ISO 3601 Metric O-Rings

ISO 3601

Global O-Ring and Seal is fully compliant to the dimension and tolerance standards spelled out in ISO 3601-1 Class A for all standard series O-rings and Class B for all metric series O-rings. Subsequently, Global O-Ring and Seal defines the quality acceptance criteria of all O-rings to be in accordance with ISO 3601-3 Grade N which classifies surface imperfections and specifies maximum acceptable limits for these imperfections. This information can be viewed in PDF format here. Stricter tolerance and inspection requirements can be achieved upon customer request.

ISO 3601-1: Dimensional Tolerances

ISO 3601-3: Quality Acceptance Criteria

ISO 3601-3 was originally developed for general-purpose O-rings, but over the years this standard has been revised and refined to include three grades (N, S, CS) of defects depending upon the application.

Grade N: The standard of acceptance for general-purpose O-rings.
Grade S: Quality requirements for optimum performance industrial applications and aerospace applications.
Grade CS: Special and critical sealing applications, such as certain aerospace applications and critical oxygen service applications.

Examples of surface imperfections characterized by this standard include flash, offset, parting-line projection, back rind, excessive trimming, flow marks, non-fills, and indentations.

ISO 3601 Metric O-Rings Size Chart

Issued by the International Organization for Standardization, the ISO 3601 standard contains two groups of O-Rings, Class A and Class B. Class A corresponds to the American standard AS 568B in its current format (the 900 series tube fitting O-Rings are not included). The ISO 3601-1 Size Code for these O-Rings is the same as the AS 568 dash number. Class B allows production of O-Rings in technically acceptable and economical “metric” sizes, which can then fit into metric grooves. The first digit of the Size Code indicates the cross section group (A-E), while the last four digits indicate the O-Ring inside diameter rounded to one-tenth millimeter.

For a complete listing of all metric o-ring sizes, visit our Metric O-Ring Cross Reference Table.

