S-92562A612 1/4"-28 x 1 3/4" MS16998-48, NAS1351-4-28P 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.
• Cadmium-plated alloy steel construction provides superior corrosion resistance, extending service life in harsh industrial environments.
• Class 3A thread fit guarantees precise, tight-tolerance engagement for secure, vibration-resistant assemblies.
• Fine thread spacing (UNRF) offers improved adjustment accuracy and better load distribution compared to coarse threads.
• Partially threaded rod design allows for unthreaded shank sections, providing enhanced shear strength and precise clamping control.
• Rockwell C39 hardness delivers excellent wear resistance, maintaining thread integrity through repeated installations.
• Hex socket drive enables high-torque installation with standard tools, minimizing stripping and ensuring efficient assembly.

Professional Applications & Engineering Value

Engineered for demanding applications, these socket head cap screws solve critical challenges in machinery, aerospace, and heavy equipment assembly. The cadmium-plated alloy steel provides a durable barrier against corrosion, essential for outdoor or chemically exposed environments. The UNRF fine thread design ensures superior vibration resistance, preventing loosening in dynamic systems. With a partially threaded configuration, the screw offers a non-threaded bearing surface that increases shear strength and prevents thread damage during clamping. This combination of high tensile strength and precision thread fit makes it ideal for high-stress connections where reliability and repeatability are paramount.

Specification Summary & Compliance

This fastener adheres to Class 3A thread fit for high-precision applications, ensuring tight tolerances and secure mating. It conforms to MS16998-48 specifications, equivalent to NAS1351-4-28P, meeting rigorous aerospace and defense standards. The 1/4"-28 UNRF fine thread and right-hand thread direction comply with unified screw thread standards. Manufacturing follows industry best practices for dimensional accuracy, and the cadmium plating aligns with common industrial surface treatment requirements, though specific RoHS/REACH compliance should be verified per batch.