O-rings - ISO 3601 Sizes

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ISO 3601 specifies the inside diameters, cross-sections, tolerances and designation codes for O-rings used in fluid power systems for general industrial and aerospace applications.

The dimensions and tolerances specified in this part of ISO 3601 are suitable for any elastomeric material, provided that suitable tooling is available.

NOTE: The tooling most commonly available is based on 70 IRHD NBR shrinkage rates (see ISO 48).

Standard cross-sections of ISO 3601 Metric O-rings

Series	Cross Section (mm)	I.D. Range (mm)
A	1.80 ± 0.08	1.80 ~ 125.00
B	2.65 ± 0.09	4.50 ~ 250.00
C	3.55 ± 0.10	14.00 ~ 355.00
D	5.30 ± 0.13	37.50 ~ 200.00
E	7.00 ± 0.15	109.00 ~ 400.00

ISO 3601 Metric O-ring sizes:

Cross Section (section diameter), d2 = 1.80 ± 0.08 mm

Size code	Size	I.D. (mm)	Tolerance (mm)
A0018	1.8 x 1.8	1.80	± 0.13
A0020	2 x 1.8	2.00	± 0.13
A0022	2.24 x 1.8	2.24	± 0.13
A0025	2.5 x 1.8	2.50	± 0.13
A0028	2.8 x 1.8	2.80	± 0.13
A0032	3.15 x 1.8	3.15	± 0.13
A0036	3.55 x 1.8	3.55	± 0.13
A0038	3.75 x 1.8	3.75	± 0.13
A0040	4 x 1.8	4.00	± 0.13
A0045	4.5 x 1.8	4.50	± 0.13
A0049	4.87 x 1.8	4.87	± 0.13
A0050	5 x 1.8	5.00	± 0.13
A0052	5.15 x 1.8	5.15	± 0.13
A0053	5.3 x 1.8	5.30	± 0.13
A0056	5.6 x 1.8	5.60	± 0.13
A0060	6 x 1.8	6.00	± 0.13
A0063	6.3 x 1.8	6.30	± 0.13
A0067	6.7 x 1.8	6.70	± 0.13
A0069	6.9 x 1.8	6.90	± 0.14
A0071	7.1 x 1.8	7.10	± 0.14
A0075	7.5 x 1.8	7.50	± 0.14
A0080	8 x 1.8	8.00	± 0.14
A0085	8.5 x 1.8	8.50	± 0.15
A0088	8.75 x 1.8	8.75	± 0.15
A0090	9 x 1.8	9.00	± 0.15
A0095	9.5 x 1.8	9.50	± 0.15
A0100	10 x 1.8	10.00	± 0.15
A0106	10.6 x 1.8	10.60	± 0.16
A0112	11.2 x 1.8	11.20	± 0.16
A0118	11.8 x 1.8	11.80	± 0.17
A0125	12.5 x 1.8	12.50	± 0.17
A0132	13.2 x 1.8	13.20	± 0.17
A0140	14 x 1.8	14.00	± 0.18
A0150	15 x 1.8	15.00	± 0.18
A0160	16 x 1.8	16.00	± 0.19
A0170	17 x 1.8	17.00	± 0.20
A0180	18 x 1.8	18.00	± 0.20
A0190	19 x 1.8	19.00	± 0.21
A0200	20 x 1.8	20.00	± 0.21
A0212	21.2 x 1.8	21.20	± 0.22
A0224	22.4 x 1.8	22.40	± 0.23
A0236	23.6 x 1.8	23.60	± 0.24
A0250	25 x 1.8	25.00	± 0.24
A0258	25.8 x 1.8	25.80	± 0.25
A0265	26.5 x 1.8	26.50	± 0.25
A0280	28 x 1.8	28.00	± 0.26
A0300	30 x 1.8	30.00	± 0.26
A0315	31.5 x 1.8	31.50	± 0.28
A0325	32.5 x 1.8	32.50	± 0.29
A0335	33.5 x 1.8	33.50	± 0.29
A0345	34.5 x 1.8	34.50	± 0.30
A0355	35.5 x 1.8	35.50	± 0.31
A0365	36.5 x 1.8	36.50	± 0.31
A0375	37.5 x 1.8	37.50	± 0.32
A0387	38.7 x 1.8	38.70	± 0.32
A0400	40 x 1.8	40.00	± 0.33
A0412	41.2 x 1.8	41.20	± 0.34
A0425	42.5 x 1.8	42.50	± 0.35
A0437	43.7 x 1.8	43.70	± 0.35
A0450	45 x 1.8	45.00	± 0.36
A0475	47.5 x 1.8	47.50	± 0.38
A0500	50 x 1.8	50.00	± 0.39
A0530	53 x 1.8	53.00	± 0.41
A0560	56 x 1.8	56.00	± 0.42
A0600	60 x 1.8	60.00	± 0.45
A0630	63 x 1.8	63.00	± 0.46
A0670	67 x 1.8	67.00	± 0.49
A0710	71 x 1.8	71.00	± 0.51
A0750	75 x 1.8	75.00	± 0.53
A0800	80 x 1.8	80.00	± 0.56
A0850	85 x 1.8	85.00	± 0.59
A0900	90 x 1.8	90.00	± 0.62
A0950	95 x 1.8	95.00	± 0.64
A1000	100 x 1.8	100.00	± 0.67
A1060	106 x 1.8	106.00	± 0.71
A1120	112 x 1.8	112.00	± 0.74
A1180	118 x 1.8	118.00	± 0.77
A1250	125 x 1.8	125.00	± 0.81

