S-91247A568 1/4"-20 x 7" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With a 120,000 psi rating, this Grade 5 screw withstands high-stress loads, reducing the risk of failure in demanding applications.
• Superior Corrosion Resistance – Zinc plating provides a durable barrier against rust, extending service life in harsh industrial or outdoor environments.
• Reliable Thread Engagement – UNC coarse threads and Class 2A fit ensure easy installation and secure fastening, minimizing cross-threading and assembly time.
• High Hardness for Durability – Rockwell C25 hardness offers excellent wear resistance, maintaining structural integrity under repeated use.
• Optimized for Heavy-Duty Use – The 7-inch length and partially threaded design provide flexibility for applications requiring both clamping and unthreaded shank strength.
• Broad Industrial Compliance – Meets ASME B18.2.1 and SAE J429 standards, ensuring consistent quality and interchangeability in professional settings.
• Environmental and Safety Assurance – RoHS 3 and REACH compliance guarantees safe use, free from hazardous substances, aligning with global regulatory demands.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial, construction, and automotive applications, this Grade 5 hex head screw addresses critical challenges like vibration loosening and material fatigue. The zinc-plated steel finish combats corrosion in exposed settings, while the UNC coarse thread and external hex drive enable quick, tool-friendly installation with standard wrenches. Its partially threaded 7-inch design allows the unthreaded shank to bear shear loads effectively, making it ideal for structural assemblies, machinery frames, and vehicle components where high tensile strength and long-term reliability are paramount. By adhering to ASME B18.2.1 specifications, it ensures precise dimensional consistency, reducing downtime and replacement costs in professional operations.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with Class 2A fit for standard tolerance and easy assembly. It complies with ASME B18.2.1 and SAE J429 Grade 5 standards, guaranteeing mechanical properties and dimensional accuracy. Environmental adherence includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free from restricted substances. The inch system measurements, right-hand thread direction, and specified material properties ensure consistent performance across regulated industrial uses.