Ethylene Propylene(EPDM)

Description: A copolymer of ethylene and propylene (EPR), combined with a third comonomer adiene(EPDM), Ethylene Propylene has gained wide seal industry acceptance for its excellent ozone and chemical resistance characteristics.

Key Use(s): Outdoor weather resistant uses. Automotive brake systems. Automobile cooling systems. Water applications. Low torque drive belts.

Temperature Range
Standard Compound: -40° to +275°F
Special Compound: -67° to +302°F

Hardness (Shore A): 40 to 95

Features: When compounded using peroxide curing agents high temperature service can reach +350°F.  Good resistance to acids and solvents (i.e. MEK and Acetone).

Limitations: Have no resistance to hydrocarbon fluids.

EPDM has outstanding resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight (-40ºF to +275ºF); but it is not recommended for gasoline, petroleum oil and grease, and hydrocarbon environments. This popular rubber compound is usually the first choice for low torque drive belt applications.

Neoprene(CR)

Description: Presently the seal industry’s most widely used and economical elastomer, Nitrile combines excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols, with a good balance of such desirable working properties as low compression set,high abrasion resistance,and high tensile strength.

Key Use(s): Low temperature military uses. Off-road equipment. Automotive, marine, aircraft fuel systems. Can be compounded for FDA applications.Oil resistant applications of all types.

Temperature Range
Standard Compound: -40° to +257°F

Hardness (Shore A): 40 to 90.

Features: Comprised of the copolymer butadiene and acrylonitrile, in varying proportions. Compounds can be formulated for service temperature ranging from -85°F to +275°F. Use of Carboxylated Nitrile can have superior abrasion resistance, while still having improved oil resistance.

Limitations: Nitrile compounds are attached by small amounts of Ozone. Phthalate type plasticizers are commonly used in compounding Nitrile Rubber. These plasticizers can migrate out and cause problems with certain plastics. Also, new regulations on certain phthalates have limited their use.

Nitrile (Buna-N) is the most widely used elastomer due to its excellent resistance to petroleum products, operating temperature range (-40°F to +257°F) and one of the best performance-to-cost values. It’s an ideal material for aerospace, automotive, propane and natural gas applications. Special Hydrogenated Nitrile (HNBR) compounds can improve resistance to direct ozone, sunlight, and weather exposure while increasing temperature range to +300°F.

What is an O-Ring?

An O-ring is a round ring that is used as a gasket for sealing a connection. O-rings are typically constructed out of polyurethane, silicone, neoprene, nitrile rubber or fluorocarbon. These rings are commonly used in mechanical applications, such as pipe connections, and help to ensure a tight seal between two objects. O-rings are designed to be seated in a groove or housing that keeps the ring in place. Once in its track, the ring is compressed between the two pieces and, in turn, creates a strong seal where they meet.

The seal that a rubber or plastic O-ring creates can either exist in a motionless joint, such as between piping, or a movable joint, such as a hydraulic cylinder. However, movable joints often require that the O-ring be lubricated. In a moving enclosure this ensures slower deterioration of the O-ring and therefore, extends the useful life of the product.

O-rings are both inexpensive and simple in design and are therefore very popular in manufacturing and industry. If mounted correctly, O-rings can withstand a very large amount of pressure and are therefore used in many applications where leaks or loss of pressure are unacceptable. For instance, O-rings used in hydraulic cylinders prevent leakage of hydraulic fluid and allow for the system to create and withstand the pressures required for operation.

O-rings are even used in highly technical construction such as space ships and other aircraft. A faulty O-ring was deemed the cause of the Space Shuttle Challenger catastrophe in 1986. An O-ring used in the manufacture of the solid rocket booster did not seal as expected due to the cold weather conditions upon launch. Consequently, the ship exploded after only 73 seconds into flight. This highlights the importance of the O-ring as well as its versatility.

Of course, different types of O-rings made out of different materials are used for various tasks. The O-ring needs to be matched to its application. Do not confuse however, similar inventions that are not round. These objects are brother to the O-ring and are instead simply called seals.

