McMaster-Carr logo
    Filter by
    System of Measurement
    Thickness
    End Shape
    Sold As
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Shim Trade Size
    Finish
    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)
    93 Products

    Slotted Shims

    Image of ProductInUse. Front orientation. Shims. Precision Adjust, Slot, Sold Individually.
    Image of Product. Front orientation. Shims. Precision Adjust, Slot, Sold Individually, Tab End.
    Image of Product. Front orientation. Shims. Precision Adjust, Slot, Sold Individually, Square End.

    Tab End

    Square End

    Slip these shims around existing mounting fasteners to precisely align and level components such as pumps, compressors, and gearboxes with motors, all without disassembling them. They’re also good for leveling machines on uneven surfaces. To reduce sizing errors, these shims are either labeled with their thickness so there's no need to measure or color coded by thickness to quickly spot the right size.
    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.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these shims resist rust. However, they’ll corrode or pit when exposed to salt water and chemicals.
    Painted 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.
    Plastic—Softer than metal, these shims won't mar delicate surfaces and they will never rust.
    Insertion Tools—Ease shim insertion and removal, keeping your fingers clear in the process.
    Shims
    Insertion Tools
    Slot
    Each
    Package
    Thk.
    Thk. Tolerance
    For Max.
    Screw Size
    Wd.
    Dp.
    Min.
    Hardness
    Identification
    Type
    Color
    End
    Shape
    Each
    Pkg.
    Qty.
    Pkg.
    Each
    18-8 Stainless Steel
     
    1" Lg. × 1" Wd. (Shim Trade Size AAA)
    0.06"-0.003" to 0.003"1/4"
    		5/16"5/8"Rockwell B70Labeled—Tab0000000000000020000000000000000000000000000
     
    1 1/2" Lg. × 1 1/2" Wd. (Shim Trade Size AA)
    0.06"-0.003" to 0.003"3/8"
    		7/16"61/64"Rockwell B85Labeled—Tab0000000000000200000000000000000000000000
     
    2" Lg. × 2" Wd. (Shim Trade Size A)
    0.06"-0.003" to 0.003"1/2"
    		9/16"1 9/32"Rockwell B85Labeled—Tab0000000000002000000000000000000000000000
     
    2 1/2" Lg. × 2 1/2" Wd. (Shim Trade Size BB)
    0.06"-0.003" to 0.003"5/8"
    		11/16"1 19/32"Rockwell B85Labeled—Tab000000000000020000000000000000000000000000
     
    3" Lg. × 3" Wd. (Shim Trade Size B)
    0.06"-0.003" to 0.003"3/4"
    		13/16"1 29/32"Rockwell B85Labeled—Tab000000000000200000000000000000000000000
     
    4" Lg. × 4" Wd. (Shim Trade Size C)
    0.06"-0.003" to 0.003"1 1/8"
    		1 3/16"2 19/32"Rockwell B85Labeled—Tab0000000000002000000000000000000000000000
     
    5" Lg. × 5" Wd. (Shim Trade Size D)
    0.06"-0.003" to 0.003"1 1/2"
    		1 9/16"3 9/32"Rockwell B85Labeled—Tab00000000000020000000000000000000000000000
     
    6" Lg. × 5" Wd. (Shim Trade Size DD)
    0.06"-0.003" to 0.003"1 1/2"
    		1 9/16"4 1/2"Rockwell B70Labeled—Tab0000000000000020000000000000000———0
     
    6" Lg. × 6" Wd. (Shim Trade Size E)
    0.06"-0.003" to 0.003"1 7/8"
    		1 15/16"4"Rockwell B85Labeled—Tab0000000000000020000000000000000000000000000
     
    6" Lg. × 6" Wd. (Shim Trade Size G)
    0.06"-0.003" to 0.003"2 1/4"
    		2 5/16"4 3/16"Rockwell B85Labeled—Tab0000000000000020000000000000000000000000000
     
    8" Lg. × 8" Wd. (Shim Trade Size H)
    0.06"-0.003" to 0.003"2 1/4"
    		2 5/16"5 3/16"Rockwell B85Labeled—Tab00000000000000200000000000000000000000000000
     
    Painted Aluminum
     
    2" Lg. × 2" Wd. (Shim Trade Size A)
    0.06"-0.006" to 0.006"3/8"
    		7/16"1 7/32"Not RatedColor CodedGraySquare———020000000000000———0
     
    3" Lg. × 3" Wd. (Shim Trade Size B)
    0.06"-0.006" to 0.006"1/2"
    		9/16"1 25/32"Not RatedColor CodedGraySquare———010000000000000———0
     
