensuring tight, secure connections in critical joints. With partial threading, the screw offers enhanced shear strength along the unthreaded portion, preventing joint failure in high-stress applications such as construction, transportation equipment, and heavy manufacturing.

Specification Summary & Compliance

This screw adheres to Class 2A thread fit for consistent dimensional accuracy and assembly ease. It conforms to the ASME B18.2.1 standard for hex head screws and bolts, ensuring interchangeability and reliability. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for industrial use. Key specifications include a 1 1/4"-7 UNC coarse thread, 4" length, Rockwell B70 hardness, and 80,000 psi tensile strength.