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O-Rings

Information regarding various O-ring materials, as well as a universal chart of part numbers and dimensions. Click here to skip down to the chart right away.

NBR, Nitrile, or Buna-N Rubber

(Acrylonitrile-Butadiene Copolymers) Compounds of these polymers form the backbone of our line of gaskets. Polymers vary from 18% to 50% acrylonitrile content. Resistance to petroleum products increases as acrylonitrile content increases; conversely, low-temperature flexibility decreases. Government specifications require compounds containing low levels of acrylonitrile for -65°F performance at a sacrifice of fuel, oil and high-temperature resistance. Nitrile compounds have excellent compression set, tear and abrasion resistance. Unless especially compounded, they have low resistance to ozone, sunlight, and weather. In service, they should not be stretched more than 5% or stored near motors or other ozone-generating electrical equipment. They should be kept out of direct sunlight. They are used for general purpose oil, water and air, silicone oils and grease, Di-ester base lubricants and ethylene glycol base antifreeze fluids at temperatures from as low as -65°F to as high as 275°F. They should not be used with carbon tetrachloride or trichloroethylene cleaning fluids, nitrobenzene, aniline, phosphate ester fluids, ketones, strong acids or automotive brake fluids.

Silicone Rubber

(Dow Corning®, General Electric®, Union Carbide® or Stauffer-Wacker®) Silicone has good tensile, tear and abrasion resistance, but are not recommended for dynamic seals. They have excellent low-temperature flexibility, some to as low as -175°F. In dry heat, 450°F is the maximum recommended operating temperature for continuous duty, with 600°F possible for short periods. They are not recommended for low aniline petroleum fluids, ketones, or aromatics, but are used primarily for dry heat static seals. Many silicone compounds have high mold shrinkage. Parts produced in standard O-ring molds are undersized and require Class II tolerances. Others are available which mold to Class I tolerances.

Fluorocarbon Rubber

(Viton® or fluoroelastomers) These compounds have excellent mechanical, chemical and heat resistance, being able to withstand 400°F continuous temperatures and will take 600°F for short periods of time. They are recommended for petroleum oils and grease, Di-ester and Silicate ester base lubricants, silicone fluids and greases, halogenated hydrocarbons, strong acids by special compounding (except for hot hydrofluoric or chloro-sulfonic acid), and some phosphate ester fluids (except Skydrol®). They should not be used with ketones such as MEK and acetone, amines, anhydrous ammonia, or low molecular weight alcohols, esters or ethers. They are especially good for hard vacuum service because of their high molecular weight and low gas permeability. They have been used at -65°F in some static seals. Because of high molding shrinkage, FPM O-rings require Class II tolerances.

See technical properties regarding elastomers for more information (click here).

Universal O-Ring Chart

How to Order: Please note the first 2 numbers indicate the material. Check the table for corresponding size numbers for each O-ring size, then add universal size number in place of XXX.

Please note that all sizes listed in the table below are nominal dimensions. Actual dimensions are slightly greater than what is listed. For example, a 1/8″ (0.125″) O-ring, while certainly rated for 1/8″ applications, is actually 0.139″. Please contact us if you have any questions before ordering!

O-Ring Part Number Key

71XXX: Viton (Brown)*
74XXX: Silicone
74XXX-WS: White Silicone
74XXX-TL: Translucent Silicone
75XXX: Buna-N (Black)
75XXX-W: White Buna-N
76XXX: EPDM
7XXXX-VI: Class VI Version
95XXX: Buna (90 Durometer)
3XXX-T: PTFE
*Both black and blue Viton are also available for certain sizes. Contact us for more information.

