S-99894A217 5/16"-18 x 2" MS90725-40 Mil. Spec. Medium-Strength Steel Hex Head Screws
Mil. Spec. Medium-Strength Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior load-bearing capability with 120,000 psi tensile strength for reliable performance in demanding applications
- Enhanced corrosion resistance through cadmium plating, extending service life in harsh industrial environments
- Optimized thread engagement with Class 2A thread fit ensuring smooth assembly and consistent clamping force
- Robust material integrity from Grade 5 steel with Rockwell C25 hardness for excellent wear resistance
- Secure external hex drive allowing high torque application and preventing tool slippage during installation
- Versatile partial threading providing both gripping strength and clearance where needed
- Industry-standard compliance meeting MS90725-40 specifications for guaranteed quality and interchangeability
Professional Applications & Engineering Value
These Grade 5 hex head screws deliver exceptional engineering value through their cadmium plated surface treatment that combats oxidation in industrial settings. The 5/16"-18 UNC coarse thread configuration ensures rapid installation and reliable performance in soft materials or where vibration resistance is critical. With partial threading and external hex drive, these fasteners provide optimal clamp load distribution while allowing for high-torque installation in confined spaces. The combination of 120,000 psi tensile strength and Rockwell C25 hardness makes them ideal for structural assemblies, machinery frames, and heavy equipment where industrial strength screws must withstand dynamic loads without compromising joint integrity.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent mating with nuts and tapped holes. The coarse UNC thread form (5/16"-18) follows standardized thread geometry for reliable performance. These hex head screws comply with MS90725-40 specifications and are produced from Grade 5 steel meeting applicable material standards. The cadmium plating provides corrosion protection while maintaining electrical conductivity where required.