AS568 O-Ring Sizes

NOID×C/SNOID×C/SNOID×C/SNOID×C/S
AS568-0010.74×1.02AS568-1021.24×2.62AS568-157113.97×2.62AS568-23372.62×3.53
AS568-0021.07×1.27AS568-1032.06×2.62AS568-158120.32×2.62AS568-23475.79×3.53
AS568-0031.42×1.52AS568-1042.84×2.62AS568-159126.67×2.62AS568-23578.97×3.53
AS568-0041.78×1.78AS568-1053.63×2.62AS568-160133.02×2.62AS568-23682.14×3.53
AS568-0052.57×1.78AS568-1064.42×2.62AS568-161139.37×2.62AS568-23785.32×3.53
AS568-0062.90×1.78AS568-1075.23×2.62AS568-162145.72×2.62AS568-23885.32×3.53
AS568-0073.68×1.78AS568-1086.02×2.62AS568-163152.07×2.62AS568-23988.49×3.53
AS568-0084.47×1.78AS568-1097.59×2.62AS568-164158.42×2.62AS568-24091.67×3.53
AS568-0095.28×1.78AS568-1109.19×2.62AS568-165164.77×2.62AS568-24198.02×3.53
AS568-0106.07×1.78AS568-11110.77×2.62AS568-166171.12×2.62AS568-242101.19×3.53
AS568-0117.65×1.78AS568-11212.37×2.62AS568-167177.47×2.62AS568-243104.37×3.53
AS568-0129.25×1.78AS568-11313.94×2.62AS568-168183.82×2.62AS568-244107.54×3.53
AS568-01310.82×1.78AS568-11415.54×2.62AS568-169190.17×2.62AS568-245110.72×3.53
AS568-01412.42×1.78AS568-11517.12×2.62AS568-170196.52×2.62AS568-246113.89×3.53
AS568-01514.00×1.78AS568-11618.72×2.62AS568-171202.87×2.62AS568-247117.07×3.53
AS568-01615.60×1.78AS568-11720.29×2.62AS568-172209.22×2.62AS568-248120.24×3.53
AS568-01717.17×1.78AS568-11821.89×2.62AS568-173215.57×2.62AS568-249123.42×3.53
AS568-01818.77×1.78AS568-11923.47×2.62AS568-174221.92×2.62AS568-250126.59×3.53
AS568-01920.35×1.78AS568-12025.07×2.62AS568-175228.27×2.62AS568-251129.77×3.53
AS568-02021.95×1.78AS568-12126.64×2.62AS568-176234.62×2.62AS568-252132.94×3.53
AS568-02123.52×1.78AS568-12228.24×2.62AS568-177240.97×2.62AS568-253136.12×3.53
AS568-02225.12×1.78AS568-12329.82×2.62AS568-178247.32×2.62AS568-254139.29×3.53
AS568-02328.30×1.78AS568-12431.42×2.62AS568-179253.67×2.62AS568-255142.47×3.53
AS568-02429.87×1.78AS568-12532.99×2.62AS568-2014.34×3.53AS568-256145.64×3.53
AS568-02531.47×1.78AS568-12634.59×2.62AS568-2025.94×3.53AS568-257148.82×3.53
