S-91255A527 1/4"-20 x 1 5/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress applications without failure.
• Precision Class 3A thread fit guarantees secure, vibration-resistant connections, reducing maintenance needs.
• Fully threaded UNC coarse design allows for faster installation and stronger holding power in various materials.
• Hex drive (5/32") compatibility enables easy, high-torque installation with standard tools, minimizing assembly time.
• Rounded button head profile provides a low-profile, aesthetically clean finish while preventing snagging.
• Compliance with ASME, ASTM, RoHS, and REACH ensures safety, environmental responsibility, and global regulatory acceptance.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Black-Oxide Alloy Steel Rounded Head Screw delivers outstanding durability and reliability. The Rockwell C39 hardness and 120,000 psi tensile strength make it ideal for high-stress environments like machinery assembly, automotive systems, and construction equipment, where failure is not an option. Its fully threaded UNC coarse spacing and Class 3A precision fit ensure quick, secure fastening in metals and composites, reducing loosening from vibrations. The black-oxide surface treatment enhances corrosion resistance, prolonging lifespan in harsh conditions. This screw solves common engineering challenges by providing a robust, compliant fastener that meets rigorous ASME B18.3 and ASTM F835 standards, ensuring consistent performance and reducing downtime in critical operations.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with Class 3A fit and coarse spacing for precise, reliable engagement. It adheres to ASME B18.3 and ASTM F835 manufacturing specifications, ensuring dimensional accuracy and performance consistency. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety standards for global use. The inch system measurements, including a length of 1 5/8" and head diameter of 0.437", support seamless integration in standardized assemblies.