S-90665A176 5/16"-18 x 3/4" ASTM A574 Alloy Steel 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 demanding applications.
• Corrosion-resistant zinc-plated alloy steel construction extends service life and maintains integrity in harsh industrial environments, minimizing maintenance needs.
• Class 3A thread fit with UNC coarse threads provides superior holding power and vibration resistance, ideal for machinery and equipment assembly.
• Low-profile socket head with 5/32" hex drive allows for easy installation in confined spaces and offers secure torque application without stripping.
• Full threading along the 3/4" length enables versatile fastening depth and consistent grip across various materials.
• Rockwell C39 hardness enhances durability and wear resistance, supporting long-term use in repetitive or high-load scenarios.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety, facilitating global procurement and regulatory acceptance.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening and corrosion in heavy machinery, automotive, and aerospace assemblies. The zinc-plated alloy steel material provides a protective barrier against moisture and chemicals, while the UNC coarse threads and Class 3A fit ensure precise engagement and stability in dynamic environments. The low-profile socket head design allows for flush mounting in tight spaces, reducing protrusion risks and improving safety. With a tensile strength of 140,000 psi, it reliably handles high-stress applications, from engine components to structural frames, offering engineers a dependable solution for maintaining operational integrity and reducing downtime.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse threading with a 5/16"-18 size. It meets ASTM A574 specifications for high-strength fasteners and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability for industrial use.