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O-Ring Size Standard

NF T 47-501 French Metric O-Ring Sizes & Tolerances

NF T 47-501 is the French national standard for metric O-rings, closely aligned with ISO 3601-1. It defines inside diameters, cross-sections and dimensional tolerances across two precision classes — aerospace (tight) and general industrial — plus visual inspection acceptance classes for surface and molding defects. Engineers use it to spec a size, precision class and inspection level with confidence; ARC molds every NF T 47-501 size to your compound, hardness and class.

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Using the NF T 47-501 chart to spec your metric O-ring

NF T 47-501 is the French national standard for metric O-rings, closely aligned with ISO 3601-1. Engineers and buyers reach for this chart when a print calls out an NF T 47-501 size or when they need to cross-reference a French metric O-ring to an ISO 3601 equivalent. Read across the table to pin down the inside diameter and cross-section, then choose your precision class — aerospace-tight or general industrial — and the visual inspection acceptance class that governs allowable surface and molding defects. That combination of size, precision class and inspection grade is what fully defines the part you need to source.

ARC molds every NF T 47-501 size to your specification — you pick the compound and hardness, we match the precision and inspection class your application demands. As a US custom manufacturer certified to ISO 9001:2015 and IATF 16949:2016, we support a wide range of elastomers for temperature, chemical and pressure requirements. Send your size or drawing and our engineers return a material recommendation and quote, usually within one business day.

NF T 47-501 Metric O-Rings

NFT 47-501 is issued by the Association Française de Normalisation (French Standards Institute). It is very similar to ISO 3601-1 in both the sizes included and the size reference. The size reference codes are designated with a letter corresponding to each of 5 cross section groups (A-E), 4 digits indicating ID (rounded to 0.1 mm), a 2nd letter indicating Precision Class and a 3rd letter indicating Visual (inspection) Class. The Precision Class is indicated by the letter A (for Aerospace applications) or G (for General Purpose applications). The visual classes are N (1.0 AQL) and S (.65 AQL).
For a complete listing of all metric o-ring sizes, visit our Metric O-Ring Cross Reference Table.