    Plastic
     
    1 1/2" Lg. × 1 1/2" Wd. (Shim Trade Size AA)
    0.06"-0.006" to 0.006"5/16"
    		3/8"15/16"—Color CodedClearSquare———050000000000000———0
     
    2" Lg. × 2" Wd. (Shim Trade Size A)
    0.06"-0.006" to 0.006"3/8"
    		7/16"1 7/32"—Color CodedClearSquare———010000000000000———0
     
    3" Lg. × 3" Wd. (Shim Trade Size B)
    0.06"-0.006" to 0.006"1/2"
    		9/16"1 25/32"—Color CodedClearSquare———05000000000000———0
     
    4" Lg. × 4" Wd. (Shim Trade Size C)
    0.06"-0.006" to 0.006"7/8"
    		1"2 1/2"—Color CodedClearSquare———0100000000000———0
     

    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.
    Highly-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these shims won't degrade when exposed to harsh weather, salt water, and most chemicals.
    Ultra-Chemical-Resistant PTFE—The most chemical-resistant shims we offer, these stand up to the widest range of harsh acids, bases, solvents, and corrosive cleaners, even at temperatures up to 500° F. They also won't mar delicate surfaces.
    Thk.
    Thk. Tolerance
    ID
    Tolerance
    OD Tolerance
    Min.
    Hardness
    Color
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    Highly-Corrosion-Resistant 316 Stainless Steel
     
    1/8" ID × 3/16" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A2405000000000000000
     
    3/16" ID × 1/4" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A240500000000000000
     
    1/4" ID × 3/8" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A24050000000000000
     
    5/16" ID × 19/32" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A2401000000000000000
     
    11/32" ID × 13/16" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A240100000000000000
     
    3/8" ID × 5/8" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A2401000000000000000
     
    1/2" ID × 3/4" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A2401000000000000000
     
    5/8" ID × 1" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A240500000000000000
     
    3/4" ID × 1 1/8" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A240500000000000000
     
    7/8" ID × 1 3/8" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A2401000000000000000
     
    1" ID × 1 1/2" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A240500000000000000
     
    1 1/8" ID × 1 5/8" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A24050000000000000
     
    1 1/4" ID × 1 3/4" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A24050000000000000
     
    1 3/8" ID × 1 7/8" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A24050000000000000
     
    1 1/2" ID × 2 1/8" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A24050000000000000
     
    1 3/4" ID × 2 3/4" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A240500000000000000
     
    2" ID × 2 3/4" OD
    0.06"-0.004" to 0.004"0" to 0.011"-0.002" to 0.002"Rockwell B70—ASTM A240500000000000000
     
    Ultra-Chemical-Resistant PTFE
     
    1/4" ID × 3/8" OD
    0.06"-0.007" to 0.007"0" to 0.015"-0.01" to 0.01"—White—1000000000000000
     
    3/8" ID × 5/8" OD
    0.06"-0.007" to 0.007"0" to 0.015"0" to 0.015"—White—1000000000000000
     
    1/2" ID × 3/4" OD
    0.06"-0.007" to 0.007"0" to 0.015"-0.01" to 0.01"—White—1000000000000000
     
    5/8" ID × 1" OD
    0.06"-0.007" to 0.007"0" to 0.015"0" to 0.015"—White—500000000000000
     
    3/4" ID × 1 1/8" OD
    0.06"-0.007" to 0.007"0" to 0.015"-0.01" to 0.01"—White—500000000000000
     
    1" ID × 1 1/2" OD
    0.06"-0.007" to 0.007"0" to 0.015"-0.01" to 0.01"—White—500000000000000
     

    Shims for Shortening Screw Shoulders

    Image of ProductInUse. Front orientation. Contains Annotated. Shims. Sold Individually, Shoulder Shortening, Round.
    Image of Product. Front orientation. Shims. Sold Individually, Shoulder Shortening, Round.
    Pare down the shoulder on shoulder screws. Slide these shims under the screw head to create the length you need. Use them to tighten the hold on bearings, pulleys, and sprockets, or shorten the length of travel along the shoulder.
    You can stack multiple shims to achieve the exact shoulder length or space you need.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these shims resist rust. However, they’ll corrode or pit when exposed to salt water and chemicals.
    Stress-Resistant Spring Steel—These shims are harder and hold their shape better than carbon steel. Use them for high-stress applications, such as leveling heavy machinery. They're best for dry environments since moisture will cause them to rust.
    Thk.
    Thk. Tolerance
    For Screw
    Size
    ID
    ID Tolerance
    OD
    OD Tolerance
    Min.
    Hardness
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
     
