DIN 3771 Metric O-Rings

The DIN 3771 o-ring standard is issued by The German Institute for Standards (Duetsches Institut für Normung). This standard identifies O-Ring sizes by the ID x C/S, and may be followed by a letter indicating the quality level (N – normal quality; S – special quality), and a code indicating the rubber polymer and IRHD hardness.

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

DIN 3771 Size Chart

Global Part#	Reference	C/S (MM)	I.D. (MM)	C/S (Inch)	I.D. (Inch)
1.80X001.8	1.8 X 1.8	1.8	1.8	0.071	0.071
1.80X002	2 X 1.8	1.8	2	0.071	0.079
1.80X002.24	2.24 X 1.8	1.8	2.24	0.071	0.088
1.80X002.5	2.5 X 1.8	1.8	2.5	0.071	0.098
1.80X002.8	2.8 X 1.8	1.8	2.8	0.071	0.11
1.80X003.15	3.15 X 1.8	1.8	3.15	0.071	0.124
1.80X003.55	3.55 X 1.8	1.8	3.55	0.071	0.14
1.80X003.75	3.75 X 1.8	1.8	3.75	0.071	0.148
1.80X004	4 X 1.8	1.8	4	0.071	0.157
1.80X004.5	4.5 X 1.8	1.8	4.5	0.071	0.177
1.80X004.87	4.87 X 1.8	1.8	4.87	0.071	0.192
1.80X005	5 X 1.8	1.8	5	0.071	0.197
1.80X005.15	5.15 X 1.8	1.8	5.15	0.071	0.203
1.80X005.3	5.3 X 1.8	1.8	5.3	0.071	0.209
1.80X005.6	5.6 X 1.8	1.8	5.6	0.071	0.22
1.80X006	6 X 1.8	1.8	6	0.071	0.236
1.80X006.3	6.3 X 1.8	1.8	6.3	0.071	0.248
1.80X006.7	6.7 X 1.8	1.8	6.7	0.071	0.264
1.80X006.9	6.9 X 1.8	1.8	6.9	0.071	0.272
1.80X007.1	7.1 X 1.8	1.8	7.1	0.071	0.28
1.80X007.5	7.5 X 1.8	1.8	7.5	0.071	0.295
1.80X008	8 X 1.8	1.8	8	0.071	0.315
1.80X008.5	8.5 X 1.8	1.8	8.5	0.071	0.335
1.80X008.75	8.75 X 1.8	1.8	8.75	0.071	0.344
1.80X009	9 X 1.8	1.8	9	0.071	0.354
1.80X009.5	9.5 X 1.8	1.8	9.5	0.071	0.374
1.80X010	10 X 1.8	1.8	10	0.071	0.394
1.80X010.6	10.6 X 1.8	1.8	10.6	0.071	0.417
1.80X011.2	11.2 X 1.8	1.8	11.2	0.071	0.441
1.80X011.8	11.8 X 1.8	1.8	11.8	0.071	0.465
1.80X012.5	12.5 X 1.8	1.8	12.5	0.071	0.492
1.80X013.2	13.2 X 1.8	1.8	13.2	0.071	0.52
1.80X014	14 X 1.8	1.8	14	0.071	0.551
1.80X015	15 X 1.8	1.8	15	0.071	0.591
1.80X016	16 X 1.8	1.8	16	0.071	0.63
1.80X017	17 X 1.8	1.8	17	0.071	0.669
2.65X014	14 X 2.65	2.65	14	0.104	0.551
2.65X015	15 X 2.65	2.65	15	0.104	0.591
2.65X016	16 X 2.65	2.65	16	0.104	0.63
2.65X017	17 X 2.65	2.65	17	0.104	0.669
2.65X018	18 X 2.65	2.65	18	0.104	0.709
2.65X019	19 X 2.65	2.65	19	0.104	0.748
2.65X020	20 X 2.65	2.65	20	0.104	0.787
2.65X021.2	21.2 X 2.65	2.65	21.2	0.104	0.835
2.65X022.4	22.4 X 2.65	2.65	22.4	0.104	0.882
2.65X023.6	23.6 X 2.65	2.65	23.6	0.104	0.929
2.65X025	25 X 2.65	2.65	25	0.104	0.984
2.65X025.8	25.8 X 2.65	2.65	25.8	0.104	1.016
2.65X026.5	26.5 X 2.65	2.65	26.5	0.104	1.043
2.65X028	28 X 2.65	2.65	28	0.104	1.102
2.65X030	30 X 2.65	2.65	30	0.104	1.181
2.65X031.5	31.5 X 2.65	2.65	31.5	0.104	1.24
2.65X032.5	32.5 X 2.65	2.65	32.5	0.104	1.28