NF T 47-501 Size Chart

Global Part#ReferenceC/S (MM)I.D. (MM)C/S (Inch)I.D. (Inch)
1.80X001.8A00181.81.80.0710.071
1.80X002A00201.820.0710.079
1.80X002.24A00221.82.240.0710.088
1.80X002.5A00251.82.50.0710.098
1.80X002.8A00281.82.80.0710.11
1.80X003.15A00321.83.150.0710.124
1.80X003.55A00361.83.550.0710.14
1.80X003.75A00381.83.750.0710.148
1.80X004A00401.840.0710.157
1.80X004.5A00451.84.50.0710.177
1.80X004.75A00481.84.750.0710.187
1.80X004.87A00491.84.870.0710.192
1.80X005A00501.850.0710.197
1.80X005.15A00521.85.150.0710.203
1.80X005.3A00531.85.30.0710.209
1.80X005.6A00561.85.60.0710.22
1.80X006A00601.860.0710.236
1.80X006.3A00631.86.30.0710.248
1.80X006.7A00671.86.70.0710.264
1.80X006.9A00691.86.90.0710.272
1.80X007.1A00711.87.10.0710.28
1.80X007.5A00751.87.50.0710.295
1.80X008A00801.880.0710.315
1.80X008.5A00851.88.50.0710.335
1.80X008.75A00881.88.750.0710.344
1.80X009A00901.890.0710.354
1.80X009.5A00951.89.50.0710.374
1.80X010A01001.8100.0710.394
1.80X010.6A01061.810.60.0710.417
1.80X011.2A01121.811.20.0710.441
1.80X011.6A01161.811.60.0710.457
1.80X011.8A01181.811.80.0710.465
1.80X012.1A01211.812.10.0710.476
1.80X012.5A01251.812.50.0710.492
1.80X012.8A01281.812.80.0710.504
1.80X013.2A01321.813.20.0710.52
1.80X014A01401.8140.0710.551
1.80X014.5A01451.814.50.0710.571
1.80X015A01501.8150.0710.591
1.80X015.5A01551.815.50.0710.61
1.80X016A01601.8160.0710.63
1.80X017A01701.8170.0710.669
1.80X018A01801.8180.0710.709
1.80X019A01901.8190.0710.748
1.80X020A02001.8200.0710.787
1.80X020.6A02061.820.60.0710.811
1.80X021.2A02121.821.20.0710.835
1.80X022.4A02241.822.40.0710.882
1.80X023.6A02361.823.60.0710.929
1.80X024.3A02431.824.30.0710.957
1.80X025A02501.8250.0710.984
1.80X025.8A02581.825.80.0711.016
1.80X026.5A02651.826.50.0711.043
1.80X027.3A02731.827.30.0711.075
1.80X028A02801.8280.0711.102
1.80X030A03001.8300.0711.181
1.80X031.5A03151.831.50.0711.24
1.80X032.5A03251.832.50.0711.28
1.80X033.5A03351.833.50.0711.319
1.80X034.5A03451.834.50.0711.358
1.80X035.5A03551.835.50.0711.398
1.80X036.5A03651.836.50.0711.437
1.80X037.5A03751.837.50.0711.476
1.80X038.7A03871.838.70.0711.524
1.80X040A04001.8400.0711.575
1.80X041.2A04121.841.20.0711.622
1.80X042.5A04251.842.50.0711.673
1.80X043.7A04371.843.70.0711.72
1.80X045A04501.8450.0711.772
1.80X046.2A04621.846.20.0711.819
1.80X047.5A04751.847.50.0711.87
1.80X048.7A04871.848.70.0711.917
1.80X050A05001.8500.0711.969
2.65X009B00902.6590.1040.354
2.65X009.5B00952.659.50.1040.374
2.65X010B01002.65100.1040.394
2.65X010.6B01062.6510.60.1040.417
2.65X011.2B01122.6511.20.1040.441
2.65X011.6B01162.6511.60.1040.457
2.65X011.8B01182.6511.80.1040.465
2.65X012.1B01212.6512.10.1040.476
2.65X012.5B01252.6512.50.1040.492
2.65X012.8B01282.6512.80.1040.504
2.65X013.2B01322.6513.20.1040.52
2.65X014B01402.65140.1040.551
2.65X014.5B01452.6514.50.1040.571
2.65X015B01502.65150.1040.591
2.65X016B01602.65160.1040.63
2.65X017B01702.65170.1040.669
2.65X018B01802.65180.1040.709
2.65X019B01902.65190.1040.748
2.65X020B02002.65200.1040.787
2.65X020.6B02062.6520.60.1040.811
2.65X021.2B02122.6521.20.1040.835
