S-99894A640 3/4"-10 x 3" MS90725-191 Mil. Spec. Medium-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with cadmium plating, extending service life in harsh industrial environments
• High tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration
• Grade 5 steel construction provides excellent durability and Rockwell C25 hardness for repeated use
• Coarse UNC threading allows for faster installation and better grip in softer materials
• External hex drive design enables easy tightening with standard tools, reducing assembly time
• Class 2A thread fit guarantees precise, consistent engagement for secure fastening
• Partially threaded shank offers optimal clamping force distribution in structural applications

Professional Applications & Engineering Value

This 3/4"-10 UNC Grade 5 steel hex head screw is engineered to address critical fastening challenges in demanding sectors like construction, machinery assembly, and heavy equipment manufacturing. The cadmium plating significantly enhances corrosion resistance, preventing premature failure in exposed or humid conditions. Its coarse thread design ensures rapid installation and superior holding power in wood, steel, and composite materials, reducing labor costs. The partially threaded configuration concentrates clamping force where needed, minimizing stress concentration. With a 120,000 psi tensile strength and Rockwell C25 hardness, it withstands high dynamic loads and repetitive stresses, making it ideal for structural connections, industrial frames, and automotive components that require dependable, long-term performance.

Specification Summary & Compliance

This fastener features a 3/4"-10 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy and consistent performance. It complies with MS90725-191 specifications, ensuring adherence to established industrial standards for material quality, threading, and mechanical properties. The Grade 5 classification confirms its high-strength capabilities, while the cadmium-plated finish meets common industry requirements for corrosion protection. Manufactured to provide reliable performance in rigorous applications, this screw is suitable for use in assemblies where compliance with recognized engineering standards is essential for safety and durability.