Global Part#	Reference	C/S (MM)	I.D. (MM)	C/S (Inch)	I.D. (Inch)
1.80X001.8	A0018	1.8	1.8	0.071	0.071
1.80X002	A0020	1.8	2	0.071	0.079
1.80X002.24	A0022	1.8	2.24	0.071	0.088
1.80X002.5	A0025	1.8	2.5	0.071	0.098
1.80X002.8	A0028	1.8	2.8	0.071	0.11
1.80X003.15	A0032	1.8	3.15	0.071	0.124
1.80X003.55	A0036	1.8	3.55	0.071	0.14
1.80X003.75	A0038	1.8	3.75	0.071	0.148
1.80X004	A0040	1.8	4	0.071	0.157
1.80X004.5	A0045	1.8	4.5	0.071	0.177
1.80X004.87	A0049	1.8	4.87	0.071	0.192
1.80X005	A0050	1.8	5	0.071	0.197
1.80X005.15	A0052	1.8	5.15	0.071	0.203
1.80X005.3	A0053	1.8	5.3	0.071	0.209
1.80X005.6	A0056	1.8	5.6	0.071	0.22
1.80X006	A0060	1.8	6	0.071	0.236
1.80X006.3	A0063	1.8	6.3	0.071	0.248
1.80X006.7	A0067	1.8	6.7	0.071	0.264
1.80X006.9	A0069	1.8	6.9	0.071	0.272
1.80X007.1	A0071	1.8	7.1	0.071	0.28
1.80X007.5	A0075	1.8	7.5	0.071	0.295
1.80X008	A0080	1.8	8	0.071	0.315
1.80X008.5	A0085	1.8	8.5	0.071	0.335
1.80X008.75	A0088	1.8	8.75	0.071	0.344
1.80X009	A0090	1.8	9	0.071	0.354
1.80X009.5	A0095	1.8	9.5	0.071	0.374
1.80X010	A0100	1.8	10	0.071	0.394
1.80X010.6	A0106	1.8	10.6	0.071	0.417
1.80X011.2	A0112	1.8	11.2	0.071	0.441
1.80X011.8	A0118	1.8	11.8	0.071	0.465
1.80X012.5	A0125	1.8	12.5	0.071	0.492
1.80X013.2	A0132	1.8	13.2	0.071	0.52
1.80X014	A0140	1.8	14	0.071	0.551
1.80X015	A0150	1.8	15	0.071	0.591
1.80X016	A0160	1.8	16	0.071	0.63
1.80X017	A0170	1.8	17	0.071	0.669
1.80X018	A0180	1.8	18	0.071	0.709
1.80X019	A0190	1.8	19	0.071	0.748
1.80X020	A0200	1.8	20	0.071	0.787
1.80X021.2	A0212	1.8	21.2	0.071	0.835
1.80X022.4	A0224	1.8	22.4	0.071	0.882
1.80X023.6	A0236	1.8	23.6	0.071	0.929
1.80X025	A0250	1.8	25	0.071	0.984
1.80X025.8	A0258	1.8	25.8	0.071	1.016
1.80X026.5	A0265	1.8	26.5	0.071	1.043
1.80X028	A0280	1.8	28	0.071	1.102
1.80X030	A0300	1.8	30	0.071	1.181
1.80X031.5	A0315	1.8	31.5	0.071	1.24
1.80X032.5	A0325	1.8	32.5	0.071	1.28
1.80X033.5	A0335	1.8	33.5	0.071	1.319
1.80X034.5	A0345	1.8	34.5	0.071	1.358
1.80X035.5	A0355	1.8	35.5	0.071	1.398
1.80X036.5	A0365	1.8	36.5	0.071	1.437
1.80X037.5	A0375	1.8	37.5	0.071	1.476
1.80X038.7	A0387	1.8	38.7	0.071	1.524
1.80X040	A0400	1.8	40	0.071	1.575
1.80X041.2	A0412	1.8	41.2	0.071	1.622
1.80X042.5	A0425	1.8	42.5	0.071	1.673
1.80X043.7	A0437	1.8	43.7	0.071	1.72
1.80X045	A0450	1.8	45	0.071	1.772
1.80X047.5	A0475	1.8	47.5	0.071	1.87
1.80X050	A0500	1.8	50	0.071	1.969
1.80X053	A0530	1.8	53	0.071	2.087
1.80X056	A0560	1.8	56	0.071	2.205
1.80X060	A0600	1.8	60	0.071	2.362
1.80X063	A0630	1.8	63	0.071	2.48
1.80X067	A0670	1.8	67	0.071	2.638
1.80X071	A0710	1.8	71	0.071	2.795
1.80X075	A0750	1.8	75	0.071	2.953
1.80X080	A0800	1.8	80	0.071	3.15
1.80X085	A0850	1.8	85	0.071	3.346
1.80X090	A0900	1.8	90	0.071	3.543
1.80X095	A0950	1.8	95	0.071	3.74
