S-99894A388 3/8"-16 x 4" MS90725-74 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
- High tensile strength of 120,000 psi ensures reliable performance in demanding industrial applications, reducing the risk of fastener failure.
- Cadmium plating provides superior corrosion resistance, extending the screw's service life in harsh environments.
- Grade 5 steel construction with Rockwell C25 hardness offers excellent durability and resistance to wear and deformation.
- Coarse UNC thread with Class 2A fit allows for quick and easy installation while maintaining secure fastening in various materials.
- Partially threaded design and 4" length provide flexibility for applications requiring precise clamping and unthreaded shank sections.
- External hex drive and hex head enable straightforward installation with standard tools, improving assembly efficiency.
- Compliance with MS90725-74, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations for safe, reliable use.
Professional Applications & Engineering Value
This Grade 5 steel hex head screw is engineered to address common industrial challenges, such as vibration loosening and corrosion in heavy-duty assemblies. The 3/8"-16 UNC coarse thread and Class 2A thread fit provide optimal grip in metals and plastics, reducing the need for frequent retightening. With a tensile strength of 120,000 psi and cadmium plating, it excels in machinery, construction, and automotive applications where high strength and corrosion resistance are critical. The partially threaded design allows for precise load distribution, making it ideal for bolted joints that require both clamping and shear strength.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit and UNC coarse thread standards, ensuring dimensional accuracy and interchangeability. It meets MS90725-74 specifications for material and manufacturing quality, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious industrial use.