Cross Section (section diameter), d2 = 2.65 ± 0.09 mm

Size code	Size	I.D. (mm)	Tolerance (mm)
B0045	4.5 x 2.65	4.50	± 0.13
B0053	5.3 x 2.65	5.30	± 0.13
B0060	6 x 2.65	6.00	± 0.13
B0069	6.9 x 2.65	6.90	± 0.14
B0080	8 x 2.65	8.00	± 0.14
B0090	9 x 2.65	9.00	± 0.15
B0095	9.5 x 2.65	9.50	± 0.15
B0100	10 x 2.65	10.00	± 0.15
B0106	10.6 x 2.65	10.60	± 0.16
B0112	11.2 x 2.65	11.20	± 0.16
B0118	11.8 x 2.65	11.80	± 0.17
B0125	12.5 x 2.65	12.50	± 0.17
B0132	13.2 x 2.65	13.20	± 0.17
B0140	14 x 2.65	14.00	± 0.18
B0150	15 x 2.65	15.00	± 0.18
B0160	16 x 2.65	16.00	± 0.19
B0170	17 x 2.65	17.00	± 0.20
B0180	18 x 2.65	18.00	± 0.20
B0190	19 x 2.65	19.00	± 0.21
B0200	20 x 2.65	20.00	± 0.21
B0212	21.2 x 2.65	21.20	± 0.22
B0224	22.4 x 2.65	22.40	± 0.23
B0236	23.6 x 2.65	23.60	± 0.24
B0250	25 x 2.65	25.00	± 0.24
B0258	25.8 x 2.65	25.80	± 0.25
B0265	26.5 x 2.65	26.50	± 0.25
B0280	28 x 2.65	28.00	± 0.26
B0300	30 x 2.65	30.00	± 0.27
B0315	31.5 x 2.65	31.50	± 0.28
B0325	32.5 x 2.65	32.50	± 0.29
B0335	33.5 x 2.65	33.50	± 0.29
B0345	34.5 x 2.65	34.50	± 0.30
B0355	35.5 x 2.65	35.50	± 0.31
B0365	36.5 x 2.65	36.50	± 0.31
B0375	37.5 x 2.65	37.50	± 0.32
B0387	38.7 x 2.65	38.70	± 0.32
B0400	40 x 2.65	40.00	± 0.33
B0412	41.2 x 2.65	41.20	± 0.34
B0425	42.5 x 2.65	42.50	± 0.35
B0437	43.7 x 2.65	43.70	± 0.35
B0450	45 x 2.65	45.00	± 0.36
B0462	46.2 x 2.65	46.20	± 0.37
B0475	47.5 x 2.65	47.50	± 0.38
B0487	48.7 x 2.65	48.70	± 0.38
B0500	50 x 2.65	50.00	± 0.39
B0515	51.5 x 2.65	51.50	± 0.40
B0530	53 x 2.65	53.00	± 0.41
B0545	54.5 x 2.65	54.50	± 0.42
B0560	56 x 2.65	56.00	± 0.42
B0580	58 x 2.65	58.00	± 0.44
B0600	60 x 2.65	60.00	± 0.45
B0615	61.5 x 2.65	61.50	± 0.45
B0630	63 x 2.65	63.00	± 0.46
B0650	65 x 2.65	65.00	± 0.48
B0670	67 x 2.65	67.00	± 0.49
B0690	69 x 2.65	69.00	± 0.50
B0710	71 x 2.65	71.00	± 0.51
B0730	73 x 2.65	73.00	± 0.52
B0750	75 x 2.65	75.00	± 0.53
B0800	80 x 2.65	80.00	± 0.56
B0850	85 x 2.65	85.00	± 0.59
B0900	90 x 2.65	90.00	± 0.62
B0950	95 x 2.65	95.00	± 0.64
B1000	100 x 2.65	100.00	± 0.67
B1060	106 x 2.65	106.00	± 0.71
B1120	112 x 2.65	112.00	± 0.74
B1180	118 x 2.65	118.00	± 0.77
B1250	125 x 2.65	125.00	± 0.81
B1320	132 x 2.65	132.00	± 0.85
B1400	140 x 2.65	140.00	± 0.89
B1500	150 x 2.65	150.00	± 0.95
B1600	160 x 2.65	160.00	± 1.00
B1700	170 x 2.65	170.00	± 1.06
B1800	180 x 2.65	180.00	± 1.11
B1900	190 x 2.65	190.00	± 1.17
B2000	200 x 2.65	200.00	± 1.22
B2120	212 x 2.65	212.00	± 1.29
B2240	224 x 2.65	224.00	± 1.35
B2300	230 x 2.65	230.00	± 1.39
B2360	236 x 2.65	236.00	± 1.42
B2430	243 x 2.65	243.00	± 1.46
B2500	250 x 2.65	250.00	± 1.49