1.80X100	A1000	1.8	100	0.071	3.937
1.80X106	A1060	1.8	106	0.071	4.173
1.80X112	A1120	1.8	112	0.071	4.409
1.80X118	A1180	1.8	118	0.071	4.646
1.80X125	Al250	1.8	125	0.071	4.921
2.65X004.5	B0045	2.65	4.5	0.104	0.177
2.65X005.3	B0053	2.65	5.3	0.104	0.209
2.65X006	B0060	2.65	6	0.104	0.236
2.65X006.9	B0069	2.65	6.9	0.104	0.272
2.65X008	B0080	2.65	8	0.104	0.315
2.65X009	B0090	2.65	9	0.104	0.354
2.65X009.5	B0095	2.65	9.5	0.104	0.374
2.65X010	B0100	2.65	10	0.104	0.394
2.65X010.6	B0106	2.65	10.6	0.104	0.417
2.65X011.2	B0112	2.65	11.2	0.104	0.441
2.65X011.8	B0118	2.65	11.8	0.104	0.465
2.65X012.5	B0125	2.65	12.5	0.104	0.492
2.65X013.2	B0132	2.65	13.2	0.104	0.52
2.65X014	B0140	2.65	14	0.104	0.551
2.65X015	B0150	2.65	15	0.104	0.591
2.65X016	B0160	2.65	16	0.104	0.63
2.65X017	B0170	2.65	17	0.104	0.669
2.65X018	B0180	2.65	18	0.104	0.709
2.65X019	B0190	2.65	19	0.104	0.748
2.65X020	B0200	2.65	20	0.104	0.787
2.65X021.2	B0212	2.65	21.2	0.104	0.835
2.65X022.4	B0224	2.65	22.4	0.104	0.882
2.65X023.6	B0236	2.65	23.6	0.104	0.929
2.65X025	B0250	2.65	25	0.104	0.984
2.65X025.8	B0258	2.65	25.8	0.104	1.016
2.65X026.5	B0265	2.65	26.5	0.104	1.043
2.65X028	B0280	2.65	28	0.104	1.102
2.65X030	B0300	2.65	30	0.104	1.181
2.65X031.5	B0315	2.65	31.5	0.104	1.24
2.65X032.5	B0325	2.65	32.5	0.104	1.28
2.65X033.5	B0335	2.65	33.5	0.104	1.319
2.65X034.5	B0345	2.65	34.5	0.104	1.358
2.65X035.5	B0355	2.65	35.5	0.104	1.398
2.65X036.5	B0365	2.65	36.5	0.104	1.437
2.65X037.5	B0375	2.65	37.5	0.104	1.476
2.65X038.7	B0387	2.65	38.7	0.104	1.524
2.65X040	B0400	2.65	40	0.104	1.575
2.65X041.2	B0412	2.65	41.2	0.104	1.622
2.65X042.5	B0425	2.65	42.5	0.104	1.673
2.65X043.7	B0437	2.65	43.7	0.104	1.72
2.65X045	B0450	2.65	45	0.104	1.772
2.65X046.2	B0462	2.65	46.2	0.104	1.819
2.65X047.5	B0475	2.65	47.5	0.104	1.87
2.65X048.7	B0487	2.65	48.7	0.104	1.917
2.65X050	B0500	2.65	50	0.104	1.969
2.65X051.5	B0515	2.65	51.5	0.104	2.028
2.65X053	B0530	2.65	53	0.104	2.087
2.65X054.5	B0545	2.65	54.5	0.104	2.146
2.65X056	B0560	2.65	56	0.104	2.205
2.65X058	B0580	2.65	58	0.104	2.283
2.65X060	B0600	2.65	60	0.104	2.362
2.65X061.5	B0615	2.65	61.5	0.104	2.421
2.65X063	B0630	2.65	63	0.104	2.48
2.65X065	B0650	2.65	65	0.104	2.559
2.65X067	B0670	2.65	67	0.104	2.638
2.65X069	B0690	2.65	69	0.104	2.717
2.65X071	B0710	2.65	71	0.104	2.795
2.65X073	B0730	2.65	73	0.104	2.874
2.65X075	B0750	2.65	75	0.104	2.953
2.65X080	B0800	2.65	80	0.104	3.15
2.65X085	B0850	2.65	85	0.104	3.346
2.65X090	B0900	2.65	90	0.104	3.543
2.65X095	B0950	2.65	95	0.104	3.74
2.65X100	B1000	2.65	100	0.104	3.937
2.65X106	B1060	2.65	106	0.104	4.173
2.65X112	B1120	2.65	112	0.104	4.409
2.65X118	B1180	2.65	118	0.104	4.646
2.65X125	B1250	2.65	125	0.104	4.921
2.65X132	B1320	2.65	132	0.104	5.197
