S-91771A548 1/4"-20 x 1 3/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with passivated 18-8 stainless steel, ideal for harsh industrial environments and extended service life.
• High tensile strength of 80,000 PSI ensures reliable performance under heavy loads and mechanical stress.
• Precise Class 2A thread fit for smooth installation and secure fastening in demanding applications.
• Fully threaded UNC coarse thread design provides superior grip and vibration resistance in various materials.
• Standard 82° countersink angle allows for flush mounting, reducing protrusion and improving safety.
• Phillips No. 3 drive offers efficient torque transfer and ease of use with common tools.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards.

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head screw is engineered to address critical challenges in industrial settings, such as corrosion, vibration loosening, and high-stress conditions. Made from passivated 18-8 stainless steel, it resists rust and chemical exposure, making it suitable for machinery, automotive assemblies, and outdoor equipment. The coarse thread and fully threaded design enhance holding power in soft materials like wood or plastic, while the flat head with 82° countersink ensures a smooth, secure fit that minimizes snagging. Ideal for applications requiring reliable fastening under dynamic loads, this screw combines durability with ease of installation, reducing maintenance needs and downtime in industrial screws and heavy-duty projects.

Specification Summary & Compliance

This product adheres to Class 2A thread fit for precise dimensional accuracy and smooth assembly. It meets ASME B18.6.3 standards for manufacturing consistency and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.