McMaster-Carr logo
    Filter by
    System of Measurement
    Thickness
    For Maximum Screw Size
    Industrial Info Compare
    Washer Type
    Number of Slots
    End Shape
    Export Control Classification Number (ECCN)
    DFARS Specialty Metals
    Industrial Info Compare
    Sold As
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    84 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.
    Aluminum—These shims are an alternative to stainless steel for rust resistance but aren't as hard so they may not retain their shape as well. One-third the weight of steel, they’re commonly used in robotics and automation.
    Brass—With a warm, polished look, these shims are often chosen for their appearance. Similar to 18-8 stainless steel, brass is corrosion resistant enough to stand up to wet environments.
    Thk.
    Thk. Tolerance
    ID
    Tolerance
    OD Tolerance
    Min.
    Hardness
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Aluminum
     
    1/4" ID × 3/8" OD
    0.063"-0.0035" to 0.0035"0" to 0.011"-0.002" to 0.002"Not Rated1000000000000000
     
    3/8" ID × 5/8" OD
    0.063"-0.0035" to 0.0035"0" to 0.011"-0.002" to 0.002"Not Rated100000000000000
     
    1/2" ID × 3/4" OD
    0.063"-0.0035" to 0.0035"0" to 0.011"-0.002" to 0.002"Not Rated1000000000000000
     
    5/8" ID × 1" OD
    0.063"-0.0035" to 0.0035"0" to 0.011"-0.002" to 0.002"Not Rated1000000000000000
     
    3/4" ID × 1 1/8" OD
    0.063"-0.0035" to 0.0035"0" to 0.011"-0.002" to 0.002"Not Rated1000000000000000
     
    1" ID × 1 1/2" OD
    0.063"-0.0035" to 0.0035"0" to 0.011"-0.002" to 0.002"Not Rated1000000000000000
     
    Brass
     
    3/8" ID × 5/8" OD
    0.063"-0.005" to 0.005"0" to 0.011"-0.002" to 0.002"Rockwell B60ASTM B36100000000000000
     
    1/2" ID × 3/4" OD
    0.063"-0.005" to 0.005"0" to 0.011"-0.002" to 0.002"Rockwell B60ASTM B361000000000000000
     
    5/8" ID × 1" OD
    0.063"-0.005" to 0.005"0" to 0.011"-0.002" to 0.002"Rockwell B60ASTM B361000000000000000
     
    3/4" ID × 1 1/8" OD
    0.063"-0.005" to 0.005"0" to 0.011"-0.002" to 0.002"Rockwell B60ASTM B361000000000000000
     
    1" ID × 1 1/2" OD
    0.063"-0.005" to 0.005"0" to 0.011"-0.002" to 0.002"Rockwell B60ASTM B36500000000000000
     

    Large-Adjust Slotted Shims

    Image of Product. Front orientation. Shims. Sold Individually, Slot, Round End.

    Round End

    Best for filling large gaps, these thick shims are commonly used to align cabinets, doors, and windows. Slip them around existing mounting fasteners without unfastening them. All are made of plastic to resist moisture and prevent rot. To reduce sizing errors, these shims are color coded by thickness to quickly spot and grab the right size every time.
    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.
    Slot
    Thk.
    Thk. Tolerance
    For Max.
    Screw Size
    Wd.
    Dp.
    Material
    Color
    End
    Shape
    Pkg.
    Qty.
    Pkg.
    1" Lg. × 2" Wd.
    0.063"-0.032" to 0.032"1/2"
    9/16"13/16"PolystyreneBlueRound50000000000000
     
    2" Lg. × 1 1/2" Wd.
    0.063"-0.032" to 0.032"7/16"
    1/2"1 1/2"Polypropylene
    BlueRound10000000000000
     
    2 3/4" Lg. × 2" Wd.
    0.063"-0.032" to 0.032"9/16"
    5/8"2 1/16"Polypropylene
    BlueRound100000000000000
     
    3" Lg. × 2 1/4" Wd.
    0.063"-0.032" to 0.032"3/4"
    13/16"2 1/4"Polypropylene
    BlueRound100000000000000
     
    3 1/2" Lg. × 1 1/2" Wd.
    0.063"-0.032" to 0.032"7/16"
    1/2"3"Polypropylene
    BlueRound100000000000000
     
    4" Lg. × 3" Wd.
    0.063"-0.032" to 0.032"3/4"
    13/16"3"PolystyreneBlueRound1000000000000
     

