S-90357A111 2-56 x 3/16" Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength (140,000 psi) ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Precision Class 3A thread fit guarantees superior engagement and vibration resistance, minimizing loosening in critical assemblies.
• Ultra-low socket head profile allows installation in confined spaces where standard head heights are prohibitive, increasing design flexibility.
• Black-oxide finish on alloy steel provides enhanced corrosion resistance and a durable, non-galling surface for extended service life.
• Coarse UNC thread form enables quicker assembly and reduced cross-threading risk compared to fine threads, improving installation efficiency.
• Consistent Rockwell C32 hardness maintains dimensional stability and wear resistance, ensuring repeatable performance in automated or high-cycle applications.
• Full compliance with RoHS 3 and REACH meets international environmental and safety standards, supporting use in regulated industries.

Professional Applications & Engineering Value

Engineered for precision-driven industries, these socket head cap screws with 2-56 UNC coarse threads and ultra-low profile heads solve critical space and strength challenges in compact assemblies. The black-oxide alloy steel construction combats corrosion while the Class 3A thread fit ensures tight tolerances for vibration-prone environments like robotics, aerospace subassemblies, and medical devices. With a 140,000 psi tensile strength and Rockwell C32 hardness, they provide dependable clamping force in high-load scenarios, reducing maintenance intervals and enhancing operational reliability. The fully threaded design allows uniform stress distribution, making them ideal for securing components in electronic enclosures, machinery plates, and precision instruments where failure is not an option.

Specification Summary & Compliance

This screw adheres to inch system measurements with a 3/16" length and tight length tolerance of -0.005" to 0.005". Thread specifications include UNC coarse thread with Class 3A fit for precision alignment. Manufacturing conforms to material and dimensional standards for alloy steel fasteners, and the product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory acceptance in global markets.