S-92198A178 1 1/8"-7 x 8" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance provided by 18-8 Stainless Steel, ensuring long-term reliability in harsh or outdoor environments.
• High tensile strength of 80,000 psi delivers superior load-bearing capacity for demanding structural and heavy machinery applications.
• Rockwell B70 hardness offers excellent resistance to wear and deformation, maintaining fastener integrity under stress.
• Coarse UNC thread and Class 2A fit enable faster installation and reliable engagement, even in materials where fine threads might strip.
• External hex drive and large 1 11/16" head width provide a secure grip for high-torque tightening with standard tools, reducing installation time.
• Partial threading allows for precise clamping force control, ideal for applications where unthreaded shank strength is critical.
• Full compliance with ASME B18.2.1, RoHS 3, and REACH ensures consistent quality, safety, and environmental responsibility for global industrial use.

Professional Applications & Engineering Value

This heavy-duty hex head screw is engineered to solve critical challenges in construction, machinery assembly, and infrastructure projects. The 18-8 Stainless Steel composition provides inherent corrosion resistance, eliminating premature failure in moist or chemical-exposed settings. Its coarse 1 1/8"-7 UNC thread and Class 2A thread fit ensure rapid, secure fastening in steel frames, heavy equipment, and structural supports, reducing assembly time while preventing loosening under vibration. The partial threading design concentrates clamping force, making it ideal for dynamic load applications where shear strength is paramount. By meeting ASME B18.2.1 specifications, this fastener guarantees dimensional consistency and interoperability, essential for maintenance and OEM part replacement.

Specification Summary & Compliance

This screw features a 1 1/8"-7 UNC coarse thread with Class 2A thread fit for standard inch-system applications, ensuring precise dimensional accuracy per ASME B18.2.1. It is manufactured from 18-8 Stainless Steel with a tensile strength of 80,000 psi and Rockwell B70 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use.