McMaster-Carr logo
    Filter by
    Military Specification
    System of Measurement
    Thread Size
    Industrial Info Snippet
    Fastener Strength Grade/Class
    Industrial Info Snippet
    Material
    Width
    Attribute Image
    Nut Type
    Thread Type
    Performance
    Hex Nut Profile
    Thread Direction
    Height
    Attribute Image
    Certification
    Fastener Strength Rating
    Thread Spacing
    Industrial Info Snippet
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    DFARS Specialty Metals
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    2 Products
    About Hex Nuts
    industrial info icon

    Choose a hex nut with the right profile, material, and strength for your application.

    Mil. Spec. Hex Nuts

    These nuts are manufactured and tested to strict U.S. military standards for material and construction.
    High-Strength Steel
    Image of Product. Front orientation. Hex Nuts. Mil. Spec. Hex Nuts.
    Rated Grade 8, Grade C, or Class 10, these nuts are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten components in valves, pumps, motors, and other high-stress applications. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.
    Cadmium Yellow-Chromate-Plated Steel— The plating creates a barrier against rust, so these nuts are suitable for most wet and outdoor environments. They also thread on smoothly without sticking.
    Thread
    Size
    Wd.
    Ht.
    Mil. Spec.
    Fastener Strength
    Grade/Class
    Pkg.
    Qty.
    Pkg.
    Black-Oxide Steel
    5/16"-24
    		1/2"17/64"Fed. Spec. FF-N-836, MS51968-6SAE Grade 8
    		594191A11400000
     
    Cadmium Yellow-Chromate-Plated Steel
    5/16"-24
    		1/2"17/64"Fed. Spec. FF-N-836, MS51968-6SAE Grade 8
    		2594191A25000000
     
    back to top