McMaster-Carr logo
    Filter by
    System of Measurement
    Thickness
    Shape
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Compare
    DFARS Specialty Metals
    Industrial Info Compare
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Magnetic Properties
    Shaft Type
    Sold As
    Minimum Hardness
    Specifications Met
    Edge Type
    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)
    59 Products

    Shims

    Image of Product. Front orientation. Shims. Round, Sold Individually.
    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
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A44900000
     
    11/32" ID × 13/16" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A7990000
     
    3/8" ID × 5/8" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A4510000
     
    1/2" ID × 3/4" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A4520000
     
    5/8" ID × 1" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A45300000
     
    3/4" ID × 1 1/8" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A45400000
     
    7/8" ID × 1 3/8" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A45500000
     
    1" ID × 1 1/2" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A45600000
     
    1 1/8" ID × 1 5/8" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A45700000
     
    1 1/4" ID × 1 3/4" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A45800000
     
    1 3/8" ID × 1 7/8" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A45900000
     
    1 1/2" ID × 2 1/8" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B65103088A46100000
     
    1 3/4" ID × 2 3/4" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B6553088A46200000
     
    2" ID × 2 3/4" OD
    0.047"-0.002" to 0.002"0" to 0.011"-0.002" to 0.002"Rockwell B6553088A46300000
     

    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.
    Nylon—Our most versatile insulating washers, these block unwanted current in everything from switches and circuit breakers to control panels and electric motors.
    Sleeve
    Temp.
    Range, ° F
    For Screw
    Size
    Ht.
    OD
    ID
    OD
    Thk.
    Overall
    Ht.
    Min.
    Max.
    Color
    Pkg.
    Qty.
    Pkg.
    Nylon
    No. 2
    		0.125"0.120"0.090"0.181"0.047"0.172"-40180Off-White10091145A110000000
    No. 2
    		0.250"0.120"0.090"0.181"0.047"0.297"-40180Off-White10091145A11400000
    No. 2
    		0.375"0.120"0.090"0.181"0.047"0.422"-40180Off-White10091145A11800000
    No. 4
    		0.047"0.145"0.115"0.235"0.047"0.094"-40180Off-White10091145A21200000
    No. 4
    		0.052"0.136"0.120"0.253"0.047"0.099"-40180Off-White10091145A22700000
    No. 4
    		0.063"0.145"0.115"0.235"0.047"0.110"-40180Off-White10091145A21100000
    No. 4
    		0.125"0.145"0.115"0.235"0.047"0.172"-40180Off-White10091145A12900000
    No. 4
    		0.250"0.145"0.115"0.235"0.047"0.297"-40180Off-White10091145A13300000
    No. 4
    		0.375"0.145"0.115"0.235"0.047"0.422"-40180Off-White10091145A13400000
    No. 4
    		0.500"0.145"0.115"0.235"0.047"0.547"-40180Off-White10091145A13800000
    No. 6
    		0.047"0.170"0.140"0.290"0.047"0.094"-40180Off-White10091145A21500000
    No. 6
    		0.063"0.170"0.140"0.290"0.047"0.110"-40180Off-White10091145A21400000
    No. 6
    		0.125"0.170"0.140"0.290"0.047"0.172"-40180Off-White10091145A14100000
    No. 6
    		0.188"0.170"0.140"0.290"0.047"0.235"-40180Off-White10091145A21300000
    No. 6
    		0.250"0.170"0.140"0.290"0.047"0.297"-40180Off-White10091145A14300000
    No. 6
    		0.375"0.170"0.140"0.290"0.047"0.422"-40180Off-White10091145A14400000
    No. 6
    		0.500"0.170"0.140"0.290"0.047"0.547"-40180Off-White10091145A14500000
    9/16"
    		0.203"0.750"0.617"0.880"0.047"0.250"-40180Off-White5091145A30100000
     

    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.
    Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these washers have a dark, matte coating to create a finished look. They won't rust in wet and outdoor environments, but can't hold up to harsh chemicals as well as 316 stainless steel.
    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.
    Steel—Best for dry environments since moisture will cause these washers to rust.
    Highly Corrosion-Resistant Zinc-Flake-Coated Steel—With 40 times the corrosion resistance of zinc-plated 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.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    No. 8
    		0.174"0.307"0.047"ASME B18.21.110091007A62300000————0
    No. 10
    		0.200"0.334"0.047"ASME B18.21.110092146A55000001,00092146A011000000
     
