S-91251A645 3/8"-16 x 5 3/4" 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.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, minimizing loosening in machinery and equipment.
• Coarse UNRC threads enable quick and easy installation, saving time during assembly and maintenance operations.
• Hex socket drive design allows for high torque application with standard tools, ensuring tight fastening in confined spaces.
• Partially threaded shank offers optimal grip and alignment, enhancing joint integrity in structural and heavy-duty assemblies.
• Compliance with RoHS 3 and REACH ensures environmental safety and regulatory acceptance for global supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Black-Oxide Alloy Steel Socket Head Cap Screw addresses critical challenges in machinery, automotive, and construction sectors. The alloy steel construction with Rockwell C37 hardness provides excellent wear resistance, while the coarse 3/8"-16 thread and Class 3A fit ensure rapid, reliable fastening even in high-vibration environments. The hex drive and standard socket head profile facilitate efficient installation with common tools, reducing assembly time and labor costs. Ideal for securing components in equipment frames, hydraulic systems, and structural supports, this screw delivers consistent performance where high tensile strength and durability are paramount, supporting operational efficiency and minimizing downtime.

Specification Summary & Compliance

This screw adheres to ASTM A574 specifications, with precise Class 3A thread fit and coarse UNRC thread type ensuring dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, confirming its suitability for environmentally regulated markets. Manufactured in the inch system, it features a 5 3/4" length and partially threaded rod type for consistent performance in industrial fastening applications.