AS568-02633.05×1.78AS568-12736.17×2.62AS568-2037.52×3.53AS568-258151.99×3.53
AS568-02733.05×1.78AS568-12837.77×2.62AS568-2049.12×3.53AS568-259158.34×3.53
AS568-02834.65×1.78AS568-12939.34×2.62AS568-20510.69×3.53AS568-260164.69×3.53
AS568-02937.82×1.78AS568-13040.94×2.62AS568-20612.29×3.53AS568-261171.04×3.53
AS568-03041.00×1.78AS568-13142.52×2.62AS568-20713.87×3.53AS568-262177.39×3.53
AS568-03144.17×1.78AS568-13244.12×2.62AS568-20815.47×3.53AS568-263183.74×3.53
AS568-03247.35×1.78AS568-13345.69×2.62AS568-20917.04×3.53AS568-264190.09×3.53
AS568-03350.52×1.78AS568-13447.29×2.62AS568-21018.64×3.53AS568-265196.44×3.53
AS568-03453.70×1.78AS568-13548.90×2.62AS568-21120.22×3.53AS568-266202.79×3.53
AS568-03556.87×1.78AS568-13650.47×2.62AS568-21221.82×3.53AS568-267209.14×3.53
AS568-03660.05×1.78AS568-13752.07×2.62AS568-21323.39×3.53AS568-268215.49×3.53
AS568-03763.22×1.78AS568-13853.64×2.62AS568-21424.99×3.53AS568-269221.84×3.53
AS568-03866.40×1.78AS568-13955.25×2.62AS568-21526.57×3.53AS568-270228.19×3.53
AS568-03969.57×1.78AS568-14056.82×2.62AS568-21628.17×3.53AS568-271234.54×3.53
AS568-04072.75×1.78AS568-14158.42×2.62AS568-21729.74×3.53AS568-272240.89×3.53
AS568-04175.92×1.78AS568-14259.99×2.62AS568-21831.34×3.53AS568-273247.24×3.53
AS568-04282.27×1.78AS568-14361.60×2.62AS568-21932.92×3.53AS568-274253.59×3.53
AS568-04388.62×1.78AS568-14463.17×2.62AS568-22034.52×3.53AS568-275266.29×3.53
AS568-04494.97×1.78AS568-14564.77×2.62AS568-22136.09×3.53AS568-276278.99×3.53
AS568-045101.32×1.78AS568-14666.34×2.62AS568-22237.69×3.53AS568-277291.69×3.53
AS568-046107.67×1.78AS568-14767.95×2.62AS568-22340.87×3.53AS568-278304.39×3.53
AS568-047114.02×1.78AS568-14869.52×2.62AS568-22444.04×3.53AS568-279329.79×3.53
AS568-048120.37×1.78AS568-14971.12×2.62AS568-22547.22×3.53AS568-280355.19×3.53
AS568-049126.72×1.78AS568-15072.69×2.62AS568-22650.39×3.53AS568-281380.59×3.53
AS568-050133.07×1.78AS568-15175.87×2.62AS568-22753.57×3.53AS568-282405.26×3.53