Cross Section (section diameter), d2 = 3.55 ± 0.10 mm

Size code	Size	I.D. (mm)	Tolerance (mm)
C0140	14 x 3.55	14.00	± 0.18
C0150	15 x 3.55	15.00	± 0.18
C0160	16 x 3.55	16.00	± 0.19
C0170	17 x 3.55	17.00	± 0.20
C0180	18 x 3.55	18.00	± 0.20
C0190	19 x 3.55	19.00	± 0.21
C0200	20 x 3.55	20.00	± 0.21
C0212	21.2 x 3.55	21.20	± 0.22
C0224	22.4 x 3.55	22.40	± 0.23
C0236	23.6 x 3.55	23.60	± 0.24
C0250	25 x 3.55	25.00	± 0.24
C0258	25.8 x 3.55	25.80	± 0.25
C0265	26.5 x 3.55	26.50	± 0.25
C0280	28 x 3.55	28.00	± 0.26
C0300	30 x 3.55	30.00	± 0.27
C0315	31.5 x 3.55	31.50	± 0.28
C0325	32.5 x 3.55	32.50	± 0.29
C0335	33.5 x 3.55	33.50	± 0.29
C0345	34.5 x 3.55	34.50	± 0.30
C0355	35.5 x 3.55	35.50	± 0.31
C0365	36.5 x 3.55	36.50	± 0.31
C0375	37.5 x 3.55	37.50	± 0.32
C0387	38.7 x 3.55	38.70	± 0.32
C0400	40 x 3.55	40.00	± 0.33
C0412	41.2 x 3.55	41.20	± 0.34
C0425	42.5 x 3.55	42.50	± 0.35
C0437	43.7 x 3.55	43.70	± 0.35
C0450	45 x 3.55	45.00	± 0.36
C0462	46.2 x 3.55	46.20	± 0.37
C0475	47.5 x 3.55	47.50	± 0.38
C0487	48.7 x 3.55	48.70	± 0.38
C0500	50 x 3.55	50.00	± 0.39
C0515	51.5 x 3.55	51.50	± 0.40
C0530	53 x 3.55	53.00	± 0.41
C0545	54.5 x 3.55	54.50	± 0.42
C0560	56 x 3.55	56.00	± 0.42
C0580	58 x 3.55	58.00	± 0.44
C0600	60 x 3.55	60.00	± 0.45
C0615	61.5 x 3.55	61.50	± 0.45
C0630	63 x 3.55	63.00	± 0.46
C0650	65 x 3.55	65.00	± 0.48
C0670	67 x 3.55	67.00	± 0.49
C0690	69 x 3.55	69.00	± 0.50
C0710	71 x 3.55	71.00	± 0.51
C0730	73 x 3.55	73.00	± 0.52
C0750	75 x 3.55	75.00	± 0.53
C0775	77.5 x 3.55	77.50	± 0.55
C0800	80 x 3.55	80.00	± 0.56
C0825	82.5 x 3.55	82.50	± 0.57
C0850	85 x 3.55	85.00	± 0.59
C0875	87.5 x 3.55	87.50	± 0.60
C0900	90 x 3.55	90.00	± 0.62
C0925	92.5 x 3.55	92.50	± 0.63
C0950	95 x 3.55	95.00	± 0.64
C0975	97.5 x 3.55	97.50	± 0.66
C1000	100 x 3.55	100.00	± 0.67
C1030	103 x 3.55	103.00	± 0.69
C1060	106 x 3.55	106.00	± 0.71
C1090	109 x 3.55	109.00	± 0.72
C1120	112 x 3.55	112.00	± 0.74
C1150	115 x 3.55	115.00	± 0.76
C1180	118 x 3.55	118.00	± 0.77
C1220	122 x 3.55	122.00	± 0.80
C1250	125 x 3.55	125.00	± 0.81
C1280	128 x 3.55	128.00	± 0.83
C1320	132 x 3.55	132.00	± 0.85
C1360	136 x 3.55	136.00	± 0.87
C1400	140 x 3.55	140.00	± 0.89
C1450	145 x 3.55	145.00	± 0.92
C1500	150 x 3.55	150.00	± 0.95
C1550	155 x 3.55	155.00	± 0.98
C1600	160 x 3.55	160.00	± 1.00
C1650	165 x 3.55	165.00	± 1.03
C1700	170 x 3.55	170.00	± 1.06
C1750	175 x 3.55	175.00	± 1.09
C1800	180 x 3.55	180.00	± 1.11
C1850	185 x 3.55	185.00	± 1.14
C1900	190 x 3.55	190.00	± 1.17
C1950	195 x 3.55	195.00	± 1.20
C2000	200 x 3.55	200.00	± 1.22
C2120	212 x 3.55	212.00	± 1.29
C2180	218 x 3.55	218.00	± 1.32
C2240	224 x 3.55	224.00	± 1.35
C2300	230 x 3.55	230.00	± 1.39
C2360	236 x 3.55	236.00	± 1.42
C2500	250 x 3.55	250.00	± 1.49
C2580	258 x 3.55	258.00	± 1.54
C2650	265 x 3.55	265.00	± 1.57
C2800	280 x 3.55	280.00	± 1.65
C2900	290 x 3.55	290.00	± 1.71
C3000	300 x 3.55	300.00	± 1.76
C3070	307 x 3.55	307.00	± 1.80
C3150	315 x 3.55	315.00	± 1.84
C3350	335 x 3.55	335.00	± 1.95
C3550	355 x 3.55	355.00	± 2.06

