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    38 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"7,000200-10240Black10000000000000000
    No. 6
    0.13"0.385"0.036" to 0.044"10,800200-40225Black1000000000000000
    No. 8
    0.156"0.385"0.036" to 0.044"8,000200-40225Black10000000000000
    No. 10
    0.18"0.443"0.045" to 0.055"6,200200-40225Black10000000000000
    1/4"
    0.24"0.505"0.045" to 0.055"5,000200-40225Black1000000000000000
    5/16"
    0.301"0.603"0.045" to 0.055"3,600200-40225Black1000000000000000
    3/8"
    0.364"0.666"0.045" to 0.055"3,400200-40225Black1000000000000000
    7/16"
    0.427"0.76"0.045" to 0.055"3,600200-40225Black500000000000000
    1/2"
    0.49"0.88"0.045" to 0.055"4,200200-40225Black1000000000000000
    9/16"
    0.552"1.067"0.045" to 0.055"6,600200-30225Black500000000000000
    5/8"
    0.615"1.193"0.045" to 0.055"7,500200-40225Black500000000000000
    3/4"
    0.74"1.322"0.059" to 0.069"5,700200-40225Black500000000000000
    7/8"
    0.864"1.51"0.059" to 0.069"6,000200-30225Black10000000000000
    1"
    0.988"1.76"0.059" to 0.069"7,000200-40225Black10000000000000
    1 1/8"
    1.106"1.885"0.059" to 0.069"4,900200-10240Black10000000000000
    1 1/4"
    1.229"2.01"0.059" to 0.069"4,600200-10240Black10000000000000
    M2
    1.8 mm4.5 mm0.9 mm to 1.1 mm7,300200-10240Black1000000000000000
    M2.5
    2.2 mm5.0 mm0.9 mm to 1.1 mm6,600200-10240Black1000000000000000
    M3
    2.7 mm6.0 mm0.9 mm to 1.1 mm6,400200-10240Black1000000000000000
    M4
    3.7 mm7.0 mm0.9 mm to 1.1 mm5,500200-10240Black1000000000000000
    M5
    4.8 mm9.8 mm0.9 mm to 1.2 mm15,200200-30220Black500000000000000
    M6
    5.8 mm11.3 mm1.1 mm to 1.4 mm12,800200-30220Black500000000000000
    M8
    7.8 mm13.5 mm1.1 mm to 1.4 mm7,900200-30220Black500000000000000
    M10
    9.7 mm15.3 mm1.1 mm to 1.4 mm7,200200-30220Black500000000000000
    M12
    11.7 mm19.3 mm1.1 mm to 1.4 mm7,100200-30220Black500000000000000
    M14
    13.7 mm22.4 mm1.1 mm to 1.4 mm8,000200-30220Black500000000000000
    M16
    15.7 mm27.1 mm1.1 mm to 1.4 mm12,500200-30220Black500000000000000
    M20
    19.6 mm33.3 mm1.5 mm to 1.8 mm4,900200-10240Black500000000000000
    M22
    21.6 mm31.4 mm1.1 mm to 1.4 mm3,700200-10240Black500000000000000
    M24
    23.7 mm43.9 mm1.5 mm to 1.8 mm5,500200-10240Black10000000000000
     
    Chemical-Resistant 18-8 Stainless Steel and Fluoroelastomer
    M5
    4.8 mm9.8 mm0.9 mm to 1.1 mm3,7002000390Black1000000000000000
    M6
    5.8 mm11.3 mm1.1 mm to 1.4 mm3,6002000390Black1000000000000000
    M8
    7.8 mm13.5 mm1.1 mm to 1.4 mm3,1002000390Black500000000000000
    M10
    9.7 mm15.3 mm1.1 mm to 1.4 mm2,7002000390Black500000000000000
    M12
    11.7 mm19.3 mm1.1 mm to 1.4 mm2,9002000390Black500000000000000
    M14
    13.6 mm22.3 mm1.1 mm to 1.4 mm2,9002000390Black10000000000000
    M16
    15.6 mm27.1 mm1.1 mm to 1.4 mm3,1002000390Black10000000000000
    M20
    19.6 mm33.3 mm1.5 mm to 1.8 mm3,0002000390Black100000000000000
     
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