AS568-15282.22×2.62AS568-22856.74×3.53AS568-283430.66×3.53


AS568-15388.57×2.62AS568-22959.92×3.53AS568-284456.06×3.53


AS568-15494.92×2.62AS568-23063.09×3.53


AS568-155101.27×2.62AS568-23166.27×3.53


AS568-156107.62×2.62AS568-23269.44×3.53
NOID×C/SNOID×C/SNOID×C/SNOID×C/S
AS568-30910.46×5.33AS568-360148.59×5.33AS568-425113.67×7.00AS568-9014.70×1.42
AS568-31012.07×5.33AS568-361151.77×5.33AS568-426116.84×7.00AS568-9026.07×1.63
AS568-31113.64×5.33AS568-362158.12×5.33AS568-427120.02×7.00AS568-9037.65×1.63
AS568-31215.24×5.33AS568-363164.47×5.33AS568-428123.19×7.00AS568-9048.92×1.83
AS568-31316.81×5.33AS568-364170.82×5.33AS568-429126.37×7.00AS568-90510.52×1.83
AS568-31418.42×5.33AS568-365177.17×5.33AS568-430129.54×7.00AS568-90611.89×1.98
AS568-31519.99×5.33AS568-366183.52×5.33AS568-431132.72×7.00AS568-90713.46×2.08
AS568-31621.59×5.33AS568-367189.87×5.33AS568-432135.89×7.00AS568-90816.36×2.21
AS568-31723.16×5.33AS568-368196.22×5.33AS568-433139.07×7.00AS568-90917.93×2.46
AS568-31824.77×5.33AS568-369202.57×5.33AS568-434142.24×7.00AS568-91019.18×2.46
AS568-31926.34×5.33AS568-370208.92×5.33AS568-435145.42×7.00AS568-91119.18×2.46
AS568-32027.94×5.33AS568-371215.27×5.33AS568-436148.59×7.00AS568-91223.47×2.95
AS568-32129.51×5.33AS568-372221.62×5.33AS568-437151.77×7.00AS568-91325.04×2.95
AS568-32231.12×5.33AS568-373227.97×5.33AS568-438158.12×7.00AS568-91426.59×2.95
AS568-32331.12×5.33AS568-374234.32×5.33AS568-439164.47×7.00AS568-91629.74×2.95
AS568-32434.29×5.33AS568-375240.67×5.33AS568-440170.82×7.00AS568-91834.42×2.95
AS568-32537.47×5.33AS568-376247.02×5.33AS568-441177.17×7.00AS568-92037.47×3.00
AS568-32640.64×5.33AS568-377253.37×5.33AS568-442183.52×7.00AS568-92853.09×3.00
AS568-32743.82×5.33AS568-378266.07×5.33AS568-443189.87×7.00AS568-93259.36×3.00
AS568-32846.99×5.33AS568-379278.77×5.33AS568-444196.22×7.00AS568-92037.47×3.00
AS568-32950.17×5.33AS568-380291.47×5.33AS568-445202.57×7.00

