S-92210A572 1/4"-28 x 1 3/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for high-stress applications.
• Precise, reliable fastening ensured by Class 3A fine threading (1/4"-28 UNF) for superior thread engagement and vibration resistance.
• Efficient, flush installation with a standard 82° countersink angle and flat head design for a smooth, aerodynamic surface finish.
• Secure, high-torque driving enabled by the 5/32" hex drive, preventing cam-out and ensuring easy installation with standard tools.
• Full-length threading provides consistent holding power along the entire 1 3/4" length for versatile and robust connections.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This 1/4"-28 UNF flat head screw is engineered to solve critical fastening challenges in demanding industrial applications. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to oxidation and chemical exposure, making it ideal for machinery, automotive assemblies, and outdoor equipment where durability is paramount. The Class 3A fine threading ensures a tight, secure fit that minimizes loosening under vibration, while the 82° countersink angle allows for a flush mount in precision components. With a fully threaded design and 70,000 psi tensile strength, it delivers reliable performance in high-stress environments, reducing maintenance needs and enhancing operational safety. These screws are commonly used in aerospace, electronics, and heavy machinery where precision and compliance with standards like ASME B18.3 are essential.

Specification Summary & Compliance

This product features precise Class 3A threading with a 1/4"-28 UNF fine thread and a right-hand thread direction, ensuring high accuracy and fit. It complies with ASME B18.3 manufacturing specifications for dimensional consistency. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, confirming it is free from hazardous substances and suitable for global industrial use.