S-90128A246 1/4"-20 x 7/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Zinc-plated alloy steel construction provides superior corrosion resistance, extending service life in demanding industrial environments.
• Class 3A thread fit offers precise, tight tolerances for secure fastening and vibration resistance in critical assemblies.
• UNC coarse threads enable quick installation and reduced cross-threading, saving time during assembly and maintenance.
• Hex socket drive design allows for high torque application with standard tools, ensuring firm seating and easy access in confined spaces.
• Full threading along the 7/8" length provides maximum grip and adjustability, accommodating various material thicknesses.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial use.

Professional Applications & Engineering Value

This zinc-plated alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and corrosion in machinery, automotive, and heavy equipment applications. The UNC coarse thread design with Class 3A fit ensures rapid, secure assembly while minimizing thread damage, ideal for repetitive disassembly in maintenance-heavy environments. With a Rockwell C37 hardness and robust 170,000 PSI tensile strength, it withstands extreme mechanical stresses, providing long-term reliability in structural frames, engine components, and precision instruments. The hex drive socket head facilitates efficient installation with standard wrenches, reducing labor time and enhancing operational efficiency in B2B settings where downtime is costly.

Specification Summary & Compliance

This socket head cap screw features precise UNC 1/4"-20 coarse threads with a Class 3A thread fit for accurate dimensional control. It meets ASTM A574 specifications for high-strength alloy steel fasteners, ensuring consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use worldwide.