McMaster-Carr logo
    Filter by
    System of Measurement
    For Use With
    Maximum Pressure for Gases
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    DFARS Specialty Metals
    Enclosure Rating
    Industrial Info Compare
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    102 Products

    High-Pressure Bonded Sealing Washers

    Tested to hold up to high pressures, these washers create the strongest seal of all to lock in air and fluid and keep equipment running efficiently. They are often used on flanged connections to prevent leaks in pumps, hydraulic systems, compressors, and other pressurized lines. The flexible rubber or plastic layer compresses to fills gaps, while the metal backing stops the washer from squeezing through the hole.
    For Screw Heads
    Image of ProductInUse. Front orientation. CrossSection view. Sealing Washers. High-Pressure Bonded Sealing Washers, For Screw Heads.
    Image of Product. Front orientation. Sealing Washers. High-Pressure Bonded Sealing Washers, For Screw Heads.
    Fit under screw heads to stop leaks. These washers seal best on screws that aren't threaded all the way up to the head. Reuse them a handful of times, as long as the material isn't damaged.
    Oil-Resistant Zinc-Plated Steel and Buna-N—These washers won't swell or soften when they touch oil, grease, and fuel. However, they will degrade if exposed to synthetic lubricants. They are also are more susceptible to rusting than 18-8 and 316 stainless steel.
    Chemical-Resistant 18-8 Stainless Steel and Fluoroelastomer—These washers resist corrosion better than zinc-plated steel, so they're less likely to rust in wet and outdoor environments. The seal withstands high temperatures and won't degrade when exposed to acids, alcohols, solvents, synthetic lubricants, and harsh detergents.
    Max.
    Pressure, psi
    Temp.
    Range, ° F
    For Screw
    Size
    ID
    OD
    Thk.
    For
    Fluids
    For
    Gases
    Min.
    Max.
    Color
    Pkg.
    Qty.
    Pkg.
    Oil-Resistant Zinc-Plated Steel and Buna-N
    No. 4
    0.102"0.25"0.035" to 0.045"7,000200-10240Black1093783A005000000
    No. 6
    0.13"0.385"0.036" to 0.044"10,800200-40225Black1093783A00700000
    No. 8
    0.156"0.385"0.036" to 0.044"8,000200-40225Black193783A0090000
    No. 10
    0.18"0.443"0.045" to 0.055"6,200200-40225Black193783A0110000
    1/4"
    0.24"0.505"0.045" to 0.055"5,000200-40225Black1093783A02900000
    5/16"
    0.301"0.603"0.045" to 0.055"3,600200-40225Black1093783A03000000
    3/8"
    0.364"0.666"0.045" to 0.055"3,400200-40225Black1093783A03100000
    7/16"
    0.427"0.76"0.045" to 0.055"3,600200-40225Black593783A03200000
    1/2"
    0.49"0.88"0.045" to 0.055"4,200200-40225Black1093783A03300000
    9/16"
    0.552"1.067"0.045" to 0.055"6,600200-30225Black593783A03400000
    5/8"
    0.615"1.193"0.045" to 0.055"7,500200-40225Black593783A03500000
    3/4"
    0.74"1.322"0.059" to 0.069"5,700200-40225Black593783A03600000
    7/8"
    0.864"1.51"0.059" to 0.069"6,000200-30225Black193783A0460000
    1"
    0.988"1.76"0.059" to 0.069"7,000200-40225Black193783A0510000
    1 1/8"
    1.106"1.885"0.059" to 0.069"4,900200-10240Black193783A0560000
    1 1/4"
    1.229"2.01"0.059" to 0.069"4,600200-10240Black193783A0610000
    M2
    1.8 mm4.5 mm0.9 mm to 1.1 mm7,300200-10240Black1093786A50100000
    M2.5
    2.2 mm5.0 mm0.9 mm to 1.1 mm6,600200-10240Black1093786A50200000
    M3
    2.7 mm6.0 mm0.9 mm to 1.1 mm6,400200-10240Black1093786A50300000
    M4
    3.7 mm7.0 mm0.9 mm to 1.1 mm5,500200-10240Black1093786A50400000
    M5
    4.8 mm9.8 mm0.9 mm to 1.2 mm15,200200-30220Black593786A10000000
    M6
    5.8 mm11.3 mm1.1 mm to 1.4 mm12,800200-30220Black593786A12500000
    M8
    7.8 mm13.5 mm1.1 mm to 1.4 mm7,900200-30220Black593786A15000000
    M10
    9.7 mm15.3 mm1.1 mm to 1.4 mm7,200200-30220Black593786A17500000
    M12
    11.7 mm19.3 mm1.1 mm to 1.4 mm7,100200-30220Black593786A20000000
    M14
    13.7 mm22.4 mm1.1 mm to 1.4 mm8,000200-30220Black593786A22500000
    M16
    15.7 mm27.1 mm1.1 mm to 1.4 mm12,500200-30220Black593786A25000000
    M20
    19.6 mm33.3 mm1.5 mm to 1.8 mm4,900200-10240Black593786A30000000
    M22
    21.6 mm31.4 mm1.1 mm to 1.4 mm3,700200-10240Black593786A32500000
    M24
    23.7 mm43.9 mm1.5 mm to 1.8 mm5,500200-10240Black193786A3500000
     