    Heavy Duty Large-Adjust Slotted Shims

    Image of Product. Front orientation. Shims. Slot, Sold Individually, Heavy Duty.
    These thick shims keep their shape under heavy loads. Best for filling large gaps, they're often used to align hefty machinery, metal supply cabinets, and safes. Slip them around existing mounting fasteners without unfastening them. Stronger than plastic, all are made of stainless steel and won't degrade when exposed to harsh weather, salt water, and most chemicals.
    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.
    Slot
    Thk.
    Thk. Tolerance
    For Max.
    Screw Size
    Wd.
    Dp.
    Material
    End
    Shape
    Each
    2" Lg. × 1 1/2" Wd.
    0.063"-0.032" to 0.032"1/2"
    1/2"1 1/2"316 Stainless Steel
    Round000000000000
     
    2 3/4" Lg. × 2" Wd.
    0.063"-0.032" to 0.032"5/8"
    5/8"2"316 Stainless Steel
    Round00000000000
     
    3" Lg. × 2 1/4" Wd.
    0.063"-0.032" to 0.032"3/4"
    13/16"2 1/4"316 Stainless Steel
    Round000000000000
     
    3 1/2" Lg. × 1 1/2" Wd.
    0.063"-0.032" to 0.032"1/2"
    1/2"3"316 Stainless Steel
    Round000000000000
     

    Secure-Stack Slotted Shims

    Image of Product. Front orientation. Shims. Secure Stack, Slot, Sold Individually.
    Snap these shims together and they’ll stay securely stacked to maintain alignment. Best for filling large gaps, they're commonly used to align cabinets, doors, and windows. Slip them around existing mounting fasteners without unfastening them. To reduce sizing errors, these shims are color coded by thickness to quickly spot and grab the right size every time. All are made of plastic to resist moisture and prevent rot.
    Slot
    Thk.
    Thk. Tolerance
    For Max.
    Screw Size
    Wd.
    Dp.
    Material
    Color
    End
    Shape
    Pkg.
    Qty.
    Pkg.
    3" Lg. × 1 1/2" Wd.
    0.063"-0.032" to 0.032"1/2"
    1/2"2 1/2"PolystyreneBlueRound2500000000000000
     
    4" Lg. × 3" Wd.
    0.063"-0.032" to 0.032"3/4"
    7/8"3"PolystyreneBlueRound250000000000000
     

    Breakaway Slotted Shims

    Image of Product. Front orientation. Shims. Slot, Sold Individually, Breakaway.
    Eliminate swapping out shims of varying lengths—break off the scored sections for the length you need. Best for filling large gaps, these shims are commonly used to align cabinets, doors, and windows. Slip them around existing mounting fasteners without unfastening them. All are made of plastic to resist moisture and prevent rot.
    Slot
    Thk.
    Thk. Tolerance
    For Max.
    Screw Size
    Wd.
    Dp.
    Material
    Color
    End
    Shape
    Pkg.
    Qty.
    Pkg.
    2" to 3 1/2" Lg. × 2" Wd.
    0.063"-0.032" to 0.032"9/16"
    5/8"2 7/8"PolystyreneBlackTab16000000000000
     
    2" to 4 1/4" Lg. × 2" Wd.
    0.063"-0.032" to 0.032"9/16"
    5/8"3 9/16"PolystyreneBlackTab1600000000000
     
    2" to 4 3/4" Lg. × 2" Wd.
    0.063"-0.032" to 0.032"9/16"
    5/8"4 1/8"PolystyreneBlackTab1600000000000
     

