McMaster-Carr logo
    Filter by
    System of Measurement
    Material
    Washer Type
    Screw Size
    Industrial Info Snippet
    Certification
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Hardness
    Military Specification
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    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)
    1 Product

    Mil. Spec. Washers

    Image of Product. Front orientation. Washers. Mil. Spec. Washers.
    These washers are manufactured and tested to strict U.S. military standards for material and construction. They take the pressure off screws and nuts to protect mounting surfaces.
    Copper
    These have the best conductivity of all our metal washers. They're often used to secure electrical connections inside breaker panels and to fasten components on printed circuit boards. They're also the softest of all our metal washers, so they won't damage screws and nuts. However, copper washers aren't as corrosion resistant as brass washers, and will develop a green patina over time.
    Low-Friction Cadmium-Plated Copper—The plating reduces friction between the washer, fastener, and mounting surface to prevent sticking when tightening and loosening. It also creates a barrier against rust.
    For Screw
    Size
    ID
    OD
    Thk.
    Mil.
    Spec.
    Pkg.
    Qty.
    Pkg.
    Low-Friction Cadmium-Plated Copper
    7/16"
    		0.443"0.683"0.048" to 0.054"AN901-4C1091818A221000000
    Cadmium-Plated Copper Mil. Spec. Washer, Low-Friction, for 7/16" Screw Size, AN901-4C
    Pack of 10In stock
     
    back to top