    Chemical-Resistant 18-8 Stainless Steel and Fluoroelastomer
    M5
    4.8 mm9.8 mm0.9 mm to 1.1 mm3,7002000390Black1090467A20500000
    M6
    5.8 mm11.3 mm1.1 mm to 1.4 mm3,6002000390Black1090467A20600000
    M8
    7.8 mm13.5 mm1.1 mm to 1.4 mm3,1002000390Black590467A20800000
    M10
    9.7 mm15.3 mm1.1 mm to 1.4 mm2,7002000390Black590467A21000000
    M12
    11.7 mm19.3 mm1.1 mm to 1.4 mm2,9002000390Black590467A21200000
    M14
    13.6 mm22.3 mm1.1 mm to 1.4 mm2,9002000390Black190467A2140000
    M16
    15.6 mm27.1 mm1.1 mm to 1.4 mm3,1002000390Black190467A2160000
    M20
    19.6 mm33.3 mm1.5 mm to 1.8 mm3,0002000390Black190467A22000000
     
    For Nuts
    Image of ProductInUse. Front orientation. CrossSection view. Sealing Washers. High-Pressure Bonded Sealing Washers, For Nuts.
    Image of Product. Front orientation. Sealing Washers. High-Pressure Bonded Sealing Washers, For Nuts.
    Commonly used under nuts, these washers wedge into threads to prevent liquids or gases from trickling along the length of the screw. Reuse them a handful of times, as long as the material isn't damaged.
    Oil-Resistant Zinc-Plated Steel and Buna-N—These washers won't swell or soften when they touch oil, grease, and fuel. However, they will degrade if exposed to synthetic lubricants. They are also are more susceptible to rusting than 18-8 and 316 stainless steel.
    Max.
    Pressure
    Temp.
    Range, ° F
    For Screw
    Size
    ID
    OD
    Thk.
    For Fluids,
    psi
    For
    Gases
    Min.
    Max.
    Color
    Pkg.
    Qty.
    Pkg.
    Oil-Resistant Zinc-Plated Steel and Buna-N
    No. 6
    0.141"0.406"0.045" to 0.055"2,000Not Rated-30220Black593781A008000000
    No. 8
    0.167"0.406"0.045" to 0.055"2,000Not Rated-30220Black593781A01000000
    No. 10
    0.194"0.469"0.045" to 0.055"2,000Not Rated-30220Black593781A01100000
    1/4"
    0.255"0.562"0.045" to 0.055"5,000Not Rated-30220Black593781A02900000
    5/16"
    0.319"0.687"0.059" to 0.069"5,000Not Rated-30220Black593781A03700000
    3/8"
    0.383"0.750"0.059" to 0.069"5,000Not Rated-30220Black593781A03800000
    7/16"
    0.447"0.906"0.073" to 0.083"5,000Not Rated-30220Black593781A03200000
    1/2"
    0.510"1.000"0.073" to 0.083"5,000Not Rated-30220Black593781A03300000
    5/8"
    0.638"1.187"0.089" to 0.099"5,000Not Rated-30220Black593781A03500000
    3/4"
    0.765"1.375"0.104" to 0.114"5,000Not Rated-30220Black193781A0390000
    1"
    1.020"1.750"0.115" to 0.125"5,000Not Rated-30220Black193781A05100000
     
    For Screw Heads and Nuts
    Image of ProductInUse. Front orientation. CrossSection view. Sealing Washers. High-Pressure Bonded Sealing Washers, For Screw Heads and Nuts.
    Image of Product. Front orientation. Sealing Washers. High-Pressure Bonded Sealing Washers, For Screw Heads and Nuts.
    Install these washers under screw heads and nuts. When compressed, the PVC sealant squeezes into every crevice, creating an impervious 360° seal that stops liquids or gases from trickling along the length of the screw. These washers are not reusable.
    18-8 Stainless Steel and PVC—The PVC sealant resists acids, alcohols, solvents, and detergents. However, the metal is more likely to rust than 316 stainless steel.
    Chemical-Resistant 316 Stainless Steel and PVC—Every part of these washers resists acids, alcohols, solvents, and other aggressive substances. They are commonly used in harsh environments, such chemical processing plants.
    Max.
    Pressure, psi
    Temp.
    Range, ° F
    For Screw
    Size
    ID
    OD
    Thk.
    For
    Fluids
    For
    Gases
    Min.
    Max.
    Color
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel and PVC
    No. 6
    0.148"0.495"0.06" to 0.07"8,5008,500-60270Black2590736A120000000
    No. 8
    0.175"0.495"0.06" to 0.07"8,5008,500-60270Black2590736A13000000
    No. 10
    0.205"0.56"0.06" to 0.07"8,5008,500-60270Black2590736A14000000
    1/4"
    0.255"0.625"0.068" to 0.078"8,5008,500-60270Black1090736A1500000
    5/16"
    0.315"0.685"0.072" to 0.082"8,5008,500-60270Black1090736A1600000
    3/8"
    0.385"0.81"0.077" to 0.087"8,5008,500-60270Black1090736A1700000
    7/16"
    0.445"0.89"0.085" to 0.095"8,5008,500-60270Black590736A1800000
    1/2"
    0.51"0.99"0.085" to 0.095"8,5008,500-60270Black590736A1900000
     