Cross Section (section diameter), d2 = 5.30 ± 0.13 mm

Size code	Size	I.D. (mm)	Tolerance (mm)
D0375	37.5 x 5.3	37.50	± 0.32
D0387	38.7 x 5.3	38.70	± 0.32
D0400	40 x 5.3	40.00	± 0.33
D0412	41.2 x 5.3	41.20	± 0.34
D0425	42.5 x 5.3	42.50	± 0.35
D0437	43.7 x 5.3	43.70	± 0.35
D0450	45 x 5.3	45.00	± 0.36
D0462	46.2 x 5.3	46.20	± 0.37
D0475	47.5 x 5.3	47.50	± 0.38
D0487	48.7 x 5.3	48.70	± 0.38
D0500	50 x 5.3	50.00	± 0.39
D0515	51.5 x 5.3	51.50	± 0.40
D0530	53 x 5.3	53.00	± 0.41
D0545	54.5 x 5.3	54.50	± 0.42
D0560	56 x 5.3	56.00	± 0.42
D0580	58 x 5.3	58.00	± 0.44
D0600	60 x 5.3	60.00	± 0.45
D0615	61.5 x 5.3	61.50	± 0.45
D0630	63 x 5.3	63.00	± 0.46
D0650	65 x 5.3	65.00	± 0.48
D0670	67 x 5.3	67.00	± 0.49
D0690	69 x 5.3	69.00	± 0.50
D0710	71 x 5.3	71.00	± 0.51
D0730	73 x 5.3	73.00	± 0.52
D0750	75 x 5.3	75.00	± 0.53
D0775	77.5 x 5.3	77.50	± 0.55
D0800	80 x 5.3	80.00	± 0.56
D0825	82.5 x 5.3	82.50	± 0.57
D0850	85 x 5.3	85.00	± 0.59
D0875	87.5 x 5.3	87.50	± 0.60
D0900	90 x 5.3	90.00	± 0.62
D0925	92.5 x 5.3	92.50	± 0.63
D0950	95 x 5.3	95.00	± 0.64
D0975	97.5 x 5.3	97.50	± 0.66
D1000	100 x 5.3	100.00	± 0.67
D1030	103 x 5.3	103.00	± 0.69
D1060	106 x 5.3	106.00	± 0.71
D1090	109 x 5.3	109.00	± 0.72
D1120	112 x 5.3	112.00	± 0.74
D1150	115 x 5.3	115.00	± 0.76
D1180	118 x 5.3	118.00	± 0.77
D1220	122 x 5.3	122.00	± 0.80
D1250	125 x 5.3	125.00	± 0.81
D1280	128 x 5.3	128.00	± 0.83
D1320	132 x 5.3	132.00	± 0.85
D1360	136 x 5.3	136.00	± 0.87
D1400	140 x 5.3	140.00	± 0.89
D1450	145 x 5.3	145.00	± 0.92
D1500	150 x 5.3	150.00	± 0.95
D1550	155 x 5.3	155.00	± 0.98
D1600	160 x 5.3	160.00	± 1.00
D1650	165 x 5.3	165.00	± 1.03
D1700	170 x 5.3	170.00	± 1.06