    For 1/8" Diameter Shoulder
    0.06"-0.004" to 0.004"No. 4
    		1/8"0" to 0.012"1/4"-0.005" to 0.002"Rockwell B70500000000000000
     
    For 3/16" Diameter Shoulder
    0.06"-0.004" to 0.004"No. 8
    		3/16"0" to 0.012"5/16"-0.005" to 0.002"Rockwell B7050000000000000
     
    For 1/4" Diameter Shoulder
    0.06"-0.0035" to 0.0035"No. 10
    		1/4"0" to 0.012"3/8"-0.005" to 0.002"Rockwell B70250000000000000
     
    For 5/16" Diameter Shoulder
    0.06"-0.0035" to 0.0035"1/4"
    		5/16"0" to 0.012"7/16"-0.005" to 0.002"Rockwell B70250000000000000
     
    For 3/8" Diameter Shoulder
    0.06"-0.0035" to 0.0035"5/16"
    		3/8"0" to 0.012"9/16"-0.005" to 0.002"Rockwell B70250000000000000
     
    For 1/2" Diameter Shoulder
    0.06"-0.0035" to 0.0035"3/8"
    		1/2"0" to 0.012"3/4"-0.005" to 0.002"Rockwell B70250000000000000
     
    For 5/8" Diameter Shoulder
    0.06"-0.0035" to 0.0035"1/2"
    		5/8"0" to 0.012"7/8"-0.005" to 0.002"Rockwell B70100000000000000
     
    For 3/4" Diameter Shoulder
    0.06"-0.0035" to 0.0035"5/8"
    		3/4"0" to 0.012"1"-0.005" to 0.002"Rockwell B701000000000000000
     
    For 1" Diameter Shoulder
    0.06"-0.0035" to 0.0035"7/8"
    		1"0" to 0.012"1 1/4"-0.005" to 0.002"Rockwell B701000000000000000
     
    Stress-Resistant Spring Steel
     
    For 6 mm Diameter Shoulder
    0.06"-0.004" to 0.004"M6
    		6 mm0 mm to 0.25 mm9.78 mm-0.25 mm to 0 mmRockwell C4050000000000000
     
    For 8 mm Diameter Shoulder
    0.06"-0.004" to 0.004"M8
    		8 mm0 mm to 0.25 mm12.73 mm-0.25 mm to 0 mmRockwell C4050000000000000
     
    For 10 mm Diameter Shoulder
    0.06"-0.004" to 0.004"M10
    		10 mm0 mm to 0.25 mm15.73 mm-0.25 mm to 0 mmRockwell C4050000000000000
     
    For 12 mm Diameter Shoulder
    0.06"-0.004" to 0.004"M12
    		12 mm0 mm to 0.25 mm17.73 mm-0.25 mm to 0 mmRockwell C4050000000000000
     
    For 16 mm Diameter Shoulder
    0.06"-0.004" to 0.004"M16
    		16 mm0 mm to 0.25 mm23.67 mm-0.25 mm to 0 mmRockwell C4050000000000000
     
    For 20 mm Diameter Shoulder
    0.06"-0.004" to 0.004"M20
    		20 mm0 mm to 0.25 mm29.67 mm-0.25 mm to 0 mmRockwell C4050000000000000
     

    Shim Stock

    Image of Product. Front orientation. Shim Stock. Sold Individually.
    Cut into custom shapes to create shims that suit your needs. With thickness tolerances as fine as a strand of hair, the shims will precisely align, space, and level components on dies, presses, 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.
    Ultra-Chemical-Resistant PTFE—The most chemical-resistant shim stock we offer, it stands up to the widest range of harsh acids, bases, solvents, and corrosive cleaners, even at temperatures up to 500° F. It also won't mar delicate surfaces.
    Plastic—Softer than metal, it won't mar delicate surfaces and it will never rust.
    Thk.
    Thk. Tolerance
    Color
    Specs. Met
    Form
    Each
    Ultra-Chemical-Resistant PTFE
     
    8" Wide × 12" Long
    0.06"-0.006" to 0.006"WhiteASTM D3308, MIL-P-22241Sheet000000000000
     
    12" Wide × 24" Long
    0.06"-0.006" to 0.006"WhiteASTM D3308, MIL-P-22241Roll0000000000000
     
    20" Wide × 50" Long
    0.06"-0.006" to 0.006"WhiteASTM D3308, MIL-P-22241Roll0000000000000
     