Universal Series Dash Numbers, Inside & Outside Diameters, Width

#IDODCS
-0011/32"3/32"1/32"
-001½1/16"1/8"1/32"
-0023/64"9/64"3/64"
-0031/16"3/16"1/16"
-0045/64"13/64"1/16"
-0053/32"7/32"1/16"
-0061/8"1/4"1/16"
-0075/32"9/32"1/16"
-0083/16"5/16"1/16"
-0097/32"11/32"1/16"
-0101/4"3/8"1/16"
-0115/16"7/16"1/16"
-0123/8"1/2"1/16"
-0137/16"9/16"1/16"
-0141/2"5/8"1/16"
-0159/16"11/16"1/16"
-0165/8"3/4"1/16"
-01711/16"13/16"1/16"
-0183/4"7/8"1/16"
-01913/16"15/16"1/16"
-0207/8"1"1/16"
-02115/16"1-1/16"1/16"
-0221"1-1/8"1/16"
-0231-1/16"1-3/16"1/16"
-0241-1/8"1-1/4"1/16"
-0251-3/16"1-5/16"1/16"
-0261-1/4"1-3/8"1/16"
-0271-5/16"1-7/16"1/16"
-0281-3/8"1-1/2"1/16"
-0291-1/2"1-5/8"1/16"
-0301-5/8"1-3/4"1/16"
-0311-3/4"1-7/8"1/16"
-0321-7/8"2"1/16"
-0332"2-1/8"1/16"
-0342-1/8"2-1/4"1/16"
-0352-1/4"2-3/8"1/16"
-0362-3/8"2-1/2"1/16"
-0372-1/2"2-5/8"1/16"
-0382-5/8"2-3/4"1/16"
-0392-3/4"2-7/8"1/16"
-0402-7/8"3"1/16"
-0413"3-1/8"1/16"
-0423-1/4"3-3/8"1/16"
-0433-1/2"3-5/8"1/16"
-0443-3/4"3-7/8"1/16"
-0454"4-1/8"1/16"
-0464-1/4"4-3/8"1/16"
-0474-1/2"4-5/8"1/16"
-0484-3/4"4-7/8"1/16"
-0495"5-1/8"1/16"
-0505-1/4"5-3/8"1/16"
-1021/16"1/4"3/32"

#IDODCS
-1033/32"9/32"3/32"
-1041/8"5/16"3/32"
-1055/32"11/32"3/32"
-1063/16"3/8"3/32"
-1077/32"13/32"3/32"
-1081/4"7/16"3/32"
-1095/16"1/2"3/32"
-1103/8"9/16"3/32"
-1117/16"5/8"3/32"
-1121/2"11/16"3/32"
-1139/16"3/4"3/32"
-1145/8"13/16"3/32"
-11511/16"7/8"3/32"
-1163/4"15/16"3/32"
-11713/16"1"3/32"
-1187/8"1-1/16"3/32"
-11915/16"1-1/8"3/32"
-1201"1-3/16"3/32"
-1211-1/16"1-1/4"3/32"
-1221-1/8"1-5/16"3/32"
-1231-3/16"1-3/8"3/32"
-1241-1/4"1-7/16"3/32"
-1251-5/16"1-1/2"3/32"
-1261-3/8"1-9/16"3/32"
-1271-7/16"1-5/8"3/32"
-1281-1/2"1-11/16"3/32"
-1291-9/16"1-3/4"3/32"
-1301-5/8"1-13/16"3/32"
-1311-11/16"1-7/8"3/32"
-1321-3/4"1-15/16"3/32"
-1331-13/16"2"3/32"
-1341-7/8"2-1/16"3/32"
-1351-15/16"2-1/8"3/32"
-1362"2-3/16"3/32"
-1372-1/16"2-1/4"3/32"
-1382-1/8"2-5/16"3/32"
-1392-3/16"2-3/8"3/32"
-1402-1/4"2-7/16"3/32"
-1412-5/16"2-1/2"3/32"
-1422-3/8"2-9/16"3/32"
-1432-7/16"2-5/8"3/32"
-1442-1/2"2-11/16"3/32"
-1452-9/16"2-3/4"3/32"
-1462-5/8"2-13/16"3/32"
-1472-11/16"2-7/8"3/32"
-1482-3/4"2-15/16"3/32"
-1492-13/16"3"3/32"
-1502-7/8"3-1/16"3/32"
-1513"3-3/16"3/32"
-1523-1/4"3-7/16"3/32"
-1533-1/2"3-11/16"3/32"
-1543-3/4"3-15/16"3/32"