AS568-33053.34×5.33AS568-381304.17×5.33AS568-446215.27×7.00

AS568-33156.52×5.33AS568-382329.57×5.33AS568-447227.97×7.00

AS568-33259.69×5.33AS568-383354.97×5.33AS568-448240.67×7.00

AS568-33362.87×5.33AS568-384380.37×5.33AS568-449253.37×7.00

AS568-33466.04×5.33AS568-385405.26×5.33AS568-450266.07×7.00

AS568-33569.22×5.33AS568-386430.66×5.33AS568-451278.77×7.00

AS568-33672.39×5.33AS568-387456.06×5.33AS568-452291.47×7.00

AS568-33775.57×5.33AS568-388481.41×5.33AS568-453304.17×7.00

AS568-33878.74×5.33AS568-389506.81×5.33AS568-454316.87×7.00

AS568-33981.92×5.33AS568-390532.21×5.33AS568-455239.57×7.00

AS568-34085.09×5.33AS568-391557.61×5.33AS568-456342.27×7.00

AS568-34188.27×5.33AS568-392582.68×5.33AS568-457354.97×7.00

AS568-34291.44×5.33AS568-393608.08×5.33AS568-458380.37×7.00

AS568-34394.62×5.33AS568-394633.48×5.33AS568-459380.37×7.00

AS568-34497.79×5.33AS568-395658.88×5.33AS568-460393.07×7.00

AS568-345100.97×5.33

AS568-461405.26×7.00

AS568-346104.14×5.33

AS568-462417.96×7.00

AS568-347107.32×5.33

AS568-463430.66×7.00

AS568-348110.49×5.33

AS568-464443.36×7.00

AS568-349113.67×5.33

AS568-465456.06×7.00

AS568-350116.84×5.33

AS568-466468.76×7.00

AS568-351120.02×5.33

AS568-467481.46×7.00

AS568-352123.19×5.33

AS568-468494.16×7.00

AS568-353126.37×5.33

AS568-469506.86×7.00

AS568-354129.54×5.33

AS568-470532.26×7.00

AS568-355132.72×5.33

AS568-471557.66×7.00

AS568-356135.89×5.33

AS568-472582.68×7.00

AS568-357139.07×5.33

AS568-473608.08×7.00

AS568-358142.24×5.33

AS568-474633.48×7.00

AS568-359145.42×5.33

AS568-475658.88×7.00

O ring Seals

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Ningbo RoBon sealing.oil seal, seal, framework oil seal imports, V-seals, V-mix fabric seals, valve seals, J-no skeleton oil seal, U-free skeleton seal, seal manufacturers, seals, seal products, hydraulic and pneumatic seals, O-rings, O-rubber seals, O-rings, O-rings, fluorine rubber O-rings, silicone O-ring, rubber seal ring, silicone ring, silicone rubber products, O-ring, O-ring, J-no seal, valve seal, seal, high pressure hose, low pressure hose, Gyrosigma hose, suction hose , rubber insulation pipes, nitrile rubber O-ring, NBRO-rings, hydraulic and pneumatic seals, FMKO-rings, high pressure hose fittings, hydraulic pipe fittings, polyurethane sheet, silicone rubber sheet, V-shaped sealed metal hose ring, Y-shaped seals, U-ring, L-ring, J-shaped dust seals, V, U, fabric clip-shaped rubber seals, kdas combination of circle, la bud-shaped ring, VD (A) Rubber ring, VD (S)-type rubber seals, rubber hydraulic coupling Used Plum pad, core-shaped flexible coupling, DKB reciprocating metal skeleton movement with dust seals incompetent, DKI-type dust ring seals, dust Seal the hole with a rotating cell to ring, ring combination (box to circle, Manchester seal), nylon, nylon resin pipe, conveyor, conveyor belt rollers, and other more than two thousand species, widely used in petroleum use O-rings, O-ring with the chemical, metallurgical O-ring, O-ring with mining, construction machinery with O-ring, O-ring with a beer equipment, transportation and use of O-ring, ship with the O-ring, O-ring and other textile industries.

O-ring products: O-rings, O-rubber seals, O-rings, O-rings, fluorine rubber O-rings, silicone O-rings, rubber seals, silicone seals, silicone rubber products, O- seals, O-ring, J-no seal, valve seal, seal, high pressure hose, low pressure hose, Gyrosigma hose, suction hose, rubber insulation pipes, nitrile rubber O-ring , NBR O-rings, hydraulic and pneumatic seals, FMKO-rings, high pressure hose fittings, hydraulic pipe fittings, polyurethane sheet, silicone rubber sheet, V-shaped ring metal hose, Y-ring, U-shaped ring, L-shaped ring, J-shaped dust seals, V, U, fabric clip-shaped rubber seals, kdas combination of circle, la bud-shaped ring, VD (A)-type rubber seals, VD (S)-type liquid rubber seals Used rubber mat plum coupling strength, core-shaped flexible coupling, DKB reciprocating metal skeleton movement with dust seals incompetent, DKI-type dust ring seals, dust seals, holes with a rotating cell to ring, ring combination (box to circle, Manchester seal), nylon products, nylon resin pipe, conveyor, conveyor belt rollers, and other more than two thousand species, widely used in petroleum use O-ring, O-ring with the chemical, metallurgical with O-ring, O-ring with mining, construction machinery with O-ring, O-ring beer equipment, transportation with O-ring, O-ring for shipbuilding, textile O-ring and other industries.