    Chemical-Resistant 316 Stainless Steel and PVC
    No. 4
    0.124"0.396"0.05" to 0.06"8,5008,500-60270Black2094154A0050000
    No. 6
    0.148"0.495"0.06" to 0.07"8,5008,500-60270Black2094154A1000000
    No. 8
    0.175"0.495"0.06" to 0.07"8,5008,500-60270Black2094154A2000000
    No. 10
    0.205"0.56"0.06" to 0.07"8,5008,500-60270Black2094154A30000000
    1/4"
    0.255"0.625"0.068" to 0.078"8,5008,500-60270Black1594154A4000000
    5/16"
    0.315"0.685"0.072" to 0.082"8,5008,500-60270Black1594154A5000000
    3/8"
    0.385"0.81"0.077" to 0.087"8,5008,500-60270Black1094154A6000000
    1/2"
    0.51"0.99"0.085" to 0.095"8,5008,500-60270Black594154A80000000
    5/8"
    0.639"1.135"0.085" to 0.095"8,5008,500-60270Black194154A8050000
    3/4"
    0.77"1.28"0.105" to 0.115"8,5008,500-60270Black194154A8100000
    7/8"
    0.893"1.44"0.105" to 0.115"8,5008,500-60270Black194154A8150000
    1"
    1.018"1.6"0.105" to 0.115"8,5008,500-60270Black194154A8200000
     

    Washdown Bonded Sealing Washers

    Image of Product. Bottom orientation. Sealing Washers. Washdown Bonded Sealing Washers.
    Maintain the washdown rating of your enclosure, even after drilling holes in it. These washers protect against high-volume jets of water, as well as dirt, ice, oil, and coolant. The flexible rubber layer compresses to fill gaps, while the metal backing stops the washer from squeezing through the hole. Reuse these washers a handful of times, as long as the material isn't damaged.
    High-Temperature 18-8 Stainless Steel and Silicone—These washers resist freezing and scorching temperatures without deforming or losing strength.
    Max.
    Pressure, psi
    Temp.
    Range, ° F
    Each
    For Screw
    Size
    ID
    OD
    Thk.
    For
    Fluids
    For
    Gases
    Min.
    Max.
    Color
    For Enclosure
    Rating
    1-99
    100-249
    250-Up
    High-Temperature 18-8 Stainless Steel and Silicone
    No. 6
    0.123"0.55"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A120000000000000000
    No. 6
    0.123"1"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A126000000000000
    No. 8
    0.175"0.55"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A121000000000000
    No. 8
    0.175"1"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A104000000000000
    No. 8
    0.175"1.5"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A1300000000000000
    No. 10
    0.2"0.55"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A122000000000000
    No. 10
    0.2"1"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A105000000000000
    1/4"
    0.265"0.75"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A123000000000000
    1/4"
    0.265"1"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A107000000000000
    1/4"
    0.265"1.5"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A1320000000000000
    5/16"
    0.325"0.75"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A124000000000000
    5/16"
    0.325"1"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A111000000000000
    5/16"
    0.325"1.5"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A1330000000000000
    3/8"
    0.385"0.75"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A125000000000000
    3/8"
    0.385"1"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A112000000000000
    3/8"
    0.385"1.5"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A1340000000000000
    7/16"
    0.422"1"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A127000000000000
    7/16"
    0.422"1.5"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A1350000000000000
    1/2"
    0.485"1"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A128000000000000
    1/2"
    0.485"1.5"0.047" to 0.109"100100-100400GreenIP66, IP68
    91195A1360000000000000
    M3
    2.9 mm14 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A137000000000000
    M3
    2.9 mm25.4 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A138000000000000
    M4
    3.9 mm14 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A139000000000000
    M4
    3.9 mm25.4 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A140000000000000
    M5
    4.9 mm14 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A141000000000000
    M5
    4.9 mm19.1 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A142000000000000
    M5
    4.9 mm25.4 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A143000000000000
    M6
    5.9 mm19.1 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A144000000000000
    M6
    5.9 mm25.4 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A145000000000000
    M8
    7.8 mm19.1 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A146000000000000
    M8
    7.8 mm25.4 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A147000000000000
    M10
    9.8 mm25.4 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A148000000000000
    M12
    11.8 mm25.4 mm2 mm to 2.1 mm100100-100400RedIP66, IP68
    91195A149000000000000
     
    back to top