S-91236A554 1/4"-20 x 3" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 60,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Zinc plating provides superior corrosion resistance, extending the screw's service life in harsh industrial environments.
• UNC coarse threading and Class 2A thread fit offer faster assembly and a secure, vibration-resistant connection.
• External hex drive and hex head design allow for high torque application with common tools, simplifying installation and removal.
• Rockwell B69 hardness provides excellent durability and resistance to wear, maintaining integrity under repeated stress.
• Partial threading allows for unthreaded shank sections, ideal for applications requiring precise clamping force.
• Compliance with ASME B18.2.1, ASTM A307, RoHS 3, and REACH guarantees consistent quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 1/4"-20 x 3" steel hex head screw is engineered to address common industrial fastening challenges, such as joint loosening due to vibration and corrosion in outdoor or humid settings. The UNC coarse thread and Class 2A fit ensure quick, reliable engagement in a variety of materials, reducing assembly time while providing a secure hold. The zinc-plated finish significantly enhances corrosion resistance, making it suitable for machinery, structural frameworks, and equipment exposed to moderate environmental conditions. With a 60,000 psi tensile strength and Rockwell B69 hardness, it delivers consistent performance in heavy-duty applications like construction, automotive assembly, and industrial manufacturing, where failure is not an option. Its compliance with ASME B18.2.1 and material standards ensures interoperability and reliability across projects.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy and ease of use. It is manufactured in accordance with ASME B18.2.1 and ASTM A307 specifications, ensuring consistent quality and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible procurement and use in global markets.