BS1516 British Standard  O-ring Sizes

N OID×C/SN OID×C/SN OID×C/SN OID×C/S
BS-1516-12.90×1.78BS-1516-2432.92×3.53BS-1516-4797.79×5.34BS-1516-70189.86×6.99
BS-1516-23.68×1.78BS-1516-2534.52×3.53BS-1516-48100.96×5.34BS-1516-71196.22×6.99
BS-1516-34.47×1.78BS-1516-2636.09×3.53BS-1516-49104.14×5.34BS-1516-72202.56×6.99
BS-1516-45.28×1.78BS-1516-2737.69×3.53BS-1516-50107.32×5.34BS-1516-73215.26×6.99
BS-1516-56.07×1.78BS-1516-2837.46×5.34BS-1516-51110.49×5.34BS-1516-74227.96×6.99
BS-1516-67.65×1.78BS-1516-2940.64×5.34BS-1516-52113.66×5.34BS-1516-75240.66×6.99
BS-1516-79.25×1.78BS-1516-3043.82×5.34BS-1516-53116.84×6.99BS-1516-76253.36×6.99
BS-1516-89.19×2.62BS-1516-3146.99×5.34BS-1516-54120.02×6.99BS-1516-77266.06×6.99
BS-1516-910.77×2.62BS-1516-3250.16×5.34BS-1516-55123.19×6.99BS-1516-78278.76×6.99
BS-1516-1012.37×2.62BS-1516-3353.34×5.34BS-1516-56126.36×6.99BS-1516-79291.46×6.99
BS-1516-1113.94×2.62BS-1516-3456.52×5.34BS-1516-57129.54×6.99BS-1516-80304.16×6.99
BS-1516-1215.54×2.62BS-1516-3559.69×5.34BS-1516-58132.72×6.99BS-1516-81316.86×6.99
BS-1516-1317.12×2.62BS-1516-3662.86×5.34BS-1516-59135.89×6.99BS-1516-82329.56×6.99
BS-1516-1418.72×2.62BS-1516-3766.04×5.34BS-1516-60139.06×6.99BS-1516-83342.26×6.99
BS-1516-1518.64×3.53BS-1516-3869.22×5.34BS-1516-61142.24×6.99BS-1516-84354.96×6.99
BS-1516-1620.22×3.53BS-1516-3972.39×5.34BS-1516-62145.42×6.99BS-1516-85367.66×6.99
BS-1516-1721.82×3.53BS-1516-4075.56×5.34BS-1516-63148.59×6.99BS-1516-86380.36×6.99
BS-1516-1823.39×3.53BS-1516-4178.74×5.34BS-1516-64151.76×6.99BS-1516-87393.06×6.99
BS-1516-1924.99×3.53BS-1516-4281.92×5.34BS-1516-65158.12×6.99BS-1516-88413.60×6.99
BS-1516-2026.57×3.53BS-1516-4385.09×5.34BS-1516-66164.46×6.99
BS-1516-2128.17×3.53BS-1516-4488.26×5.34BS-1516-67170.82×6.99
BS-1516-2229.74×3.53BS-1516-4591.44×5.34BS-1516-68177.16×6.99
BS-1516-2331.34×3.53BS-1516-4694.62×5.34BS-1516-69183.52×6.99

JIS P G  size O ring

NOID×C/SNOID×C/SNOID×C/SNOID×C/S
P32.8×1.9P48A47.6×5.7P205204.5×8.4G2524.4×3.1
P43.8×1.9P4948.7×3.5P209208.5×8.4G3029.4×3.1
P54.8×1.9P5049.7×3.5P210209.5×8.4G3534.4×3.1
P65.8×1.9P50A49.6×5.7P215214.5×8.4G4039.4×3.1
P76.8×1.9P5251.6×5.7P220219.5×8.4G4544.4×3.1
P87.8×1.9P5352.6×5.7P225224.5×8.4G5049.4×3.1
P98.8×1.9P5554.6×5.7P230229.4×8.4G5554.4×3.1
P109.8×1.9P5655.6×5.7P235234.5×8.4G6059.4×3.1
P10A9.8×2.4P5857.6×5.7P240239.5×8.4G6564.4×3.1
P1110.8×2.4P6059.6×5.7P245244.5×8.4G7069.4×3.1
P11.211.0×2.4P6261.6×5.7P250249.5×8.4G7574.4×3.1
P1211.8×2.4P6362.6×5.7P255254.5×8.4G8079.4×3.1
P12.512.3×2.4P6564.6×5.7P260259.5×8.4G8584.4×3.1
P1413.8×2.4P6766.6×5.7P265264.5×8.4G9089.4×3.1
P1514.8×2.4P7069.6×5.7P270269.5×8.4G9594.4×3.1
P1615.8×2.4P7170.6×5.7P275274.5×8.4G10099.4×3.1
P1817.8×2.4P7574.6×5.7P280279.5×8.4G105104.4×3.1
P2019.8×2.4P8079.6×5.7P285284.5×8.4G110109.4×3.1
P2120.8×2.4P8584.6×5.7P290289.5×8.4G115114.4×3.1
P2221.8×2.4P9089.6×5.7P295294.5×8.4G120119.4×3.1
P22A21.7×3.5P9594.6×5.7P300299.5×8.4G125124.4×3.1
P22.422.1×3.5P10099.6×5.7P315314.5×8.4G130129.4×3.1
P2423.7×3.5P102101.6×5.7P320319.5×8.4G135134.4×3.1
P2524.7×3.5P105109.6×5.7P335334.5×8.4G140139.4×3.1
P25.525.2×3.5P110109.6×5.7P340339.5×8.4G145144.4×3.1
P2625.7×3.5P112111.6×5.7P355354.5×8.4G150149.3×5.7
P2827.7×3.5P115114.6×5.7P360359.5×8.4G155154.3×5.7
P2928.7×3.5P120119.6×5.7P375374.5×8.4G160159.3×5.7
P29.529.2×3.5P125124.6×5.7P385384.5×8.4G165164.3×5.7
P3029.7×3.5P130129.6×5.7P400399.5×8.4G170169.3×5.7
P3130.7×3.5P132131.6×5.7