D1750	175 x 5.3	175.00	± 1.09
D1800	180 x 5.3	180.00	± 1.11
D1850	185 x 5.3	185.00	± 1.14
D1900	190 x 5.3	190.00	± 1.17
D1950	195 x 5.3	195.00	± 1.20
D2000	200 x 5.3	200.00	± 1.22

Cross Section (section diameter), d2 = 7.00 ± 0.15 mm

Size code	Size	I.D. (mm)	Tolerance (mm)
E1090	109 x 7	109.00	± 0.72
E1120	112 x 7	112.00	± 0.74
E1150	115 x 7	115.00	± 0.76
E1180	118 x 7	118.00	± 0.77
E1220	122 x 7	122.00	± 0.80
E1250	125 x 7	125.00	± 0.81
E1280	128 x 7	128.00	± 0.83
E1320	132 x 7	132.00	± 0.85
E1360	136 x 7	136.00	± 0.87
E1400	140 x 7	140.00	± 0.89
E1450	145 x 7	145.00	± 0.92
E1500	150 x 7	150.00	± 0.95
E1550	155 x 7	155.00	± 0.98
E1600	160 x 7	160.00	± 1.00
E1650	165 x 7	165.00	± 1.03
E1700	170 x 7	170.00	± 1.06
E1750	175 x 7	175.00	± 1.09
E1800	180 x 7	180.00	± 1.11
E1850	185 x 7	185.00	± 1.14
E1900	190 x 7	190.00	± 1.17
E1950	195 x 7	195.00	± 1.20
E2000	200 x 7	200.00	± 1.22
E2060	206 x 7	206.00	± 1.26
E2120	212 x 7	212.00	± 1.29
E2180	218 x 7	218.00	± 1.32
E2240	224 x 7	224.00	± 1.35
E2300	230 x 7	230.00	± 1.39
E2360	236 x 7	236.00	± 1.42
E2430	243 x 7	243.00	± 1.46
E2500	250 x 7	250.00	± 1.49
E2580	258 x 7	258.00	± 1.54
E2650	265 x 7	265.00	± 1.57
E2720	272 x 7	272.00	± 1.61
E2800	280 x 7	280.00	± 1.65
E2900	290 x 7	290.00	± 1.71
E3000	300 x 7	300.00	± 1.76
E3070	307 x 7	307.00	± 1.80
E3150	315 x 7	315.00	± 1.84
E3250	325 x 7	325.00	± 1.90
E3350	335 x 7	335.00	± 1.95
E3450	345 x 7	345.00	± 2.00
E3550	355 x 7	355.00	± 2.06
E3650	365 x 7	365.00	± 2.11
E3750	375 x 7	375.00	± 2.16
E3870	387 x 7	387.00	± 2.23
E4000	400 x 7	400.00	± 2.29

Rotary Shaft Seals

Hydraulic Seals

Pneumatic Seals

O-rings