    Plastic
     
    5" Wide × 20" Long
    0.06"-0.006" to 0.006"Clear—Sheet00000000000
     
    10" Wide × 20" Long
    0.06"-0.006" to 0.006"Clear—Sheet000000000000
     
    12" Wide × 24" Long
    0.06"-0.006" to 0.006"Clear—Sheet0000000000000
     
    20" Wide × 20" Long
    0.06"-0.006" to 0.006"Clear—Sheet000000000000
     
    20" Wide × 50" Long
    0.06"-0.006" to 0.006"Clear—Sheet0000000000000
     

    Shims for D-Profile Shafts

    Image of Product. Front orientation. Shims. For D-Profile Shafts, Sold Individually, Round.
    With a partially flat inside surface, these shims won’t spin out of position to precisely align and space components on D-profile shafts and arbors.
    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
    ID Tolerance
    OD
    OD Tolerance
    Flat
    Wd.
    Min.
    Hardness
    Each
    Carbon Steel
     
    For 3/8" Diameter Shafts
    0.06"-0.003" to 0.003"0.385"-0.01" to 0.01"5/8"-0.01" to 0.01"0.173"Rockwell B60000000000000000
     
    For 1/2" Diameter Shafts
    0.06"-0.003" to 0.003"0.51"-0.01" to 0.01"3/4"-0.01" to 0.01"0.235"Rockwell B6000000000000000
     
    For 5/8" Diameter Shafts
    0.06"-0.003" to 0.003"0.635"-0.01" to 0.01"1"-0.01" to 0.01"0.298"Rockwell B6000000000000000
     
    For 3/4" Diameter Shafts
    0.06"-0.003" to 0.003"0.76"-0.01" to 0.01"1 1/8"-0.01" to 0.01"0.36"Rockwell B6000000000000000
     
    For 1" Diameter Shafts
    0.06"-0.003" to 0.003"1.01"-0.01" to 0.01"1 1/2"-0.01" to 0.01"0.485"Rockwell B6000000000000000
     
    For 1 1/4" Diameter Shafts
    0.06"-0.003" to 0.003"1.26"-0.01" to 0.01"1 3/4"-0.01" to 0.01"0.61"Rockwell B6000000000000000
     

    Wide-Rim Shims

    Image of Product. Front orientation. Shims. Wide Rim, Round, Sold Individually.
    Spread loads across a wider surface area than standard shims to minimize costly wear between components. 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 1/8" ID × 1 3/4" OD
    0.06"-0.007" to 0.007"0.01" to 0.025"-0.01" to 0.01"Rockwell B381000000000000000
     
    1 3/8" ID × 2 1/8" OD
    0.06"-0.007" to 0.007"0.01" to 0.025"-0.01" to 0.01"Rockwell B3810000000000000
     
    2" ID × 3" OD
    0.06"-0.007" to 0.007"0.01" to 0.025"-0.01" to 0.01"Rockwell B3810000000000000
     

    Shims for Keyed Shafts

    With a notch or tab, these shims fit snugly on keyed shafts to align and space gears, sprockets, and bearings. On keyed arbors, they’re often used to accurately space saw blades and cutters.
    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.
    Notch
    Image of Product. Front orientation. Shims. For Keyed Shafts, Sold Individually, Round, Notch.
    Fit these shims around keyed shafts and arbors that have a key inserted. They’re often referred to as arbor spacers.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these shims resist rust. However, they’ll corrode or pit when exposed to salt water and chemicals.
    Notch
    Thk.
    Thk. Tolerance
    ID
    ID
    Tolerance
    OD
    OD Tolerance
    Wd.
    Dp.
    Min.
    Hardness
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
     
    For 1" Diameter Shafts
    0.06"-0.0035" to 0.0035"1"0" to 0.011"1 1/2"-0.002" to 0.002"1/4"3/32"Rockwell B805000000000000000
     
    For 1 1/4" Diameter Shafts
    0.06"-0.0035" to 0.0035"1 1/4"0" to 0.011"1 3/4"-0.002" to 0.002"5/16"1/8"Rockwell B80500000000000000
     
    For 1 1/2" Diameter Shafts
    0.06"-0.0035" to 0.0035"1 1/2"0" to 0.011"2 1/8"-0.002" to 0.002"3/8"5/32"Rockwell B80500000000000000
     
    For 2" Diameter Shafts
    0.06"-0.0035" to 0.0035"2"0" to 0.011"2 3/4"-0.002" to 0.002"1/2"3/16"Rockwell B8010000000000000
     
    back to top