S-91309A550 1/4"-20 x 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 that protects against rust and extends service life in harsh environments
• High tensile strength of 60,000 psi ensures reliable load-bearing capacity and prevents failure under stress
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
• Class 2A thread fit offers consistent, reliable engagement for easier assembly and reduced cross-threading risks
• Fully threaded design allows for maximum grip and uniform clamping force along the entire length
• External hex drive and hex head enable quick, secure installation with standard tools, reducing assembly time
• Compliance with RoHS 3 and REACH ensures environmental safety and meets global regulatory standards for industrial use

Professional Applications & Engineering Value

These 1/4"-20 x 2" steel hex head screws are engineered to address common industrial challenges such as vibration loosening, corrosion, and high-stress fatigue. The UNC coarse thread design ensures rapid assembly and strong holding power in materials like metal, wood, and plastic, making them ideal for machinery, structural frameworks, and heavy-duty equipment. The zinc-plated finish provides a protective barrier against moisture and chemicals, significantly reducing maintenance needs and downtime. Manufactured from ASTM A307 steel, these screws deliver consistent performance in demanding environments, from construction to automotive applications, ensuring long-term reliability and cost efficiency.

Specification Summary & Compliance

This product adheres to Class 2A thread fit tolerances for precise, reliable threading. It meets ASME B18.2.1 specifications and is manufactured in compliance with ASTM A307 standards. Additionally, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for global industrial use.