#IDODCS
-1554"4-3/16"3/32"
-1564-1/4"4-7/16"3/32"
-1574-1/2"4-11/16"3/32"
-1584-3/4"4-15/16"3/32"
-1595"5-3/16"3/32"
-1605-1/4"5-7/16"3/32"
-1615-1/2"5-11/16"3/32"
-1625-3/4"5-15/16"3/32"
-1636"6-3/16"3/32"
-1646-1/4"6-7/16"3/32"
-1656-1/2"6-11/16"3/32"
-1666-3/4"6-15/16"3/32"
-1677"7-3/16"3/32"
-1687-1/4"7-7/16"3/32"
-1697-1/2"7-11/16"3/32"
-1707-3/4"7-15/16"3/32"
-1718"8-3/16"3/32"
-1728-1/4"8-7/16"3/32"
-1738-1/2"8-11/16"3/32"
-1748-3/4"8-15/16"3/32"
-1759"9-3/16"3/32"
-1769-1/4"9-7/16"3/32"
-1779-1/2"9-11/16"3/32"
-1789-3/4"9-15/16"3/32"
-2013/16"7/16"1/8"
-2021/4"1/2"1/8"
-2035/16"9/16"1/8"
-2043/8"5/8"1/8"
-2057/16"11/16"1/8"
-2061/2"3/4"1/8"
-2079/16"13/16"1/8"
-2085/8"7/8"1/8"
-20911/16"15/16"1/8"
-2103/4"1"1/8"
-21113/16"1-1/16"1/8"
-2127/8"1-1/8"1/8"
-21315/16"1-3/16"1/8"
-2141"1-1/4"1/8"
-21511/16"1-5/16"1/8"
-2161-1/8"1-3/8"1/8"
-2171-3/16"1-7/16"1/8"
-2181-1/4"1-1/2"1/8"
-2191-5/16"1-9/16"1/8"
-2201-3/8"1-5/8"1/8"
-2211-7/16"1-11/16"1/8"
-2221-1/2"1-3/4"1/8"
-2231-5/8"1-7/8"1/8"
-2241-3/4"2"1/8"
-2251-7/8"2-1/8"1/8"
-2262"2-1/4"1/8"
-2272-1/8"2-3/8"1/8"
-2282-1/4"2-1/2"1/8"
#IDODCS
-2292-3/8"2-5/8"1/8"
-2302-1/2"2-3/4"1/8"
-2312-5/8"2-7/8"1/8"
-2322-3/4"3"1/8"
-2332-7/8"3-1/8"1/8"
-2343"3-1/4"1/8"
-2353-1/8"3-3/8"1/8"
-2363-1/4"3-1/2"1/8"
-2373-3/8"3-5/8"1/8"
-2383-1/2"3-3/4"1/8"
-2393-5/8"3-7/8"1/8"
-2403-3/4"4"1/8"
-2413-7/8"4-1/8"1/8"
-2424"4-1/4"1/8"
-2434-1/8"4-3/8"1/8"
-2444-1/4"4-1/2"1/8"
-2454-3/8"4-5/8"1/8"
-2464-1/2"4-3/4"1/8"
-2474-5/8"4-7/8"1/8"
-2484-3/7"5"1/8"
-2494-7/8"5-1/8"1/8"
-2505"5-1/4"1/8"
-2515-1/8"5-3/8"1/8"
-2525-1/4"5-1/2"1/8"
-2535-3/8"5-5/8"1/8"
-2545-1/2"5-3/4"1/8"
-2555-5/8"5-7/8"1/8"
-2565-3/4"6"1/8"
-2575-7/8"6-1/8"1/8"
-2586"6-1/4"1/8"
-2596-1/4"6-1/2"1/8"
-2606-1/2"6-3/4"1/8"
-2616-3/4"7"1/8"
-2627"7-1/4"1/8"
-2637-1/4"7-1/2"1/8"
-2647-1/2"7-3/4"1/8"
-2657-3/4"8"1/8"
-2668"8-1/4"1/8"
-2678-1/4"8-1/2"1/8"
-2688-1/2"8-3/4"1/8"
-2698-3/4"9"1/8"
-2709"9-1/4"1/8"
-2719-1/4"9-1/2"1/8"
-2729-1/2"9-3/4"1/8"
-2739-3/4"10"1/8"
-27410"10-1/4"1/8"
-27510-1/2"10-3/4"1/8"
-27611"11-1/4"1/8"
-27711-1/2"11-3/4"1/8"
-27812"12-1/4"1/8"
-27913"13-1/4"1/8"
-28014"14-1/4"1/8"
-28115"15-1/4"1/8"
-28216"16-1/4"1/8"
-28317"17-1/4"1/8"
-28418"18-1/4"1/8"
-3097/16"13/16"3/16"
-3101/2"7/8"3/16"
-3119/16"15/16"3/16"
-3125/8"1"3/16"
-31311/16"1-1/16"3/16"
-3143/4"1-1/8"3/16"
-31513/16"1-3/16"3/16"
-3167/8"1-1/4"3/16"
-31715/16"1-5/16"3/16"

