S-92198A117 1/4"-28 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 reliability.
• High tensile strength of 80,000 psi ensures dependable performance under significant load and stress in industrial assemblies.
• Fine UNF threading (1/4"-28) provides a tighter, more secure fit compared to coarse threads, reducing the risk of loosening.
• Class 2A thread fit offers consistent, easy assembly while maintaining precision for reliable fastening.
• External hex drive and hex head design allows for high torque application with standard tools, speeding up installation and removal.
• Partial threading gives greater control over clamp load, making it perfect for applications where unthreaded shank strength is critical.
• Compliance with ASME B18.2.1, RoHS 3, and REACH ensures product quality, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This 1/4"-28 UNF hex head screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in demanding settings. Made from 18-8 Stainless Steel, it provides excellent resistance to rust and chemical exposure, making it suitable for outdoor equipment, marine hardware, and food processing machinery. The fine thread and Class 2A fit enhance grip in thin materials and soft metals, reducing the need for frequent retightening. With an external hex drive, it supports high-torque applications in confined spaces, ensuring quick and secure installations. Its partial threading design offers superior shear strength, ideal for structural assemblies where the unthreaded portion must bear heavy loads without compromising thread integrity.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF fine thread with Class 2A thread fit for precise dimensional accuracy. It meets ASME B18.2.1 manufacturing specifications, ensuring consistency and reliability. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for hazardous substance restrictions.