S-92562A115 4-40 x 1/4" MS16997-9, NAS1352-04-4P Mil. Spec. Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 160,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from cadmium plating extends service life in harsh or outdoor industrial environments.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections with minimal risk of loosening.
• High hardness (Rockwell C39) provides excellent wear resistance, maintaining thread integrity through repeated use.
• Hex socket drive design allows for easy installation and removal in confined spaces with standard tools.
• Fully threaded coarse UNRC design enables quick assembly and strong holding power in various materials.
• Compliance with MS16997-9 NAS1352-04-4P ensures consistent quality and interchangeability for aerospace and defense applications.

Professional Applications & Engineering Value

This 4-40 thread socket head cap screw is engineered to solve critical fastening challenges in demanding sectors like aerospace, automotive, and heavy machinery. The cadmium-plated alloy steel construction combats corrosion and oxidation, while the Class 3A thread fit and coarse UNRC threads provide superior resistance to vibration loosening—a common failure point in dynamic assemblies. With a 160,000 psi tensile strength and Rockwell C39 hardness, it withstands extreme mechanical loads and repetitive stress, making it ideal for engine components, structural frames, and precision equipment where reliability is non-negotiable. The fully threaded right-hand design ensures maximum grip length, enhancing stability in thin or layered materials.

Specification Summary & Compliance

This socket head cap screw adheres to inch system dimensions with a 1/4" length and 4-40 thread size. It features a Class 3A thread fit per UNRC standards, ensuring tight tolerances for high-precision applications. The screw conforms to MS16997-9 where identified as NAS1352-04-4P, meeting rigorous aerospace and defense specifications for material quality, performance, and traceability. It is manufactured from cadmium-plated alloy steel, complying with industry standards for mechanical properties and surface treatment.