S-91236A722 1/2"-13 x 2 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in demanding environments
• High tensile strength of 60,000 PSI ensures reliable performance under heavy loads and vibration
• Class 2A thread fit provides consistent engagement and easier assembly without compromising holding power
• Partially threaded design allows for precise clamping force control and reduced thread galling
• External hex drive and hex head enable high-torque installation with standard tools for efficient maintenance
• Coarse UNC threads offer faster installation and better performance in softer materials or where debris is present
• Rockwell B69 hardness maintains thread integrity and resistance to wear over repeated use

Professional Applications & Engineering Value

This 1/2"-13 UNC hex head screw is engineered to address critical fastening challenges in industrial applications such as machinery assembly, structural frameworks, and heavy equipment. The zinc plated steel construction provides a durable barrier against rust and corrosion, essential for outdoor or high-moisture environments. Its partially threaded configuration ensures that unthreaded shank sections bear directly against connected parts, distributing load efficiently and preventing loosening under dynamic stresses. With a coarse thread profile, it resists cross-threading and allows for quicker installations, reducing labor time in production or maintenance settings. Compliant with ASME B18.2.1, this screw delivers consistent dimensional accuracy and reliability, making it a trusted choice for engineers and procurement specialists seeking high-strength fastening solutions that meet rigorous industry standards.

Specification Summary & Compliance

This hex head screw adheres to precise Class 2A thread fit tolerances per UNC standards, ensuring optimal thread engagement and interchangeability. Manufactured in accordance with ASME B18.2.1 and material specifications meeting ASTM A307, it guarantees dimensional consistency and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting sustainable procurement practices in global supply chains.