S-91355A152 4-40 x 3/16" Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional Durability: Crafted from black-oxide alloy steel with a Rockwell C32 hardness, offering superior resistance to wear and corrosion in demanding industrial environments.
• High Tensile Strength: Withstands up to 120,000 psi tensile strength, ensuring reliable performance under high-stress conditions without failure.
• Precision Thread Fit: Features a Class 3A thread fit for tight, secure fastening with minimal backlash, enhancing assembly accuracy and vibration resistance.
• Efficient Installation: Equipped with a hex drive (1/16") and fully threaded 4-40 UNC coarse thread design for quick, tool-friendly installation and strong grip in various materials.
• Enhanced Stability: Includes an integrated flange that distributes load evenly, reducing the risk of loosening and providing a wider bearing surface for secure attachments.
• Right-Hand Coarse Threading: The coarse thread spacing and right-hand direction allow for rapid assembly and disassembly, ideal for applications requiring frequent maintenance.
• Regulatory Compliance: Fully compliant with RoHS 3 and REACH standards, ensuring environmental safety and suitability for global industrial supply chains.

Professional Applications & Engineering Value

This 4-40 UNC threaded rounded head screw is engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in harsh environments. The black-oxide alloy steel construction provides a protective layer that minimizes oxidation, extending service life in applications like machinery assembly, automotive components, and electronic enclosures. Its Class 3A thread fit ensures precise engagement with mating parts, reducing the need for re-tightening and enhancing overall system reliability. The flanged design and hex drive facilitate easy installation with standard tools, speeding up production lines while maintaining a secure hold. Ideal for industrial fastening where high strength and compliance with environmental regulations are critical, this screw delivers consistent performance in coarse thread applications, supporting efficient maintenance and long-term durability.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC coarse threading (4-40 size) with a length of 3/16". It meets manufacturing specifications for Rockwell C32 hardness and 120,000 psi tensile strength, ensuring reliability in high-stress environments. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free from hazardous substances, making it suitable for diverse industrial and export markets.