McMaster-Carr logo
    Filter by
    System of Measurement
    Washer Type
    Specifications Met
    Washer Designation
    Application
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Compare
    DFARS Specialty Metals
    Industrial Info Compare
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Construction
    Maximum Temperature
    Filler Material
    Color
    Food Industry Standard
    Minimum Temperature
    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)
    Help me decide (beta)
    9 Products

    Sealing Washers

    Prevent leaks while distributing weight evenly under nuts and screws. These washers compress as you tighten to keep air and fluid in, and dust and contaminants out. Use them anywhere you need a tight seal, such as protecting electronics from moisture or keeping lubricants contained in machinery.
    Rubber
    Image of Product. Front orientation. Sealing Washers. Rubber.
    Resist leaks better than metal sealing washers, but are more susceptible to wear and tear. Reuse these washers a handful of times, as long as the material isn't damaged.
    Weather-Resistant EPDM—The best choice for outdoor use, these washers withstand long-term exposure to sunlight, rain, and ozone. However, they can't handle oil, grease, or fuel like Buna-N washers can.
    Temp.
    Range, ° F
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Min.
    Max.
    Color
    Food Industry Std.
    Pkg.
    Qty.
    Pkg.
    Weather-Resistant EPDM
    M26
    		27.00050.0001.190 to 1.950-50300WhiteFDA Compliant 21 CFR 177.2600
    		599186A144000000
     
    Metal
    Image of Product. Front orientation. Sealing Washers. Metal.
    Also known as crush washers, these are made of soft metal that deforms under pressure to fill gaps around the nut or screw. Often found in oil drain valves, they withstand stress and wear better than plastic and rubber washers, but aren't as leak-resistant. Metal sealing washers are not reusable.
    Copper—Softer than aluminum washers, these deform easily to create a tight seal with less effort. They resist rusting in corrosive environments, but will develop a green patina over time.
    Cellulose-Filled Copper—The easiest washers to crush. These washers are embedded with cellulose, which makes them more flexible than other metal washers for a tighter seal. They resist rusting in corrosive environments, but will develop a green patina over time.
    Aluminum—These washers are an economical alternative to copper. They have similar corrosion resistance but require more effort to crush.
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Copper
    M26
    		26.30032.2001.8 to 2.2DIN 7603597725A125000000
     
    Cellulose-Filled Copper
    M26
    		26.30030.9002.3 to 2.7DIN 76031097725A31700000
    M26
    		26.30031.9002.3 to 2.7DIN 76031097725A31800000
    M26
    		26.30033.9002.3 to 2.7DIN 76031097725A31900000
     
    Aluminum
    M26
    		26.30031.9001.8 to 2.2DIN 76031097725A11300000
     

    Oversized Washers

    Cover oversized holes or use these washers as spacers and levelers. Compared to general purpose washers, these have a larger diameter or thickness.
    Steel
    Image of Product. Front orientation. Contains Annotated. Washers. Oversized Washers.
    Image of Specification. Front orientation. Washers. Oversized Washers.
    Steel—Best for dry environments since moisture will cause these washers to rust.
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Pkg.
    Qty.
    Pkg.
    Steel
    M26
    		26.040.04.4 to 5.6596505A12700000
     

    General Purpose Washers

    Image of Product. Front orientation. Washers. General Purpose Washers.
    Image of Specification. Front orientation. Washers. General Purpose Washers.

    Your go-to metal washer for every screw size. Washers take the pressure off nuts and screws to protect mounting surfaces.
    Stainless SteelAbout Stainless Steel
    18-8 Stainless Steel—The choice for wet and outdoor environments, these washers resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.
    United States
    Origin—Small Pack
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    M26
    		27.050.03.7 to 4.3198689A21300000
     
    Steel
    Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
    United States
    Origin—Small Pack
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    M26
    		27.050.03.7 to 4.3198688A14100000
     
    back to top