2.65X140	B1400	2.65	140	0.104	5.512
2.65X150	B1500	2.65	150	0.104	5.906
2.65X160	B1600	2.65	160	0.104	6.299
2.65X170	B1700	2.65	170	0.104	6.693
2.65X180	B1800	2.65	180	0.104	7.087
2.65X190	B1900	2.65	190	0.104	7.48
2.65X200	B2000	2.65	200	0.104	7.874
2.65X212	B2120	2.65	212	0.104	8.346
2.65X224	B2240	2.65	224	0.104	8.819
2.65X230	B2300	2.65	230	0.104	9.055
2.65X236	B2360	2.65	236	0.104	9.291
2.65X243	B2430	2.65	243	0.104	9.567
2.65X250	B2500	2.65	250	0.104	9.843
3.55X014	C0140	3.55	14	0.14	0.551
3.55X015	C0150	3.55	15	0.14	0.591
3.55X016	C0160	3.55	16	0.14	0.63
3.55X017	C0170	3.55	17	0.14	0.669
3.55X018	C0180	3.55	18	0.14	0.709
3.55X019	C0190	3.55	19	0.14	0.748
3.55X040	C0400	3.55	40	0.14	1.575
3.55X041.2	C0412	3.55	41.2	0.14	1.622
3.55X042.5	C0425	3.55	42.5	0.14	1.673
3.55X043.7	C0437	3.55	43.7	0.14	1.72
3.55X045	C0450	3.55	45	0.14	1.772
3.55X046.2	C0462	3.55	46.2	0.14	1.819
3.55X047.5	C0475	3.55	47.5	0.14	1.87
3.55X048.7	C0487	3.55	48.7	0.14	1.917
3.55X060	C0600	3.55	60	0.14	2.362
3.55X061.5	C0615	3.55	61.5	0.14	2.421
3.55X063	C0630	3.55	63	0.14	2.48
3.55X065	C0650	3.55	65	0.14	2.559
3.55X067	C0670	3.55	67	0.14	2.638
3.55X069	C0690	3.55	69	0.14	2.717
3.55X071	C0710	3.55	71	0.14	2.795
3.55X073	C0730	3.55	73	0.14	2.874
3.55X075	C0750	3.55	75	0.14	2.953
3.55X077.5	C0775	3.55	77.5	0.14	3.051
3.55X080	C0800	3.55	80	0.14	3.15
3.55X082.5	C0825	3.55	82.5	0.14	3.248
3.55X085	C0850	3.55	85	0.14	3.346
3.55X087.5	C0875	3.55	87.5	0.14	3.445
3.55X090	C0900	3.55	90	0.14	3.543
3.55X092.5	C0925	3.55	92.5	0.14	3.642
3.55X095	C0950	3.55	95	0.14	3.74
3.55X097.5	C0975	3.55	97.5	0.14	3.839
3.55X100	C1000	3.55	100	0.14	3.937
3.55X103	C1030	3.55	103	0.14	4.055
3.55X106	C1060	3.55	106	0.14	4.173
3.55X109	C1090	3.55	109	0.14	4.291
3.55X112	C1120	3.55	112	0.14	4.409
3.55X115	C1150	3.55	115	0.14	4.528
3.55X118	C1180	3.55	118	0.14	4.646
3.55X122	C1220	3.55	122	0.14	4.803
3.55X125	C1250	3.55	125	0.14	4.921
3.55X128	C1280	3.55	128	0.14	5.039
3.55X132	C1320	3.55	132	0.14	5.197
3.55X136	C1360	3.55	136	0.14	5.354
3.55X140	C1400	3.55	140	0.14	5.512
3.55X145	C1450	3.55	145	0.14	5.709
3.55X150	C1500	3.55	150	0.14	5.906
3.55X155	C1550	3.55	155	0.14	6.102
3.55X160	C1600	3.55	160	0.14	6.299
3.55X165	C1650	3.55	165	0.14	6.496
3.55X170	C1700	3.55	170	0.14	6.693
3.55X175	C1750	3.55	175	0.14	6.89
3.55X180	C1800	3.55	180	0.14	7.087
3.55X185	C1850	3.55	185	0.14	7.283
3.55X190	C1900	3.55	190	0.14	7.48
3.55X195	C1950	3.55	195	0.14	7.677
3.55X200	C2000	3.55	200	0.14	7.874
3.55X212	C2120	3.55	212	0.14	8.346
3.55X218	C2180	3.55	218	0.14	8.583
3.55X224	C2240	3.55	224	0.14	8.819
3.55X230	C2300	3.55	230	0.14	9.055
3.55X236	C2360	3.55	236	0.14	9.291
3.55X250	C2500	3.55	250	0.14	9.843
3.55X258	C2580	3.55	258	0.14	10.157
