McMaster-Carr logo
    Filter by
    System of Measurement
    Thickness
    Screw Size
    Industrial Info Compare
    Shape
    Washer Type
    DFARS Specialty Metals
    Industrial Info Compare
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Shaft Type
    Magnetic Properties
    Minimum Hardness
    Sold As
    Fastener Strength Grade/Class
    Industrial Info Snippet
    Specifications Met
    Maximum Temperature
    Overall Height
    Attribute Image
    Fastener Strength Rating
    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)
    28 Products

    Shims

    Image of Product. Front orientation. Shims. Sold Individually, Round.
    With thickness tolerances as fine as a strand of hair, these shims precisely align, space, and level components on shafts, arbors, and machinery.
    You can stack multiple shims to achieve your exact thickness, but stacking more than four may cause them to shift. Remember, fewer shims are better, so a couple of thicker shims are more stable than a bunch of thin shims.
    Carbon Steel—Best for dry environments since moisture will cause these shims to rust.
    Thk.
    Thk. Tolerance
    ID
    Tolerance
    OD Tolerance
    Min.
    Hardness
    Pkg.
    Qty.
    Pkg.
    Carbon Steel
     
    1/4" ID × 3/8" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A877000000
     
    11/32" ID × 13/16" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A8800000
     
    3/8" ID × 5/8" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A88400000
     
    1/2" ID × 3/4" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A8870000
     
    5/8" ID × 1" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A98100000
     
    3/4" ID × 1 1/8" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A89400000
     
    1" ID × 1 1/2" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A89700000
     
    1 1/8" ID × 1 5/8" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A900000
     
    1 1/4" ID × 1 3/4" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A90300000
     
    1 3/8" ID × 1 7/8" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A90800000
     
    1 1/2" ID × 2 1/8" OD
    0.188"-0.007" to 0.007"0" to 0.011"-0.01" to 0.01"Rockwell B6513088A91100000
     

    Split Lock Washers

    Image of Product. Front orientation. Lock Washers. Split-Lock Washer.
    Stop nuts and screws from loosening due to mild vibration. As you tighten, the uneven ends bite into the nut or screw so it won't back out. While they're not as vibration resistant as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads.
    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.
    Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.
    Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
    Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.
    Black-Oxide Steel—Typically chosen for their appearance, these washers have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.
    Steel—Best for dry environments since moisture will cause these washers to rust.
    Corrosion-Resistant Galvanized Steel—These washers combine the strength of steel with the rust resistance of stainless steel. They're an alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals.
    Highly Corrosion-Resistant Zinc-Flake-Coated Steel—With 40 times the corrosion resistance of zinc-plated steel, these withstand rust as well as 316 stainless steel. They have been tested to extreme standards, including 1,000 hours of salt spray. They are similar to Magni-coated washers.
    Aluminum—One-third the weight of steel, these washers are commonly used for assemblies that have weight limits. They're an alternative to stainless steel for rust resistance, but aren't as strong.
    Highly Corrosion-Resistant Silicon Bronze—The choice for marine environments, these washers won't rust or deteriorate when submerged in salt water. They resist corrosion as well as 316 stainless steel, but are not quite as strong.
    Small Pack
    Large Pack
    For Screw
    Size
    ID
    OD
    Thk.
    For Fastener Strength
    Grade/Class
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    3/4"
    		0.766"1.265"0.188"—ASME B18.21.11092146A03600000————0
     
    Highly Corrosion-Resistant 316 Stainless Steel
    3/4"
    		0.766"1.265"0.188"—ASME B18.21.11092147A03600000————0
     
    Zinc-Plated Steel
    3/4"
    		0.766"1.265"0.188"—ASME B18.21.15091102A03600000————0
     
    Zinc-Yellow-Chromate-Plated Steel
    3/4"
    		0.766"1.265"0.188"SAE Grade 8
    		ASME B18.21.12591104A04700000————0
     
    Black-Oxide Steel
    3/4"
    		0.766"1.265"0.188"—ASME B18.21.155185N1180000————0
     
