S-90585A542 1/4"-20 x 1" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh environments and extended service life.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing in demanding applications.
• Precise, secure fastening ensured by the Class 3A thread fit and UNC coarse thread, reducing the risk of cross-threading and loosening.
• Efficient installation and flush finish with a standard 82° countersink angle and hex drive (5/32"), allowing for a clean, recessed appearance.
• Full threading for maximum grip along the entire 1" length, providing consistent holding power across the fastened materials.
• Regulatory compliance and quality assurance meeting ASME B18.3 standards, RoHS 3, and REACH, ensuring safety and environmental responsibility.
• Dimensional reliability with controlled head diameter and right-hand thread direction for consistent performance in inch-system assemblies.

Professional Applications & Engineering Value

This 1/4"-20 UNC Flat Head Screw is engineered to address critical challenges in industrial settings where corrosion resistance and structural integrity are paramount. Constructed from 316 Stainless Steel and enhanced with a passivated finish, it excels in aggressive environments such as marine, chemical processing, and outdoor infrastructure, preventing rust and degradation. The Class 3A thread fit and coarse UNC threading facilitate quick, secure assembly, minimizing installation errors and vibration-induced failures. With a flat head design and 82° countersink angle, it provides a smooth, flush surface ideal for machinery, panels, and fixtures requiring aerodynamic or aesthetic finishes. The hex drive ensures high torque application, making it a reliable choice for heavy-duty applications demanding durability and precision.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including a head diameter of 0.531" with specified tolerance and a Class 3A thread fit for superior engagement. It conforms to ASME B18.3 standards for consistency and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it meets strict environmental and safety regulations for hazardous substances.