3.55X265	C2650	3.55	265	0.14	10.433
3.55X280	C2800	3.55	280	0.14	11.024
3.55X290	C2900	3.55	290	0.14	11.417
3.55X300	C3000	3.55	300	0.14	11.811
3.55X307	C3070	3.55	307	0.14	12.087
3.55X315	C3150	3.55	315	0.14	12.402
3.55X335	C3350	3.55	335	0.14	13.189
3.55X355	C3550	3.55	355	0.14	13.976
3.55X020	CO200	3.55	20	0.14	0.787
3.55X021.2	CO212	3.55	21.2	0.14	0.835
3.55X022.4	CO224	3.55	22.4	0.14	0.882
3.55X023.6	CO236	3.55	23.6	0.14	0.929
3.55X025	CO250	3.55	25	0.14	0.984
3.55X025.8	CO258	3.55	25.8	0.14	1.016
3.55X026.5	CO265	3.55	26.5	0.14	1.043
3.55X028	CO280	3.55	28	0.14	1.102
3.55X030	CO300	3.55	30	0.14	1.181
3.55X031.5	CO315	3.55	31.5	0.14	1.24
3.55X032.5	CO325	3.55	32.5	0.14	1.28
3.55X033.5	CO335	3.55	33.5	0.14	1.319
3.55X034.5	CO345	3.55	34.5	0.14	1.358
3.55X035.5	CO355	3.55	35.5	0.14	1.398
3.55X036.5	CO365	3.55	36.5	0.14	1.437
3.55X037.5	CO375	3.55	37.5	0.14	1.476
3.55X038.7	CO387	3.55	38.7	0.14	1.524
3.55X050	CO500	3.55	50	0.14	1.969
3.55X051.5	CO515	3.55	51.5	0.14	2.028
3.55X053	CO530	3.55	53	0.14	2.087
3.55X054.5	CO545	3.55	54.5	0.14	2.146
3.55X056	CO560	3.55	56	0.14	2.205
3.55X058	CO580	3.55	58	0.14	2.283
5.30X037.5	D0375	5.3	37.5	0.209	1.476
5.30X038.7	D0387	5.3	38.7	0.209	1.524
5.30X040	D0400	5.3	40	0.209	1.575
5.30X041.2	D0412	5.3	41.2	0.209	1.622
5.30X042.5	D0425	5.3	42.5	0.209	1.673
5.30X043.7	D0437	5.3	43.7	0.209	1.72
5.30X045	D0450	5.3	45	0.209	1.772
5.30X046.2	D0462	5.3	46.2	0.209	1.819
5.30X047.5	D0475	5.3	47.5	0.209	1.87
5.30X048.7	D0487	5.3	48.7	0.209	1.917
5.30X050	D0500	5.3	50	0.209	1.969
5.30X051.5	D0515	5.3	51.5	0.209	2.028
5.30X053	D0530	5.3	53	0.209	2.087
5.30X054.5	D0545	5.3	54.5	0.209	2.146
5.30X056	D0560	5.3	56	0.209	2.205
5.30X058	D0580	5.3	58	0.209	2.283
5.30X060	D0600	5.3	60	0.209	2.362
5.30X061.5	D0615	5.3	61.5	0.209	2.421
5.30X063	D0630	5.3	63	0.209	2.48
5.30X065	D0650	5.3	65	0.209	2.559
5.30X067	D0670	5.3	67	0.209	2.638
5.30X069	D0690	5.3	69	0.209	2.717
5.30X071	D0710	5.3	71	0.209	2.795
5.30X073	D0730	5.3	73	0.209	2.874
5.30X075	D0750	5.3	75	0.209	2.953
5.30X077.5	D0775	5.3	77.5	0.209	3.051
5.30X080	D0800	5.3	80	0.209	3.15
5.30X082.5	D0825	5.3	82.5	0.209	3.248
5.30X085	D0850	5.3	85	0.209	3.346
5.30X087.5	D0875	5.3	87.5	0.209	3.445
5.30X090	D0900	5.3	90	0.209	3.543
5.30X092.5	D0925	5.3	92.5	0.209	3.642
5.30X095	D0950	5.3	95	0.209	3.74
5.30X097.5	D0975	5.3	97.5	0.209	3.839
5.30X100	D1000	5.3	100	0.209	3.937
5.30X103	D1030	5.3	103	0.209	4.055
5.30X106	D1060	5.3	106	0.209	4.173
5.30X109	D1090	5.3	109	0.209	4.291
5.30X112	D1120	5.3	112	0.209	4.409
5.30X115	D1150	5.3	115	0.209	4.528
5.30X118	D1180	5.3	118	0.209	4.646
5.30X122	D1220	5.3	122	0.209	4.803
5.30X125	D1250	5.3	125	0.209	4.921
5.30X128	D1280	5.3	128	0.209	5.039
