McMaster-Carr logo
    Filter by
    System of Measurement
    Washer Type
    For Bearing Nut Face Style
    Tab Width
    Attribute Image
    DFARS Specialty Metals
    Industrial Info Compare
    Specifications Met
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Compare
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Washer Designation
    Tooth Location
    For Bearing Nut Specifications Met
    For Use With
    Serration Location
    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)
    8 Products

    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.
    Small Pack—United
    States Origin
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    M25
    		26.047.02.7 to 3.3598689A212000000
     

    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
    M25
    		25.040.03.7 to 4.3596505A12600000
     

    Bearing Spring Lock Washers for Slotted Bearing Nuts

    Image of System. Front orientation. Contains Annotated. For Chamfered Nuts. Bearing Spring Lock Washers for Slotted Bearing Nuts.
    Image of System. Front orientation. Contains Annotated. For Stepped Nuts. Bearing Spring Lock Washers for Slotted Bearing Nuts.
    Image of Attribute. Front orientation. Contains MultipleImages. For Chamfered Nuts.

    For Chamfered Nuts

    Image of Attribute. Front orientation. Contains MultipleImages. For Stepped Nuts.

    For Stepped Nuts

    Designed for use with bearing nuts, these lock washers have a conical shape that presses like a spring against bearings, bushings, gears, and pulleys to hold them in place on your threaded shaft or spindle. They also have an inner tab that sits in the shaft or spindle’s keyway to prevent the nut from loosening.
    Steel—Steel washers are strong and flexible.
    External Tooth—Washers with external teeth grip components using their teeth, in addition to spring tension.
    DIN 5406—DIN 462 and DIN 5406 washers meet international standards for lock washer dimensions. Pair DIN 462 washers with DIN 1804 bearing nuts, and DIN 5406 washers with DIN 981 bearing nuts.
    Tab,
    mm
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk.,
    mm
    Wd.
    Dp.
    Overall
    Ht., mm
    Tooth
    Location
    Hardness
    Specs.
    Met
    For Bearing
    Nut Specs. Met
    Each
    For Chamfered Nuts
     
    Steel
    M25
    		25.00042.0001.2505.0002.0003.500ExternalNot RatedDIN 5406DIN 98190391A11600000
     
    For Stepped Nuts
     
    Steel
    M25
    		25.00042.0001.0006.0002.5004.000—Not Rated——90407A1220000
     

    Heavy-Vibration-Resistant Spring Lock Washers for Socket Head Screws

    Image of Product. Front orientation. Lock Washers. Conical Washer, For Socket Head Screws, Spring Lock Washer.
    Stop socket head screws from wiggling loose on equipment with constant, vigorous vibration, such as engines, turbines, and generators. These washers have a small diameter to fit under screws with narrow heads. Similar to a spring, they flatten under pressure to add tension between mating surfaces. As long as the washers aren't deformed or otherwise damaged, you can reuse them indefinitely without losing locking strength. Also known as conical washers and Belleville washers.
    Stack multiple washers in the same direction to double or triple how much weight they can bear. Stack washers in opposite directions for better deflection, which means they compress further and withstand more shock and movement without loosening.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these washers won't rust when exposed to moisture. However, they can't hold up to the harsh chemicals that 316 stainless steel can.
    Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
    Steel—Best for dry environments since moisture will cause these washers to rust.
    Top-and-Bottom Serration—Adds friction for extra gripping power.
    For Screw
    Size
    ID
    OD
    Thk.
    Overall
    Ht.
    Serration
    Location
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    1", M25
    		1.063"1.496"0.098"0.142"Top and Bottom190895A114000000
     
    Zinc-Plated Steel
    1", M25
    		1.063"1.496"0.071"0.122"Top and Bottom590895A21900000
     
    Steel
    1", M25
    		1.063"1.496"0.079"0.122"Top and Bottom1093501A03800000
     

    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.
    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.
    For Screw
    Size
    ID,
    mm
    OD,
    mm
    Thk., mm
    Pkg.
    Qty.
    Pkg.
    Copper
    M25
    		28.00036.5002.8 to 3.2197725A244000000
     
    back to top