#IDODCS
-3181"1-3/8"3/16"
-3191-1/16"1-7/16"3/16"
-3201-1/8"1-1/2"3/16"
-3211-3/16"1-9/16"3/16"
-3221-1/4"1-5/8"3/16"
-3231-5/16"1-11/16"3/16"
-3241-3/8"1-3/4"3/16"
-3251-1/2"1-7/8"3/16"
-3261-5/8"2"3/16"
-3271-3/4"2-1/8"3/16"
-3281-7/8"2-1/4"3/16"
-3292"2-3/8"3/16"
-3302-1/8"2-1/2"3/16"
-3312-1/4"2-5/8"3/16"
-3322-3/8"2-3/4"3/16"
-3332-1/2"2-7/8"3/16"
-3342-5/8"3"3/16"
-3352-3/4"3-1/8"3/16"
-3362-7/8"3-1/4"3/16"
-3373"3-3/8"3/16"
-3383-1/8"3-1/2"3/16"
-3393-1/4"3-5/8"3/16"
-3403-3/8"3-3/4"3/16"
-3413-1/2"3-7/8"3/16"
-3423-5/8"4"3/16"
-3433-3/4"4-1/8"3/16"
-3443-7/8"4-1/4"3/16"
-3454"4-3/8"3/16"
-3464-1/8"4-1/2"3/16"
-3474-1/4"5-5/8"3/16"
-3484-3/8"4-3/4"3/16"
-3494-1/2"4-7/8"3/16"
-3504-5/8"5"3/16"
-3514-3/4"5-1/8"3/16"
-3524-7/8"5-1/4"3/16"
-3535"5-3/8"3/16"
-3545-1/8"5-1/2"3/16"
-3555-1/4"5-5/8"3/16"
-3565-3/8"5-3/4"3/16"
-3575-1/2"5-7/8"3/16"
-3585-5/8"6"3/16"
-3595-3/4"6-1/8"3/16"
-3605-7/8"6-1/4"3/16"
-3616"6-3/8"3/16"
-3626-1/4"6-5/8"3/16"
-3636-1/2"6-7/8"3/16"
-3646-3/4"7-1/8"3/16"
-3657"7-3/8"3/16"
-3667-1/4"7-5/8"3/16"
-3677-1/2"7-7/8"3/16"
-3687-3/4"8-1/8"3/16"
-3698"8-3/8"3/16"
-3708-1/4"8-5/8"3/16"
-3718-1/2"8-7/8"3/16"
-3728-3/4"9-1/8"3/16"
-3739"9-3/8"3/16"
-3749-1/4"9-5/8"3/16"
-3759-1/2"9-7/8"3/16"
-3769-3/4"10-1/8"3/16"
-37710"10-3/8"3/16"
-37810-1/2"10-7/8"3/16"
-37911"11-3/8"3/16"
-38011-1/2"11-7/8"3/16"
-38112"12-3/8"3/16"
-38213"13-3/8"3/16"

#IDODCS
-38314"14-3/8"3/16"
-38415"15-3/8"3/16"
-38516"16-3/8"3/16"
-38617"17-3/8"3/16"
-38718"18-3/8"3/16"
-38819"19-3/8"3/16"
-38920"20-3/8"3/16"
-39021"21-3/8"3/16"
-39122"22-3/8"3/16"
-39223"23-3/8"3/16"
-39324"24-3/8"3/16"
-39425"25-3/8"3/16"
-39526"26-3/8"3/16"
-4254-1/2"5"1/4"
-4264-5/8"5-1/8"1/4"
-4274-3/4"5-1/4"1/4"
-4284-7/8"5-3/8"1/4"
-4295"5-1/2"1/4"
-4305-1/8"5-5/8"1/4"
-4315-1/4"5-3/4"1/4"
-4325-3/8"5-7/8"1/4"
-4335-1/2"6"1/4"
-4345-5/8"6-1/8"1/4"
-4355-3/4"6-1/4"1/4"
-4365-7/8"6-3/8"1/4"
-4376"6-1/2"1/4"
-4386-1/4"6-3/4"1/4"
-4396-1/2"7"1/4"
-4406-3/4"7-1/4"1/4"
-4417"7-1/2"1/4"
-4427-1/4"7-3/4"1/4"
-4437-1/2"8"1/4"
-4447-3/4"8-1/4"1/4"
-4458"8-1/2"1/4"
-4468-1/2"9"1/4"
-4479"9-1/2"1/4"
-4489-1/2"10"1/4"
-44910"10-1/2"1/4"
-45010-1/2"11"1/4"
-45111"11-1/2"1/4"
-45211-1/2"12"1/4"
-45312"12-1/2"1/4"
-45412-1/2"13"1/4"
-45513"13-1/2"1/4"
-45613-1/2"14"1/4"
-45714"14-1/2"1/4"
-45814-1/2"15"1/4"
-45915"15-1/2"1/4"
-46015-1/2"16"1/4"
-46116"16-1/2"1/4"
-46216-1/2"17"1/4"
-46317"17-1/2"1/4"
-46417-1/2"18"1/4"
-46518"18-1/2"1/4"
-46618-1/2"19"1/4"
-46719"19-1/2"1/4"
-46819-1/2"20"1/4"
-46920"20-1/2"1/4"
-47021"21-1/2"1/4"
-47122"22-1/2"1/4"
-47223"23-1/2"1/4"
-47324"24-1/2"1/4"
-47425"25-1/2"1/4"
-47526"26-1/2"1/4"
    

O-Ring Removal Tools


We also carry in stock O-Ring Removal Tools to help facilitate the removal of O-rings from a variety of applications. Above: ADO-96 O-Ring Removal Tool and ADO-96PICK pick-style tool.

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