S-91771A742 4-48 x 3/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
• High tensile strength of 80,000 psi ensures secure, durable fastening under demanding mechanical loads.
• Precision Class 2A thread fit guarantees consistent engagement and reduces the risk of cross-threading during assembly.
• Standard 82° countersink angle and flat head design allows for flush mounting, minimizing protrusion and improving aesthetics.
• Fully threaded right-hand UNF fine thread provides maximum grip and vibration resistance in precision applications.
• Phillips No. 1 drive offers efficient installation with common tools, reducing assembly time and effort.
• Compliance with ASME B18.6.3, RoHS 3, and REACH ensures adherence to industry standards and environmental safety regulations.

Professional Applications & Engineering Value

This 4-48 UNF flat head Phillips machine screw is engineered to address critical industrial challenges, such as corrosion and mechanical failure in precision assemblies. Made from passivated 18-8 stainless steel, it provides excellent resistance to rust and chemical exposure, making it suitable for applications in electronics, aerospace, and marine equipment. The fully threaded right-hand design with UNF fine threads ensures tight, reliable fastening in materials prone to vibration loosening. Its flat head with an 82° countersink allows for seamless integration into surfaces, reducing snag risks and maintaining a clean profile. Ideal for high-strength, corrosion-resistant fastening, this screw supports efficient production and long-term performance in demanding environments.

Specification Summary & Compliance

This screw features a Class 2A thread fit for precise dimensional accuracy and smooth assembly, adhering to ASME B18.6.3 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material sustainability. Key specifications include a 3/8" length, Rockwell B80 hardness, and 80,000 psi tensile strength, providing reliable performance in industrial fastener applications.