5.30X132	D1320	5.3	132	0.209	5.197
5.30X136	D1360	5.3	136	0.209	5.354
5.30X140	D1400	5.3	140	0.209	5.512
5.30X145	D1450	5.3	145	0.209	5.709
5.30X150	D1500	5.3	150	0.209	5.906
5.30X155	D1550	5.3	155	0.209	6.102
5.30X160	D1600	5.3	160	0.209	6.299
5.30X165	D1650	5.3	165	0.209	6.496
5.30X170	D1700	5.3	170	0.209	6.693
5.30X175	D1750	5.3	175	0.209	6.89
5.30X180	D1800	5.3	180	0.209	7.087
5.30X185	D1850	5.3	185	0.209	7.283
5.30X190	D1900	5.3	190	0.209	7.48
5.30X195	D1950	5.3	195	0.209	7.677
5.30X200	D2000	5.3	200	0.209	7.874
7.00X109	E1090	7	109	0.276	4.291
7.00X112	E1120	7	112	0.276	4.409
7.00X115	E1150	7	115	0.276	4.528
7.00X118	E1180	7	118	0.276	4.646
7.00X122	E1220	7	122	0.276	4.803
7.00X125	E1250	7	125	0.276	4.921
7.00X128	E1280	7	128	0.276	5.039
7.00X132	E1320	7	132	0.276	5.197
7.00X136	E1360	7	136	0.276	5.354
7.00X140	E1400	7	140	0.276	5.512
7.00X145	E1450	7	145	0.276	5.709
7.00X150	E1500	7	150	0.276	5.906
7.00X155	E1550	7	155	0.276	6.102
7.00X160	E1600	7	160	0.276	6.299
7.00X165	E1650	7	165	0.276	6.496
7.00X170	E1700	7	170	0.276	6.693
7.00X175	E1750	7	175	0.276	6.89
7.00X180	E1800	7	180	0.276	7.087
7.00X185	E1850	7	185	0.276	7.283
7.00X190	E1900	7	190	0.276	7.48
7.00X195	E1950	7	195	0.276	7.677
7.00X200	E2000	7	200	0.276	7.874
7.00X206	E2060	7	206	0.276	8.11
7.00X212	E2120	7	212	0.276	8.346
7.00X218	E2180	7	218	0.276	8.583
7.00X224	E2240	7	224	0.276	8.819
7.00X230	E2300	7	230	0.276	9.055
7.00X236	E2360	7	236	0.276	9.291
7.00X243	E2430	7	243	0.276	9.567
7.00X250	E2500	7	250	0.276	9.843
7.00X258	E2580	7	258	0.276	10.157
7.00X265	E2650	7	265	0.276	10.433
7.00X272	E2720	7	272	0.276	10.709
7.00X280	E2800	7	280	0.276	11.024
7.00X290	E2900	7	290	0.276	11.417
7.00X300	E3000	7	300	0.276	11.811
7.00X307	E3070	7	307	0.276	12.087
7.00X315	E3150	7	315	0.276	12.402
7.00X325	E3250	7	325	0.276	12.795
7.00X335	E3350	7	335	0.276	13.189
7.00X345	E3450	7	345	0.276	13.583
7.00X355	E3550	7	355	0.276	13.976
7.00X365	E3650	7	365	0.276	14.37
7.00X375	E3750	7	375	0.276	14.764
7.00X387	E3870	7	387	0.276	15.236
7.00X400	E4000	7	400	0.276	15.748
7.00X412	E4120	7	412	0.276	16.22
7.00X425	E4250	7	425	0.276	16.732
7.00X437	E4370	7	437	0.276	17.205
7.00X450	E4500	7	450	0.276	17.717
7.00X462	E4620	7	462	0.276	18.189
7.00X475	E4750	7	475	0.276	18.701
7.00X487	E4870	7	487	0.276	19.173
7.00X500	E5000	7	500	0.276	19.685
7.00X515	E5150	7	515	0.276	20.276
7.00X530	E5300	7	530	0.276	20.866
7.00X545	E5450	7	545	0.276	21.457
7.00X560	E5600	7	560	0.276	22.047
7.00X580	E5800	7	580	0.276	22.835
7.00X600	E6000	7	600	0.276	23.622
7.00X615	E6150	7	615	0.276	24.213
7.00X630	E6300	7	630	0.276	24.803
7.00X650	E6500	7	650	0.276	25.591
7.00X670	E6700	7	670	0.276	26.378
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