S-92186A555 1/4"-20 x 3 1/4" ASME B18.2.1 Super-Corrosion-Resistant 316 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh industrial and marine environments
• Exceptional tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
• Optimized partial threading provides secure fastening while reducing material usage and weight
• Precision Class 2A thread fit guarantees consistent engagement and prevents cross-threading during installation
• External hex drive design allows for high-torque application with standard tools, speeding up assembly processes
• Rockwell B70 hardness rating maintains thread integrity and prevents stripping in demanding applications
• Comprehensive compliance with ASME B18.2.1, RoHS 3, and REACH ensures quality and environmental responsibility

Professional Applications & Engineering Value

This 1/4"-20 UNC hex head screw delivers critical performance advantages in demanding industrial settings where corrosion resistance and structural integrity are paramount. The 316 stainless steel composition provides exceptional protection against chemical exposure and saltwater environments, making it ideal for marine equipment, chemical processing plants, and offshore applications. The coarse UNC thread design ensures rapid installation and superior holding power in various materials, while the partially threaded configuration concentrates clamping force precisely where needed. With its external hex drive and robust 3-1/4" length, this fastener solves common challenges of vibration loosening and material degradation, offering engineers a reliable solution for structural assemblies, machinery mounting, and heavy-duty equipment maintenance where long-term performance is essential.

Specification Summary & Compliance

This hex head screw features precision Class 2A thread fit with 1/4"-20 UNC coarse threading and right-hand direction. Manufacturing complies with ASME B18.2.1 specifications, ensuring dimensional accuracy and interchangeability. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) requirements for chemical safety, making it suitable for regulated industries and international markets.