S-91773A557 1/4"-28 x 1/2" 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
• High tensile strength of 100,000 psi ensures reliable, long-lasting fastening under demanding loads
• Precise Class 2A fine thread fit provides smooth engagement and reduces the risk of cross-threading
• Fully threaded design offers maximum grip and holding power along the entire screw length
• Rockwell B100 hardness maintains thread integrity and resists wear during installation and use
• Phillips No. 3 drive with rounded head allows for efficient installation and a clean, finished appearance
• Compliance with ASME B18.6.3, RoHS, and REACH guarantees quality, safety, and environmental standards are met

Professional Applications & Engineering Value

These 1/4"-28 UNF rounded head Phillips screws are engineered to solve critical fastening challenges in industrial and mechanical assemblies. The 18-8 stainless steel material combined with a passivated finish provides exceptional resistance to oxidation and chemical exposure, making them suitable for applications in marine, food processing, and outdoor equipment where corrosion resistance is paramount. The fine thread and Class 2A fit ensure tight, secure connections in precision components, reducing the likelihood of loosening under vibration. With a fully threaded design and high tensile strength, these screws deliver consistent clamping force and durability, supporting reliable performance in industrial fasteners for machinery, enclosures, and structural frameworks.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF fine thread with Class 2A thread fit for precise dimensional accuracy, manufactured in accordance with ASME B18.6.3 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety requirements.