2.65X022.4B02242.6522.40.1040.882
2.65X023.6B02362.6523.60.1040.929
2.65X024.3B02432.6524.30.1040.957
2.65X025B02502.65250.1040.984
2.65X025.8B02582.6525.80.1041.016
2.65X026.5B02652.6526.50.1041.043
2.65X027.3B02732.6527.30.1041.075
2.65X028B02802.65280.1041.102
2.65X030B03002.65300.1041.181
2.65X031.5B03152.6531.50.1041.24
2.65X032.5B03252.6532.50.1041.28
2.65X033.5B03352.6533.50.1041.319
2.65X034.5B03452.6534.50.1041.358
2.65X035.5B03552.6535.50.1041.398
2.65X036.5B03652.6536.50.1041.437
2.65X037.5B03752.6537.50.1041.476
2.65X038.7B03872.6538.70.1041.524
2.65X040B04002.65400.1041.575
2.65X041.2B04122.6541.20.1041.622
2.65X042.5B04252.6542.50.1041.673
2.65X043.7B04372.6543.70.1041.72
2.65X045B04502.65450.1041.772
2.65X046.2B04622.6546.20.1041.819
2.65X047.5B04752.6547.50.1041.87
2.65X048.7B04872.6548.70.1041.917
2.65X050B05002.65500.1041.969
2.65X051.5B05152.6551.50.1042.028
2.65X053B05302.65530.1042.087
2.65X054.5B05452.6554.50.1042.146
2.65X056B05602.65560.1042.205
2.65X058B05802.65580.1042.283
2.65X060B06002.65600.1042.362
2.65X061.5B06152.6561.50.1042.421
2.65X063B06302.65630.1042.48
2.65X065B06502.65650.1042.559
2.65X067B06702.65670.1042.638
2.65X069B06902.65690.1042.717
2.65X071B07102.65710.1042.795
2.65X073B07302.65730.1042.874
2.65X075B07502.65750.1042.953
2.65X077.5B07752.6577.50.1043.051
2.65X080B08002.65800.1043.15
2.65X082.5B08252.6582.50.1043.248
2.65X085B08502.65850.1043.346
2.65X087.5B08752.6587.50.1043.445
2.65X090B09002.65900.1043.543
2.65X092.5B09252.6592.50.1043.642
2.65X095B09502.65950.1043.74
2.65X097.5B09752.6597.50.1043.839
2.65X100B10002.651000.1043.937
3.55X014C01403.55140.140.551
3.55X014.5C01453.5514.50.140.571
3.55X015C01503.55150.140.591
3.55X015.5C01553.5515.50.140.61
3.55X016C01603.55160.140.63
3.55X017C01703.55170.140.669
3.55X018C01803.55180.140.709
3.55X019C01903.55190.140.748
3.55X040C04003.55400.141.575
3.55X041.2C04123.5541.20.141.622
3.55X042.5C04253.5542.50.141.673
3.55X043.7C04373.5543.70.141.72
3.55X045C04503.55450.141.772
3.55X046.2C04623.5546.20.141.819
3.55X047.5C04753.5547.50.141.87
3.55X048.7C04873.5548.70.141.917
3.55X060C06003.55600.142.362
3.55X061.5C06153.5561.50.142.421
3.55X063C06303.55630.142.48
3.55X065C06503.55650.142.559
3.55X067C06703.55670.142.638
3.55X069C06903.55690.142.717
3.55X071C07103.55710.142.795
3.55X073C07303.55730.142.874
3.55X075C07503.55750.142.953
3.55X077.5C07753.5577.50.143.051
3.55X080C08003.55800.143.15
3.55X082.5C08253.5582.50.143.248
3.55X085C08503.55850.143.346
3.55X087.5C08753.5587.50.143.445
3.55X090C09003.55900.143.543
3.55X092.5C09253.5592.50.143.642
3.55X095C09503.55950.143.74
3.55X097.5C09753.5597.50.143.839
3.55X100C10003.551000.143.937
3.55X103C10303.551030.144.055
3.55X106C10603.551060.144.173
3.55X109C10903.551090.144.291
3.55X112C11203.551120.144.409
3.55X115C11503.551150.144.528
3.55X118C11803.551180.144.646
3.55X122C12203.551220.144.803
3.55X125C12503.551250.144.921
3.55X128C12803.551280.145.039
3.55X132C13203.551320.145.197
3.55X136C13603.551360.145.354
3.55X140C14003.551400.145.512
3.55X145C14503.551450.145.709
