S-99894A209 5/16"-18 x 1 1/2" MS90725-38 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
- Exceptional tensile strength of 120,000 psi provides reliable load-bearing capacity for demanding industrial applications
- Superior corrosion resistance through cadmium plating extends service life in harsh environments
- Precise Class 2A thread fit ensures smooth assembly and consistent performance in repetitive applications
- Grade 5 steel construction with Rockwell C25 hardness delivers optimal balance of strength and durability
- UNC coarse threading enables faster installation and reduced cross-threading risks
- External hex drive design allows for high-torque applications with standard tools
- Partial threading provides unthreaded shank section for enhanced shear strength where needed
Professional Applications & Engineering Value
This Grade 5 steel hex head screw delivers critical engineering solutions for industrial assembly challenges. The cadmium plating provides essential corrosion protection in manufacturing environments where exposure to moisture and chemicals is common. The UNC coarse thread design combined with Class 2A fit ensures reliable engagement in structural applications, reducing the risk of thread stripping during high-torque installation. The partially threaded configuration offers distinct advantages in applications requiring precise clamping force distribution, making it ideal for machinery assembly, structural steel connections, and heavy equipment manufacturing where vibration resistance and long-term reliability are paramount.
Specification Summary & Compliance
Manufactured to exacting standards with Class 2A thread fit tolerance for consistent performance. Features UNC coarse thread (5/16"-18) with right-hand orientation and meets MS90725-38 specification requirements. The fastener maintains dimensional accuracy with 1 1/2" length, 1/2" head width, and 13/64" head height. Grade 5 classification ensures compliance with industrial strength standards, while the cadmium plating provides environmental protection in accordance with industrial fastener specifications.