    Black-Oxide 18-8 Stainless Steel
    No. 10
    		0.200"0.334"0.047"ASME B18.21.110092146A6190000————0
     
    Highly Corrosion-Resistant 316 Stainless Steel
    No. 10
    		0.200"0.334"0.047"ASME B18.21.110092147A43000001,00092147A01100000
     
    Zinc-Plated Steel
    No. 10
    		0.200"0.334"0.047"ASME B18.21.110091102A74000001,00091102A01100000
     
    Steel
    No. 10
    		0.200"0.334"0.047"ASME B18.21.1————01,00091101A01100000
     
    Highly Corrosion-Resistant Zinc-Flake-Coated Steel
    No. 10
    		0.200"0.334"0.047"ASME B18.21.1255185N1510000————0
     
    Aluminum
    No. 10
    		0.200"0.334"0.047"ASME B18.21.110091013A7180000————0
     
    Highly Corrosion-Resistant Silicon Bronze
    No. 10
    		0.200"0.334"0.047"ASME B18.21.110093496A4150000————0
     

    Split Lock Washers for Socket Head Screws

    Image of Product. Front orientation. Lock Washers. Split-Lock Washer, For Socket Head Screws.
    Stop socket head screws from loosening due to mild vibration. These washers have a small diameter to fit under screws with narrow heads, but are still thick enough to keep fasteners secure. 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. Also known as high-collar lock washers.
    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.
    Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these washers have a dark, matte coating to create a finished look. They won't rust in wet and outdoor environments, but can't hold up to harsh chemicals as well as 316 stainless steel.
    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.
    Black-Oxide Steel—Best for dry environments since moisture will cause these washers to rust. They have a dark, matte appearance.
    Steel—Best for dry environments since moisture will cause these washers to rust.
    For Screw
    Size
    ID
    OD
    Thk.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    No. 8
    		0.174"0.267"0.047"ASME B18.21.110098437A10600000
    No. 10
    		0.200"0.294"0.047"ASME B18.21.110098437A1080000
     
    Black-Oxide 18-8 Stainless Steel
    No. 8
    		0.174"0.267"0.047"ASME B18.21.110093711A30000000
    No. 10
    		0.200"0.294"0.047"ASME B18.21.15093711A4000000
     
    Highly Corrosion-Resistant 316 Stainless Steel
    No. 8
    		0.174"0.267"0.047"ASME B18.21.110094241A2500000
    No. 10
    		0.200"0.294"0.047"ASME B18.21.110094241A2600000
     
    Zinc-Plated Steel
    No. 10
    		0.200"0.294"0.047"ASME B18.21.15092961A1130000
     
    Black-Oxide Steel
    No. 10
    		0.200"0.294"0.047"ASME B18.21.15092962A1120000
     
    Steel
    No. 10
    		0.200"0.294"0.047"ASME B18.21.110090073A0110000
     

    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.
    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.
    Corrosion-Resistant Cadmium-Plated Steel—The finish creates a better barrier against rust than zinc plating for use in wet and outdoor environments.
    For Screw
    Size
    ID
    OD
    Thk.
    Mil. Spec.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Highly Corrosion-Resistant Passivated 316 Stainless Steel
    No. 10
    		0.193"0.334"0.047"MS35338-138ASME B18.21.110091475A02700000
     
    Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel
    No. 10
    		0.193"0.334"0.047"MS35338-138ASME B18.21.110091475A3910000
     
    Zinc-Yellow-Chromate-Plated Steel
    No. 10
    		0.193"0.334"0.047"MS35338-43ASME B18.21.110091475A2740000
     
    Corrosion-Resistant Cadmium-Plated Steel
    No. 10
    		0.193"0.334"0.047"MS35338-43ASME B18.21.15091475A5310000
     

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

    Image of Product. Front orientation. Lock Washers. Spring Lock Washer, For Socket Head Screws, Conical 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.
    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.
    Zinc-Plated Steel
    5/8", M16
    		0.669"0.945"0.047"0.083"Top and Bottom2590895A214000000
     
    Steel
    9/16", M14
    		0.591"0.866"0.047"0.079"Top and Bottom5093501A03400000
     
    back to top