S-90357A142 5/16"-18 x 1/4" Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in critical applications.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic industrial environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish suitable for harsh operating conditions.
• Ultra-low socket head profile allows installation in confined spaces where standard head height is prohibitive, increasing design flexibility.
• Coarse UNC threads enable quicker assembly and disassembly, saving valuable time in maintenance and production workflows.
• Fully threaded design ensures consistent clamping force along the entire length, providing uniform load distribution.
• Compliance with RoHS 3 and REACH regulations guarantees environmental safety and meets international standards for industrial use.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these socket head cap screws combine black-oxide alloy steel with a Class 3A UNC thread to address common challenges like space constraints and vibration-induced loosening. The ultra-low profile head and coarse threading facilitate rapid installation in tight assemblies, such as machinery frames, automotive components, and precision equipment, where access is limited. With high tensile strength and Rockwell C32 hardness, they withstand heavy loads and repetitive stress, reducing maintenance downtime. The black-oxide surface treatment adds a layer of corrosion resistance, extending service life in humid or abrasive environments, making them ideal for OEM and MRO applications that prioritize durability and efficiency.

Specification Summary & Compliance

This screw adheres to inch system dimensions, including a 5/16"-18 UNC coarse thread with Class 3A fit for precise tolerance control (length tolerance: -0.005" to 0.005"). Manufactured from alloy steel, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental and safety regulations are fulfilled for industrial fastener use.