S-91773A552 1/4"-20 x 2 1/2" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and a passivated finish, ensuring long-term reliability in harsh environments.
• High tensile strength of 100,000 psi provides exceptional load-bearing capacity for demanding heavy-duty applications.
• Rockwell B100 hardness offers excellent durability and resistance to wear, extending the screw's service life.
• Coarse UNC thread (1/4"-20) with Class 2A fit enables quick and secure installation, reducing assembly time and improving efficiency.
• Partially threaded design allows for precise clamping force control, ideal for applications where specific grip range is critical.
• Phillips No. 3 drive ensures common tool compatibility and reduces cam-out risk for smoother, more reliable fastening.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees consistent quality, safety, and environmental responsibility for industrial use.

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw is engineered to address common industrial challenges such as corrosion-induced failure and inconsistent fastening performance. Its passivated finish significantly enhances resistance to oxidation and chemical exposure, making it ideal for outdoor equipment, marine hardware, and chemical processing facilities. The coarse UNC thread and Class 2A thread fit ensure reliable engagement in various materials, reducing the risk of cross-threading and improving assembly speed. With a high tensile strength of 100,000 psi and Rockwell B100 hardness, it provides dependable performance in structural applications, machinery assembly, and heavy-duty fastening where vibration and dynamic loads are concerns. The partially threaded shank allows for optimal clamp load distribution, preventing joint loosening over time.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy and reliable performance. It is manufactured in compliance with ASME B18.6.3 standards, ensuring consistent quality and interchangeability. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements for industrial use.