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    60 Products

    Mil. Spec. Washers

    Image of Product. Front orientation. Washers. Mil. Spec. Washers.
    These washers are manufactured and tested to strict U.S. military standards for material and construction. They take the pressure off screws and nuts to protect mounting surfaces.
    AluminumAbout Aluminum
    One-third the weight of steel, these washers are commonly used in robotics, automation, and other applications that have weight limits. They're an alternative to stainless steel for rust resistance.
    Corrosion-Resistant 1100 Aluminum—The best corrosion resistance of all the aluminum washers we offer. These are common in chemical and food processing industries since they stand up to salt water, mild acids, and detergents. However, they aren't as strong as 2024 aluminum.
    For Screw
    Size
    ID
    OD
    Thk.
    Mil.
    Spec.
    Pkg.
    Qty.
    Pkg.
    Corrosion-Resistant 1100 Aluminum
    7/16"
    		0.443"0.683"0.048" to 0.054"AN901-4A5094589A44000000
    1/2"
    		0.505"0.745"0.048" to 0.054"AN901-5A5094589A4500000
    9/16"
    		0.568"0.808"0.048" to 0.054"AN901-6A5094589A46000000
    3/4"
    		0.755"0.995"0.048" to 0.054"AN901-8A5094589A47000000
    7/8"
    		0.880"1.120"0.048" to 0.054"AN901-10A2594589A4800000
    1"
    		1.068"1.370"0.048" to 0.054"AN901-12A1094589A4900000
    1 1/4"
    		1.318"1.620"0.048" to 0.054"AN901-16A1094589A5100000
    1 5/8"
    		1.630"1.870"0.048" to 0.054"AN901-20A1094589A5200000
     

    Peel-Away Multilayer Shims

    Image of Product. Front orientation. Shims. Sold Individually, Peel Away, Multilayer, Round.
    Fine-tune thickness without worrying about stacking multiple shims. These shims are 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 shims to soften the adhesive. With thickness tolerances as fine as a strand of hair, all of these shims precisely align, space, and level components on shafts, arbors, and machinery.
    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.
    Thk.
    Thk. Tolerance
    ID Tolerance
    OD Tolerance
    No. of
    Layers
    Layer
    Thk.
    Min.
    Hardness
    Each
    Aluminum
     
    3/8" ID × 5/8" OD
    0.032"-0.002" to 0.003"-0.01" to 0.01"-0.01" to 0.01"160.002"Not Rated92850A40000000
    0.062"-0.002" to 0.006"-0.01" to 0.01"-0.01" to 0.01"310.002"Not Rated92850A6000000
     
    1/2" ID × 3/4" OD
    0.032"-0.002" to 0.003"-0.01" to 0.01"-0.01" to 0.01"160.002"Not Rated92850A4050000
    0.062"-0.002" to 0.006"-0.01" to 0.01"-0.01" to 0.01"310.002"Not Rated92850A60500000
     
    5/8" ID × 1" OD
    0.032"-0.002" to 0.003"-0.01" to 0.01"-0.01" to 0.01"160.002"Not Rated92850A41000000
    0.125"-0.003" to 0.012"-0.01" to 0.01"-0.01" to 0.01"620.002"Not Rated92850A81000000
     
    1" ID × 1 1/2" OD
    0.062"-0.002" to 0.006"-0.01" to 0.01"-0.01" to 0.01"310.002"Not Rated92850A62500000
    0.125"-0.003" to 0.012"-0.01" to 0.01"-0.01" to 0.01"620.002"Not Rated92850A82500000
     
    1 1/2" ID × 2 1/8" OD
    0.125"-0.003" to 0.012"-0.01" to 0.01"-0.01" to 0.01"620.002"Not Rated92850A84000000
     

    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.
    Thk.
    Thk. Tolerance
    ID
    Tolerance
    OD Tolerance
    Min.
    Hardness
    Pkg.
    Qty.
    Pkg.
    Aluminum
     
    3/8" ID × 5/8" OD
    0.005"-0.0005" to 0.0005"0" to 0.011"-0.002" to 0.002"Not Rated1092661A53100000
    0.01"-0.001" to 0.001"0" to 0.011"-0.002" to 0.002"Not Rated1092661A57800000
     
    1/2" ID × 3/4" OD
    0.005"-0.0005" to 0.0005"0" to 0.011"-0.002" to 0.002"Not Rated1092661A53300000
    0.01"-0.001" to 0.001"0" to 0.011"-0.002" to 0.002"Not Rated1092661A58000000
     
