S-90357A145 5/16"-18 x 1/2" Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for long-term use.
• Ultra-low socket head profile allows installation in confined spaces while maintaining high torque capability with a 5/32" hex drive.
li>Coarse 5/16"-18 UNC threading enables quick assembly and disassembly, improving efficiency in maintenance and production lines.
• Strict dimensional control with length tolerance of ±0.005" ensures consistent fit and alignment in precision assemblies.
• Full compliance with RoHS 3 and REACH regulations guarantees environmental safety and global market acceptability.

Professional Applications & Engineering Value

Engineered for demanding environments, this black-oxide alloy steel socket head cap screw combines high tensile strength and Rockwell C32 hardness to withstand heavy loads and repetitive stress. The ultra-low profile head and 5/16"-18 UNC coarse thread design address common challenges in machinery, automotive, and aerospace sectors where space constraints and rapid assembly are critical. Its Class 3A thread fit ensures tight tolerances, reducing backlash and enhancing joint integrity in vibrating systems. Ideal for securing components in jigs, fixtures, and engine parts, this screw delivers reliable fastening performance while meeting stringent industry standards for durability and precision.

Specification Summary & Compliance

This socket head cap screw adheres to inch system measurements with a thread diameter of 0.312" and length of 1/2" (±0.005" tolerance). It features UNC coarse threading with a Class 3A fit for precise engagement, manufactured from alloy steel with a black-oxide finish. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted substances and suitable for global industrial use.