    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.
    Ultra-Chemical-Resistant PTFE—These washers insulate better than nylon and withstand higher temperatures, so they're a great choice for high-voltage equipment, such as capacitators, transformers, and semiconductors. They resist harsh acids, bases, solvents, and corrosive cleaners.
    Sleeve
    Temp.
    Range, ° F
    For Screw
    Size
    Ht.
    OD
    ID
    OD
    Thk.
    Overall
    Ht.
    Min.
    Max.
    Color
    Pkg.
    Qty.
    Pkg.
    Nylon
    No. 8
    0.125"0.205"0.173"0.344"0.063"0.188"-40180Off-White100000000000000000
    No. 8
    0.141"0.205"0.173"0.344"0.063"0.204"-40180Off-White10000000000000000
    No. 8
    0.250"0.205"0.173"0.344"0.063"0.313"-40180Off-White10000000000000000
    No. 8
    0.375"0.205"0.173"0.344"0.063"0.438"-40180Off-White10000000000000000
    No. 8
    0.500"0.205"0.173"0.344"0.063"0.563"-40180Off-White10000000000000000
    No. 8
    0.625"0.205"0.173"0.344"0.063"0.688"-40180Off-White10000000000000000
    No. 8
    0.750"0.205"0.173"0.344"0.063"0.813"-40180Off-White10000000000000000
    No. 10
    0.062"0.308"0.196"0.500"0.063"0.125"-40180Off-White5000000000000000
    No. 10
    0.125"0.312"0.199"0.433"0.063"0.188"-40180Off-White10000000000000000
    No. 10
    0.141"0.260"0.200"0.399"0.063"0.204"-40180Off-White10000000000000000
    No. 10
    0.188"0.260"0.200"0.399"0.063"0.251"-40180Off-White10000000000000000
    No. 10
    0.250"0.260"0.200"0.399"0.063"0.313"-40180Off-White10000000000000000
    No. 10
    0.375"0.260"0.200"0.399"0.063"0.438"-40180Off-White10000000000000000
    No. 10
    0.500"0.260"0.200"0.399"0.063"0.563"-40180Off-White10000000000000000
    No. 10
    0.625"0.260"0.200"0.399"0.063"0.688"-40180Off-White10000000000000000
    No. 10
    0.750"0.260"0.200"0.399"0.063"0.813"-40180Off-White10000000000000000
    1/4"
    0.094"0.312"0.260"0.505"0.063"0.157"-40180Off-White10000000000000000
    1/4"
    0.125"0.312"0.260"0.513"0.063"0.188"-40180Off-White10000000000000000
    1/4"
    0.125"0.327"0.260"0.630"0.063"0.188"-40180Off-White5000000000000000
    1/4"
    0.188"0.312"0.260"0.513"0.063"0.251"-40180Off-White10000000000000000
    1/4"
    0.250"0.312"0.260"0.513"0.063"0.313"-40180Off-White10000000000000000
    1/4"
    0.375"0.312"0.260"0.513"0.063"0.438"-40180Off-White10000000000000000
    1/4"
    0.375"0.312"0.261"0.513"0.063"0.438"-40180Off-White10000000000000000
    1/4"
    0.500"0.312"0.260"0.513"0.063"0.563"-40180Off-White10000000000000000
    1/4"
    0.625"0.312"0.260"0.513"0.063"0.688"-40180Off-White10000000000000000
    1/4"
    0.750"0.312"0.260"0.513"0.063"0.813"-40180Off-White10000000000000000
    5/16"
    0.125"0.360"0.320"0.620"0.063"0.188"-40180Off-White10000000000000000
    5/16"
    0.250"0.360"0.320"0.625"0.063"0.313"-40180Off-White10000000000000000
    5/16"
    0.375"0.360"0.320"0.620"0.063"0.438"-40180Off-White10000000000000000
    5/16"
    0.500"0.360"0.320"0.620"0.063"0.563"-40180Off-White10000000000000000
    5/16"
    0.625"0.360"0.320"0.620"0.063"0.688"-40180Off-White10000000000000000
    3/8"
    0.188"0.437"0.376"0.743"0.063"0.251"-40180Off-White10000000000000000
    3/8"
    0.188"0.498"0.378"0.750"0.063"0.251"-40180Off-White10000000000000000
    3/8"
    0.313"0.500"0.395"0.625"0.063"0.376"-40180Off-White10000000000000000
    3/8"
    0.375"0.470"0.385"0.570"0.063"0.438"-40180Off-White10000000000000000
    3/8"
    0.440"0.495"0.390"0.745"0.063"0.503"-40180Off-White5000000000000000
    3/8"
    0.563"0.500"0.382"1.000"0.063"0.626"-40180Off-White5000000000000000
    3/8"
    1.000"0.500"0.375"0.875"0.063"1.063"-40180Off-White5000000000000000
    1/2"
    0.094"0.740"0.515"1.125"0.063"0.157"-40180Off-White5000000000000000
    1/2"
    0.406"0.600"0.538"1.252"0.063"0.469"-40180Off-White2500000000000000
    5/8"
    0.500"0.750"0.635"0.875"0.063"0.563"-40180Off-White5000000000000000
     
    Ultra-Chemical-Resistant PTFE
    No. 2
    0.062"0.125"0.091"0.312"0.063"0.125"Not Rated500White50000000000000
     