G175174.3×5.7
P31.531.2×3.5P135134.6×5.7

G180179.3×5.7
P3231.7×3.5P140139.6×5.7

G185184.3×5.7
P3433.7×3.5P145144.6×5.7

G190189.3×5.7
P3534.7×3.5P150149.6×5.7

G195194.3×5.7
P35.535.2×3.5P150A149.5×8.4

G200199.3×5.7
P3635.7×3.5P155154.5×8.4

G210209.3×5.7
P3837.7×3.5P160159.5×8.4

G220219.3×5.7
P3938.7×3.5P165164.5×8.4

G230229.3×5.7
P4039.7×3.5P170169.5×8.4

G240239.3×5.7
P4140.7×3.5P175174.5×8.4

G250249.3×5.7
P4240.7×3.5P180179.5×8.4

G260259.3×5.7
P4443.7×3.5P185184.5×8.4

G270269.3×5.7
P4544.7×3.5P190189.5×8.4

G280279.3×5.7
P4645.7×3.5P195194.5×8.4

G290289.3×5.7
P4847.7×3.5P200199.5×8.4

G300299.3×5.7

JIS S Series o ring size

MARYLAND METRICS – Technical Data Chart
TECHNICAL DOCUMENTATION O-RINGS – JIS Sizes S Series
SizeIDC/S (W)
IDC/S (W)

mm±mm
in±in±
S32.50.151.5
0.0980.0060.0590.004
S43.50.151.5
0.1380.0060.0590.004
S54.50.151.5
0.1770.0060.0590.004
S65.50.151.5
0.2170.0060.0590.004
S76.50.151.5
0.2560.0060.0590.004
S87.50.151.5
0.2950.0060.0590.004
S98.50.151.5
0.3350.0060.0590.004
S109.50.151.5
0.3740.0060.0590.004
S11.210.70.151.5
0.4210.0060.0590.004
S1211.50.151.5
0.4530.0060.0590.004
S12.512.00.151.5
0.4720.0060.0590.004
S1413.50.151.5
0.5310.0060.0590.004
S1514.50.151.5
0.5710.0060.0590.004
S1615.50.151.5
0.6100.0060.0590.004
S1817.50.151.5
0.6890.0060.0590.004
S2019.50.151.5
0.7680.0060.0590.004
S2221.50.151.5
0.8460.0060.0590.004
S22.421.90.152.0
0.8620.0060.0790.004
S2423.50.152.0
0.9250.0060.0790.004
S2524.50.152.0
0.9650.0060.0790.004
S2625.50.152.0
1.0040.0060.0790.004
S2827.50.152.0
1.0830.0060.0790.004
S2928.50.152.0
1.1220.0060.0790.004
S3029.50.152.0
1.1610.0060.0790.004
S31.531.00.152.0
1.2200.0060.0790.004
S3231.50.152.0
1.2400.0060.0790.004
S3433.50.152.0
1.3190.0060.0790.004
S3534.50.152.0
1.3580.0060.0790.004
S35.535.00.152.0
1.3780.0060.0790.004
S3635.50.152.0
1.3980.0060.0790.004
S3837.50.152.0
1.4760.0060.0790.004
S3938.50.152.0
1.5160.0060.0790.004
S4039.50.152.0
1.5550.0060.0790.004
S4241.50.252.0
1.6340.0100.0790.004
S4443.50.252.0
1.7130.0100.0790.004
S4544.50.252.0
1.7520.0100.0790.004
S4645.50.252.0
1.7910.0100.0790.004
S4847.50.252.0
1.8700.0100.0790.004
S5049.50.252.0
1.9490.0100.0790.004
S5352.50.252.0
2.0670.0100.0790.004
S5554.50.252.0
2.1460.0100.0790.004
S5655.50.252.0
2.1850.0100.0790.004
S6059.50.252.0
2.3430.0100.0790.004
S6362.50.252.0
2.4610.0100.0790.004
S6564.50.252.0
2.5390.0100.0790.004
S6766.50.252.0
2.6180.0100.0790.004
S7069.50.252.0
2.7360.0100.0790.004
S7170.50.402.0
2.7760.0160.0790.004
S7574.50.402.0
2.9330.0160.0790.004
S8079.50.402.0
3.1300.0160.0790.004
S8584.50.402.0
3.3270.0160.0790.004
S9089.50.402.0
3.5240.0160.0790.004
S9594.50.402.0
3.7200.0160.0790.004
S10099.50.402.0
3.9170.0160.0790.004
S105104.50.402.0
4.1140.0160.0790.004
S110109.50.402.0
4.3110.0160.0790.004
S112111.50.402.0
4.3900.0160.0790.004
S115114.50.402.0
4.5080.0160.0790.004
S120119.50.402.0
4.7050.0160.0790.004
S125124.50.402.0
4.9020.0160.0790.004
S130129.50.602.0
5.0980.0240.0790.004
S132131.50.602.0
5.1770.0240.0790.004
S135134.50.602.0
5.2950.0240.0790.004
S140139.50.602.0
5.4920.0240.0790.004
S145144.50.602.0
5.6890.0240.0790.004
S150149.50.602.0
5.8860.0240.0790.004

