S-91773A561 1/4"-28 x 1" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under high-stress conditions.
• Precise and secure fastening with Class 2A thread fit and fine UNF threads, ensuring tight, vibration-resistant connections in critical assemblies.
• Efficient installation and removal thanks to the Phillips No. 3 drive and rounded head design, reducing tool slippage and assembly time.
• Full threading along the 1" length provides maximum grip and uniform load distribution, enhancing joint integrity in various applications.
• Compliance with industry standards including ASME B18.6.3, RoHS, and REACH, ensuring safety, quality, and environmental responsibility.
• Versatile right-hand thread direction for standard fastening operations, compatible with a wide range of industrial equipment and components.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 1/4-28 UNF rounded head Phillips screws address common challenges like corrosion, vibration loosening, and assembly efficiency. The 18-8 Stainless Steel material combined with a passivated finish provides excellent resistance to rust and chemical exposure, making them suitable for marine, automotive, and food processing applications. The fine thread and Class 2A fit ensure precise alignment and reduced risk of stripping, while the Phillips drive facilitates quick installation in tight spaces. Ideal for machinery, electronic enclosures, and structural frameworks, these screws deliver long-term reliability and minimize maintenance needs, supporting seamless operations in high-tensile strength environments.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF thread with Class 2A tolerance for accurate fit, fully threaded along a 1" length. It meets ASME B18.6.3 specifications for dimensional consistency and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards without hazardous substances.