    Steel
    3/4"
    		0.766"1.265"0.188"—ASME B18.21.15091101A2360000050091101A0360000000
     
    Corrosion-Resistant Galvanized Steel
    3/4"
    		0.766"1.265"0.188"—ASME B18.21.12595160A25000000————0
     
    Highly Corrosion-Resistant Zinc-Flake-Coated Steel
    3/4"
    		0.766"1.265"0.188"—ASME B18.21.115185N1360000————0
     
    Aluminum
    3/4"
    		0.766"1.265"0.188"—ASME B18.21.11091013A73600000————0
     
    Highly Corrosion-Resistant Silicon Bronze
    3/4"
    		0.766"1.265"0.188"—ASME B18.21.1593496A43600000————0
     

    Insulating Sleeve Washers

    Cover screw threads to stop electrical current in its tracks and prevent short circuits. These washers create a barrier between the screw threads and the mating surface when mounted in through holes. This barrier also extends the life of your assembly by preventing galvanic corrosion, which is when two different metals rust more quickly due to contact with each other.
    Flat Edge
    Image of Product. Front orientation. Insulating Washers. Insulating Sleeve Washers, Flat Edge.
    The flat edge distributes weight evenly to take pressure off screw heads.
    Extra-High-Temperature Ceramic—Our most heat-resistant washers and the best electrical insulators. These won't melt or become brittle at blistering temperatures up to 1,700° F, making them perfect for ovens, kilns, and furnaces. Ceramic may crack or dent if subjected to hard bumps, however, so these washers are not recommended for high-vibration applications.
    Sleeve
    Temp.
    Range
    For Screw
    Size
    Ht.
    OD
    ID
    OD
    Thk.
    Overall
    Ht.
    Min.
    Max.,
    ° F
    Color
    Pkg.
    Qty.
    Pkg.
    Extra-High-Temperature Ceramic
    1/4"
    		0.062"0.593"0.265"0.875"0.188"0.250"Not Rated1,700Off-White592107A421000000
     

    Coil Lock Washers

    Image of Product. Front orientation. Lock Washers. Coil Washer.
    Washers flatten under pressure and push against the nut or screw to stop it from backing out. The double coil adds more tension than split lock washers for a tighter hold on materials that contract and expand, such as plastic and wood. These washers are reusable a handful of times, but their holding power decreases with each use.
    Corrosion-Resistant Galvanized Steel—These washers combine the strength of steel with the rust resistance of stainless steel. They're an alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals.
    For Screw
    Size
    ID
    OD
    Thk.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Corrosion-Resistant Galvanized Steel
    3/4"
    		0.759"1.265"0.188"ASME B18.21.1192353A14000000
     

    Mil. Spec. Split Lock Washers

    Image of Product. Front orientation. Lock Washers. Mil. Spec., Split-Lock Washer.
    These washers are manufactured and tested to strict U.S. military standards for material and construction. As you tighten, the uneven ends bite into the nut or screw so it won't loosen due to mild vibration. While they don't hold as tightly as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads.
    Passivated 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.
    Highly Corrosion-Resistant Passivated 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.
    Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. Even if the coating wears off, these washers will hold up in just about any environment, including salt water and most chemicals.
    Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.
    For Screw
    Size
    ID
    OD
    Thk.
    Mil. Spec.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Passivated 18-8 Stainless Steel
    3/4"
    		0.753"1.265"0.188"MS35338-146ASME B18.21.1591475A040000000
     
    Highly Corrosion-Resistant Passivated 316 Stainless Steel
    3/4"
    		0.753"1.265"0.188"MS35338-146ASME B18.21.1291475A7500000
     
    Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel
    3/4"
    		0.753"1.265"0.188"MS35338-146ASME B18.21.1291475A7800000
     
    Zinc-Yellow-Chromate-Plated Steel
    3/4"
    		0.753"1.265"0.188"MS35338-51ASME B18.21.1591475A7900000
     
    back to top