    Peel-Away Multilayer Shim Stock

    Image of ProductInUse. Front orientation. Shim Stock. Peel Away, Sold Individually, Multilayer.
    Fine-tune thickness without worrying about stacking multiple shims. Cut the shim stock into custom shapes that suit your needs. It's made of metal layers bonded with adhesive—peel off the layers with a utility knife until you reach your desired thickness. To make peeling easier, warm the created shims to soften the adhesive. With thickness tolerances as fine as a strand of hair, the shims will precisely align, space, and level components on dies, presses, and machinery.
    18-8 Stainless Steel—The choice for wet and outdoor areas because it resists rust. However, it will corrode or pit when exposed to salt water and chemicals.
    Carbon Steel—Best for dry areas since moisture will cause it to rust.
    Aluminum—An alternative to stainless steel for rust resistance but less hard so it may not retain its shape. One-third the weight of steel, it's often used in robotics and automation.
    Temper Rating—Choose half hard to create shims that you’ll need to bend or shape. Opt for full hard to make stronger shims that will maintain their shape under loads.
    Thk.
    Thk. Tolerance
    No. of
    Layers
    Layer
    Thk.
    Temper
    Rating
    Specs. Met
    Form
    Each
    18-8 Stainless Steel
     
    12" Wide × 12" Long
    0.063"-0.002" to 0.006"190.003"SAE AMS-DTL-22499Sheet00000000000000
     
    20" Wide × 24" Long
    0.063"-0.002" to 0.006"190.003"SAE AMS-DTL-22499Sheet0000000000000
     
    Carbon Steel
     
    12" Wide × 12" Long
    0.063"-0.002" to 0.006"190.003"Fed. Spec. QQ-S-698, SAE AMS-DTL-22499Sheet000000000000
     
    20" Wide × 24" Long
    0.063"-0.002" to 0.006"190.003"Fed. Spec. QQ-S-698, SAE AMS-DTL-22499Sheet0000000000000
     
    Aluminum
     
    12" Wide × 12" Long
    0.063"-0.002" to 0.006"210.003"Full HardSAE AMS-DTL-22499Sheet000000000000
     

    Spring Lock Washers for Slotted Bearing Nuts

    Image of System. Front orientation. Contains Annotated. For Chamfered Nuts. Spring Lock Washer.
    Image of Attribute. Front orientation. Contains MultipleImages. For Chamfered Nuts.

    For Chamfered 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.
    Stainless Steel—Stainless steel washers are more corrosion and chemical resistant than steel washers.
    External Tooth—Washers with external teeth grip components using their teeth, in addition to spring tension.
    Tab
    For Screw
    Size
    ID
    OD
    Thk.
    Wd.
    Dp.
    Overall
    Ht.
    Tooth
    Location
    Hardness
    Specs. Met
    For Bearing Nut
    Specs. Met
    Each
    For Chamfered Nuts
     
    Steel
    1 1/2"
    1.583"2.469"0.063"0.290"0.095"0.232"ExternalNot RatedANSI/ABMA 8.2ANSI/ABMA 8.200000000000000
    1 3/4"
    1.792"2.734"0.063"0.290"0.096"0.224"ExternalNot RatedANSI/ABMA 8.2ANSI/ABMA 8.20000000000000
    1 7/8"
    1.992"2.922"0.063"0.290"0.097"0.239"ExternalNot RatedANSI/ABMA 8.2ANSI/ABMA 8.20000000000000
     
    Stainless Steel
    1 1/2"
    1.583"2.469"0.063"0.290"0.095"0.232"ExternalNot RatedANSI/ABMA 8.2ANSI/ABMA 8.200000000000000
    1 3/4"
    1.792"2.734"0.063"0.290"0.096"0.224"ExternalNot RatedANSI/ABMA 8.2ANSI/ABMA 8.200000000000000
    1 7/8"
    1.992"2.922"0.063"0.290"0.097"0.239"ExternalNot RatedANSI/ABMA 8.2ANSI/ABMA 8.200000000000000
     

    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.
    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
    M24
    1.008"1.417"0.063"0.114"Top and Bottom5000000000000000
     
    Steel
    M24
    1.008"1.417"0.063"0.114"Top and Bottom500000000000000
     

    Tab Lock Washers

    Image of Product. Bottom orientation. Lock Washers. Tab-Lock Washer, 2 Tabs.

    2 Tabs

    Instead of relying on friction, these washers lock mechanically for more holding power than split and tooth lock washers. Bend the tabs with a wrench to stop both the fastener and washer from rotating. They are often used in applications with moderate vibration, such as motors, mixers, and pumps. These washers are not reusable because the tabs will weaken if you bend them repeatedly.
    Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
    2 Tabs—Also known as pantleg washers, these have two tabs for a more secure hold than washers with one tab. Bend one tab up against the flats of your nut or screw and the other tab down over the edge of your mounting surface.
    For Screw
    Size
    ID
    OD
    Thk.
    No. of
    Tabs
    Each
    Zinc-Plated Steel
    3/8"
    0.406"0.875"0.063"2000000000000
    1/2"
    0.531"1.125"0.063"200000000000
    3/4"
    0.781"1.5"0.063"200000000000
     
    back to top