McMaster-Carr logo
    Filter by
    System of Measurement
    Thickness
    For Use In
    Sleeve OD
    Attribute Image
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    DFARS Specialty Metals
    Industrial Info Compare
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Fastener Strength Grade/Class
    Specifications Met
    Edge Type
    Sleeve Height
    Attribute Image
    Overall Height
    Attribute Image
    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)
    32 Products

    Leveling Washers for I-Beams

    Image of ProductInUse. Mounted on an I-Beam. Front orientation. Leveling Washers. Leveling Washers for I-Beams.

    Mounted

    on an

    I-Beam

    Image of Product. Front orientation. Contains Annotated. Leveling Washers. Leveling Washers for I-Beams.
    Commonly called beveled washers, these are tapered to fit inside an I-beam's flange to provide a parallel bearing surface.
    Black-Oxide Iron—Black-oxide iron washers have a matte-black finish that prevents corrosion in dry environments.
    Galvanized Iron—Galvanized iron washers are corrosion resistant in wet environments.
    Aluminum—Aluminum washers are lightweight and corrosion resistant in wet environments.
    18-8 Stainless Steel—18-8 stainless steel washers have good chemical resistance and may be mildly magnetic. These washers are the most corrosion-resistant option.
    Thk.
    For Screw
    Size
    ID
    Wd.
    (A)
    (B)
    Hardness
    Pkg.
    Qty.
    Pkg.
    Iron
    3/8"
    		0.438"1.250"0.344"0.156"Rockwell B832591151A031000000
    1/2"
    		0.562"1.250"0.344"0.156"Rockwell B832591151A03300000
    5/8"
    		0.688"1.500"0.406"0.156"Rockwell B831091151A03500000
     
    Black-Oxide Iron
    3/8"
    		0.438"1.250"0.344"0.156"Rockwell B831091228A11300000
    1/2"
    		0.562"1.250"0.344"0.156"Rockwell B831091228A11400000
    5/8"
    		0.688"1.500"0.406"0.156"Rockwell B83591228A11500000
     
    Galvanized Iron
    3/8"
    		0.438"1.250"0.344"0.156"Rockwell B831091152A03100000
    1/2"
    		0.562"1.250"0.344"0.156"Rockwell B831091152A03300000
    5/8"
    		0.688"1.500"0.406"0.156"Rockwell B831091152A03500000
     
    Aluminum
    3/8"
    		0.438"1.250"0.344"0.156"Not Rated592810A13000000
    1/2"
    		0.562"1.250"0.344"0.156"Not Rated592810A14000000
    5/8"
    		0.688"1.500"0.406"0.156"Not Rated592810A15000000
     
    18-8 Stainless Steel
    1/2"
    		0.562"1.250"0.344"0.156"Rockwell B45190845A0380000
     

    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.
    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, ° F
    For Screw
    Size
    Ht.
    OD
    ID
    OD
    Thk.
    Overall
    Ht.
    Min.
    Max.
    Color
    Pkg.
    Qty.
    Pkg.
    Nylon
    7/8"
    		0.344"0.995"0.885"1.250"0.156"0.500"-40180Off-White2591145A306000000
     
    Extra-High-Temperature Ceramic
    No. 10
    		0.062"0.468"0.200"0.750"0.156"0.218"Not Rated1,700Off-White592107A41800000
     

    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
    5/8"
    		0.641"1.073"0.156"—ASME B18.21.12592146A03500000————0
     
    Highly Corrosion-Resistant 316 Stainless Steel
    5/8"
    		0.641"1.073"0.156"—ASME B18.21.11092147A0350000————0
     
    Zinc-Plated Steel
    5/8"
    		0.641"1.073"0.156"—ASME B18.21.15091102A0350000————0
     
    Zinc-Yellow-Chromate-Plated Steel
    5/8"
    		0.641"1.073"0.156"SAE Grade 8
    		ASME B18.21.15091104A03500000————0
     
    Black-Oxide Steel
    5/8"
    		0.641"1.073"0.156"—ASME B18.21.1105185N1170000————0
     
    Steel
    5/8"
    		0.641"1.073"0.156"—ASME B18.21.15091101A2350000050091101A035000000
     
    Corrosion-Resistant Galvanized Steel
    5/8"
    		0.641"1.073"0.156"—ASME B18.21.12595160A2400000————0
     
    Highly Corrosion-Resistant Zinc-Flake-Coated Steel
    5/8"
    		0.641"1.073"0.156"—ASME B18.21.155185N1350000————0
     
    Aluminum
    5/8"
    		0.641"1.073"0.156"—ASME B18.21.11091013A73300000————0
     
    Highly Corrosion-Resistant Silicon Bronze
    5/8"
    		0.641"1.073"0.156"—ASME B18.21.1593496A4350000————0
     

    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
    5/8"
    		0.634"1.073"0.156"ASME B18.21.1192353A13000000
     

    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.
    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 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.
    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.
    Passivated 18-8 Stainless Steel
    5/8"
    		0.628"1.073"0.156"MS35338-145ASME B18.21.11091475A035000000
     
    Black-Oxide 18-8 Stainless Steel
    5/8"
    		0.628"1.073"0.156"MS35338-145ASME B18.21.1291475A5090000
     
    Highly Corrosion-Resistant Passivated 316 Stainless Steel
    5/8"
    		0.628"1.073"0.156"MS35338-145ASME B18.21.1391475A7400000
     
    Zinc-Yellow-Chromate-Plated Steel
    5/8"
    		0.628"1.073"0.156"MS35338-50ASME B18.21.11091475A3420000
     
    Corrosion-Resistant Cadmium-Plated Steel
    5/8"
    		0.628"1.073"0.156"MS35338-50ASME B18.21.1291475A8200000
     
    back to top