    5/8" ID × 1" OD
    0.005"-0.0005" to 0.0005"0" to 0.011"-0.002" to 0.002"Not Rated1092661A53500000
    0.01"-0.001" to 0.001"0" to 0.011"-0.002" to 0.002"Not Rated1092661A58200000
     
    3/4" ID × 1 1/8" OD
    0.005"-0.0005" to 0.0005"0" to 0.011"-0.002" to 0.002"Not Rated592661A5370000
    0.01"-0.001" to 0.001"0" to 0.011"-0.002" to 0.002"Not Rated1092661A58400000
     
    1" ID × 1 1/2" OD
    0.01"-0.001" to 0.001"0" to 0.011"-0.002" to 0.002"Not Rated592661A58800000
     

    Slotted Shims

    Image of ProductInUse. Front orientation. Shims. Precision Adjust, Slot, Sold Individually.
    Image of Product. Front orientation. Shims. Precision Adjust, Slot, Sold Individually, Square 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.
    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.
    Slot
    Thk.
    Thk. Tolerance
    For Max.
    Screw Size
    Wd.
    Dp.
    Min.
    Hardness
    Identification
    Type
    Color
    End
    Shape
    Pkg.
    Qty.
    Pkg.
    Painted Aluminum
     
    1 1/2" Lg. × 1 1/2" Wd. (Shim Trade Size AA)
    0.01"-0.001" to 0.001"5/16"
    		3/8"15/16"Not RatedColor CodedBrownSquare209302K01500000
     
    2" Lg. × 2" Wd. (Shim Trade Size A)
    0.01"-0.001" to 0.001"3/8"
    		7/16"1 7/32"Not RatedColor CodedBrownSquare209302K310000
     
    3" Lg. × 3" Wd. (Shim Trade Size B)
    0.01"-0.001" to 0.001"1/2"
    		9/16"1 25/32"Not RatedColor CodedBrownSquare109302K5100000
     
    4" Lg. × 4" Wd. (Shim Trade Size C)
    0.01"-0.001" to 0.001"7/8"
    		1"2 1/2"Not RatedColor CodedBrownSquare109302K8100000
     

    Peel-Away Multilayer Made-to-Order Shims

    Image of Product. Front orientation. Shims. Multilayer, Sold Individually, Made-to-Order, Peel Away.
    If you need a unique peel-away shim shape or size, we’ll precision cut it for you. Use these shims to fine-tune thickness without worrying about stacking multiple shims. They're 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 shims to soften the adhesive. With thickness tolerances as fine as a strand of hair, all of these shims precisely align, space, and level components on shafts, arbors, and machinery.
    Send your dimensioned DWG, DXF, IGES, or STEP file to sales@mcmaster.com. Please leave at least 1/8" wall between shim edge and holes. Minimum hole size is 1/4". Shims should be no smaller than 1" × 1" square or 1" OD. Maximum shim dimension is the largest overall length, width, or diameter of your custom shim.
    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.
    Material Certificate—Shims include a report with a traceable lot number.
    2" × 2" Maximum
    Shim Size
    5" × 5" Maximum
    Shim Size
    7" × 7" Maximum
    Shim Size
    11" × 11" Maximum
    Shim Size
    23" × 23" Maximum
    Shim Size
    Thk.
    Thk. Tolerance
    No. of
    Layers
    Layer
    Thk.
    Min.
    Hardness
    Specs. Met
    Certificate Type
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Aluminum
    0.008"-0.0004" to 0.0004"40.002"Not RatedASTM B209, SAE AMS-DTL-22499Material Certificate
    		1611885N434000000411885N441000000911885N4470000000411885N4540000000111885N4610000000
    0.016"-0.0008" to 0.0008"80.002"Not RatedASTM B209, SAE AMS-DTL-22499Material Certificate
    		1611885N43500000411885N44200000911885N448000000411885N455000000111885N462000000
    0.032"-0.0016" to 0.0016"160.002"Not RatedASTM B209, SAE AMS-DTL-22499Material Certificate
    		1611885N43600000411885N44300000911885N449000000411885N456000000111885N463000000
    0.048"-0.0024" to 0.0024"240.002"Not RatedASTM B209, SAE AMS-DTL-22499Material Certificate
    		1611885N43700000411885N44400000911885N451000000411885N457000000111885N464000000
    0.062"-0.0031" to 0.0031"320.002"Not RatedASTM B209, SAE AMS-DTL-22499Material Certificate
    		1611885N438000000411885N445000000911885N452000000411885N458000000111885N465000000
    0.124"-0.0062" to 0.0062"620.002"Not RatedASTM B209, SAE AMS-DTL-22499Material Certificate
    		1611885N439000000411885N446000000911885N453000000411885N459000000111885N466000000
     
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