Set ring and the main purpose of the performance

Ring, the general nitrile rubber, natural rubber, chloroprene rubber, ethylene-propylene rubber, fluorine rubber, silicone rubber and blends manufacture. In addition to the O-outside there are triangular, rectangular, D-, T-, square, heart-shaped, X-type, five edge-type, olive and so on.

The nature of the
According to the different materials used in seals, have different properties on the classification of
1 high temperature seals
2 high pressure seal
3 corrosion-resistant seal
4 wear ring

The role of various types of seals

1.V-ring
Is a function of the axial elastic rubber ring, as a non-pressure shaft seal. Sealing lip activity and better adaptability to compensate for greater tolerance and angle of deviation, to prevent internal leakage of grease or oil out, but also to prevent splashing water or dust from outside intrusion.

2.O-ring
Mainly used for static seals and reciprocating seals. Seals for rotating movement, the only low-speed rotary seals.

3.V-ring
Generally installed in the cylindrical or rectangular cross-section on the inner circle of the seal groove.

4.Y-ring
Widely used in reciprocating dynamic sealing devices.

In addition, spring tension (spring accumulator) ring, PTFE sealing material is being added in a spring, O-type spring, V-springs, U-type spring.

Gaskets leakage

General gasket leakage in four forms: interface leakage, infiltration leakage, diffusion leakage, destruction of leakage.

Leak interface: interface gasket compression is not enough, Flange finish improper flange deformation and so leak in the seal interface. For Interface World leakage, padded anti-material clamping flange.

Penetration leakage: are fibers of the material of soft material, easy to medium dip fitness, especially the pressure. Due to capillary phenomenon, the media will penetrate into the low voltage side, the formation of penetration.

Diffusion leakage: concentration difference driven by the media material passing through the seal gaps or sealing material capillary leak. Diffusion is the result of molecular motion, and is not a one-way street. Minimal seal differential pressure or vacuum or seal such as nitrogen, hydrogen permeable material, as well as highly toxic, radioactive materials, paying particular attention to the penetration and diffusion of two kinds of leakage.

Leakage of destruction: in a sealed area is relatively poor working conditions, thermal deformation and large, often subject to vibration, impact, improper installation, excessive force, used repeatedly, compressive deformation, internal stress concentration, more than the fatigue strength and destruction, material aging , deterioration, etc. can cause damage leak. This leak caused, endangering large, to enhance preventive measures.