3.55X150C15003.551500.145.906
3.55X155C15503.551550.146.102
3.55X160C16003.551600.146.299
3.55X165C16503.551650.146.496
3.55X170C17003.551700.146.693
3.55X175C17503.551750.146.89
3.55X180C18003.551800.147.087
3.55X185C18503.551850.147.283
3.55X190C19003.551900.147.48
3.55X195C19503.551950.147.677
3.55X200C20003.552000.147.874
3.55X020CO2003.55200.140.787
3.55X020.6CO2063.5520.60.140.811
3.55X021.2CO2123.5521.20.140.835
3.55X022.4CO2243.5522.40.140.882
3.55X023.6CO2363.5523.60.140.929
3.55X024.3CO2433.5524.30.140.957
3.55X025CO2503.55250.140.984
3.55X025.8CO2583.5525.80.141.016
3.55X026.5CO2653.5526.50.141.043
3.55X027.3CO2733.5527.30.141.075
3.55X028CO2803.55280.141.102
3.55X030CO3003.55300.141.181
3.55X031.5CO3153.5531.50.141.24
3.55X032.5CO3253.5532.50.141.28
3.55X033.5CO3353.5533.50.141.319
3.55X034.5CO3453.5534.50.141.358
3.55X035.5CO3553.5535.50.141.398
3.55X036.5CO3653.5536.50.141.437
3.55X037.5CO3753.5537.50.141.476
3.55X038.7CO3873.5538.70.141.524
3.55X050CO5003.55500.141.969
3.55X051.5CO5153.5551.50.142.028
3.55X053CO5303.55530.142.087
3.55X054.5CO5453.5554.50.142.146
3.55X056CO5603.55560.142.205
3.55X058CO5803.55580.142.283
5.30X037.5D03755.337.50.2091.476
5.30X038.7D03875.338.70.2091.524
5.30X040D04005.3400.2091.575
5.30X041.2D04125.341.20.2091.622
5.30X042.5D04255.342.50.2091.673
5.30X043.7D04375.343.70.2091.72
5.30X045D04505.3450.2091.772
5.30X046.2D04625.346.20.2091.819
5.30X047.5D04755.347.50.2091.87
5.30X048.7D04875.348.70.2091.917
5.30X050D05005.3500.2091.969
5.30X051.5D05155.351.50.2092.028
5.30X053D05305.3530.2092.087
5.30X054.5D05455.354.50.2092.146
5.30X056D05605.3560.2092.205
5.30X058D05805.3580.2092.283
5.30X060D06005.3600.2092.362
5.30X061.5D06155.361.50.2092.421
5.30X063D06305.3630.2092.48
5.30X065D06505.3650.2092.559
5.30X067D06705.3670.2092.638
5.30X069D06905.3690.2092.717
5.30X071D07105.3710.2092.795
5.30X073D07305.3730.2092.874
5.30X075D07505.3750.2092.953
5.30X077.5D07755.377.50.2093.051
5.30X080D08005.3800.2093.15
5.30X082.5D08255.382.50.2093.248
5.30X085D08505.3850.2093.346
5.30X087.5D08755.387.50.2093.445
5.30X090D09005.3900.2093.543
5.30X092.5D09255.392.50.2093.642
5.30X095D09505.3950.2093.74
5.30X097.5D09755.397.50.2093.839
5.30X100D10005.31000.2093.937
5.30X103D10305.31030.2094.055
5.30X106D10605.31060.2094.173
5.30X109D10905.31090.2094.291
5.30X112D11205.31120.2094.409
5.30X115D11505.31150.2094.528
5.30X118D11805.31180.2094.646
5.30X122D12205.31220.2094.803
5.30X125D12505.31250.2094.921
5.30X128D12805.31280.2095.039
5.30X132D13205.31320.2095.197
5.30X136D13605.31360.2095.354
5.30X140D14005.31400.2095.512
5.30X145D14505.31450.2095.709
5.30X150D15005.31500.2095.906
5.30X155D15505.31550.2096.102
5.30X160D16005.31600.2096.299
5.30X165D16505.31650.2096.496
5.30X170D17005.31700.2096.693
5.30X172.5D17255.3172.50.2096.791
5.30X175D17505.31750.2096.89
5.30X177.5D17755.3177.50.2096.988
5.30X180D18005.31800.2097.087
5.30X182.5D18255.3182.50.2097.185
5.30X185D18505.31850.2097.283
5.30X187.5D18755.3187.50.2097.382
5.30X190D19005.31900.2097.48
5.30X195D19505.31950.2097.677
5.30X200D20005.32000.2097.874
5.30X203D20305.32030.2097.992
5.30X206D20605.32060.2098.11
5.30X212D21205.32120.2098.346
5.30X218D21805.32180.2098.583
5.30X224D22405.32240.2098.819
5.30X230D23005.32300.2099.055
5.30X236D23605.32360.2099.291
5.30X239D23905.32390.2099.409
5.30X243D24305.32430.2099.567
5.30X250D25005.32500.2099.843
5.30X254D25405.32540.20910
5.30X258D25805.32580.20910.157
5.30X261D26105.32610.20910.276
5.30X265D26505.32650.20910.433
5.30X268D26805.32680.20910.551
5.30X272D27205.32720.20910.709
5.30X276D27605.32760.20910.866
5.30X280D28005.32800.20911.024
5.30X283D28305.32830.20911.142
5.30X286D28605.32860.20911.26
5.30X290D29005.32900.20911.417
5.30X295D29505.32950.20911.614
5.30X300D30005.33000.20911.811
5.30X303D30305.33030.20911.929
5.30X307D30705.33070.20912.087
5.30X311D31105.33110.20912.244
5.30X315D31505.33150.20912.402
5.30X320D32005.33200.20912.598
5.30X325D32505.33250.20912.795
5.30X330D33005.33300.20912.992
5.30X335D33505.33350.20913.189
5.30X340D34005.33400.20913.386
5.30X345D34505.33450.20913.583
5.30X350D35005.33500.20913.78
5.30X355D35505.33550.20913.976
5.30X360D36005.33600.20914.173
5.30X365D36505.33650.20914.37
5.30X370D37005.33700.20914.567
5.30X375D37505.33750.20914.764
5.30X379D37905.33790.20914.921
5.30X383D38305.33830.20915.079
5.30X387D38705.33870.20915.236
5.30X391D39105.33910.20915.394
5.30X395D39505.33950.20915.551
5.30X400D40005.34000.20915.748
7.00X109E109071090.2764.291
7.00X112E112071120.2764.409
7.00X115E115071150.2764.528
7.00X118E118071180.2764.646
7.00X122E122071220.2764.803
7.00X125E125071250.2764.921
7.00X128E128071280.2765.039
7.00X132E132071320.2765.197
7.00X136E136071360.2765.354
7.00X140E140071400.2765.512
7.00X145E145071450.2765.709
7.00X150E150071500.2765.906
7.00X155E155071550.2766.102
7.00X160E160071600.2766.299
7.00X165E165071650.2766.496
7.00X170E170071700.2766.693
7.00X172.5E17257172.50.2766.791
7.00X175E175071750.2766.89
7.00X177.5E17757177.50.2766.988
7.00X180E180071800.2767.087
7.00X182.5E18257182.50.2767.185
7.00X185E185071850.2767.283
7.00X185.7E18757185.70.2767.311
7.00X190E190071900.2767.48
7.00X195E195071950.2767.677
7.00X200E200072000.2767.874
7.00X203E203072030.2767.992
7.00X206E206072060.2768.11
7.00X212E212072120.2768.346
7.00X218E218072180.2768.583
7.00X224E224072240.2768.819
7.00X230E230072300.2769.055
7.00X236E236072360.2769.291
7.00X239E239072390.2769.409
7.00X243E243072430.2769.567
7.00X250E250072500.2769.843
7.00X254E254072540.27610
7.00X258E258072580.27610.157
7.00X261E261072610.27610.276
7.00X265E265072650.27610.433
7.00X268E268072680.27610.551
7.00X272E272072720.27610.709
7.00X276E276072760.27610.866
7.00X280E280072800.27611.024
7.00X283E283072830.27611.142
7.00X286E286072860.27611.26
7.00X290E290072900.27611.417
7.00X295E295072950.27611.614
7.00X300E300073000.27611.811
7.00X303E303073030.27611.929
7.00X307E307073070.27612.087
7.00X311E311073110.27612.244
7.00X315E315073150.27612.402
7.00X320E320073200.27612.598
7.00X325E325073250.27612.795
7.00X330E330073300.27612.992
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