2.65X033.5	33.5 X 2.65	2.65	33.5	0.104	1.319
2.65X034.5	34.5 X 2.65	2.65	34.5	0.104	1.358
2.65X035.5	35.5 X 2.65	2.65	35.5	0.104	1.398
2.65X036.5	36.5 X 2.65	2.65	36.5	0.104	1.437
2.65X037.5	37.5 X 2.65	2.65	37.5	0.104	1.476
2.65X038.7	38.7 X 2.65	2.65	38.7	0.104	1.524
3.55X018	18 X 3.55	3.55	18	0.14	0.709
3.55X019	19 X 3.55	3.55	19	0.14	0.748
3.55X020	20 X 3.55	3.55	20	0.14	0.787
3.55X021.2	21.2 X 3.55	3.55	21.2	0.14	0.835
3.55X022.4	22.4 X 3.55	3.55	22.4	0.14	0.882
3.55X023.6	23.6 X 3.55	3.55	23.6	0.14	0.929
3.55X025	25 X 3.55	3.55	25	0.14	0.984
3.55X025.8	25.8 X 3.55	3.55	25.8	0.14	1.016
3.55X026.5	26.5 X 3.55	3.55	26.5	0.14	1.043
3.55X028	28 X 3.55	3.55	28	0.14	1.102
3.55X030	30 X 3.55	3.55	30	0.14	1.181
3.55X031.5	31.5 X 3.55	3.55	31.5	0.14	1.24
3.55X032.5	32.5 X 3.55	3.55	32.5	0.14	1.28
3.55X033.5	33.5 X 3.55	3.55	33.5	0.14	1.319
3.55X034.5	34.5 X 3.55	3.55	34.5	0.14	1.358
3.55X035.5	35.5 X 3.55	3.55	35.5	0.14	1.398
3.55X036.5	36.5 X 3.55	3.55	36.5	0.14	1.437
3.55X037.5	37.5 X 3.55	3.55	37.5	0.14	1.476
3.55X038.7	38.7 X 3.55	3.55	38.7	0.14	1.524
3.55X040	40 X 3.55	3.55	40	0.14	1.575
3.55X041.2	41.2 X 3.55	3.55	41.2	0.14	1.622
3.55X042.5	42.5 X 3.55	3.55	42.5	0.14	1.673
3.55X043.7	43.7 X 3.55	3.55	43.7	0.14	1.72
3.55X045	45 X 3.55	3.55	45	0.14	1.772
3.55X046.2	46.2 X 3.55	3.55	46.2	0.14	1.819
3.55X047.5	47.5 X 3.55	3.55	47.5	0.14	1.87
3.55X048.7	48.7 X 3.55	3.55	48.7	0.14	1.917
3.55X050	50 X 3.55	3.55	50	0.14	1.969
3.55X051.5	51.5 X 3.55	3.55	51.5	0.14	2.028
3.55X053	53 X 3.55	3.55	53	0.14	2.087
3.55X054.5	54.5 X 3.55	3.55	54.5	0.14	2.146
3.55X056	56 X 3.55	3.55	56	0.14	2.205
3.55X058	58 X 3.55	3.55	58	0.14	2.283
3.55X060	60 X 3.55	3.55	60	0.14	2.362
3.55X061.5	61.5 X 3.55	3.55	61.5	0.14	2.421
3.55X063	63 X 3.55	3.55	63	0.14	2.48
3.55X065	65 X 3.55	3.55	65	0.14	2.559
3.55X067	67 X 3.55	3.55	67	0.14	2.638
3.55X069	69 X 3.55	3.55	69	0.14	2.717
3.55X071	71 X 3.55	3.55	71	0.14	2.795
3.55X073	73 X 3.55	3.55	73	0.14	2.874
3.55X075	75 X 3.55	3.55	75	0.14	2.953
3.55X077.5	77.5 X 3.55	3.55	77.5	0.14	3.051
3.55X080	80 X 3.55	3.55	80	0.14	3.15
3.55X082.5	82.5 X 3.55	3.55	82.5	0.14	3.248
3.55X085	85 X 3.55	3.55	85	0.14	3.346
3.55X087.5	87.5 X 3.55	3.55	87.5	0.14	3.445
3.55X090	90 X 3.55	3.55	90	0.14	3.543
3.55X092.5	92.5 X 3.55	3.55	92.5	0.14	3.642
3.55X095	95 X 3.55	3.55	95	0.14	3.74
3.55X097.5	97.5 X 3.55	3.55	97.5	0.14	3.839
3.55X100	100 X 3.55	3.55	100	0.14	3.937
3.55X103	103 X 3.55	3.55	103	0.14	4.055
3.55X106	106 X 3.55	3.55	106	0.14	4.173
3.55X109	109 X 3.55	3.55	109	0.14	4.291
3.55X112	112 X 3.55	3.55	112	0.14	4.409
3.55X115	115 X 3.55	3.55	115	0.14	4.528
3.55X118	118 X 3.55	3.55	118	0.14	4.646
3.55X122	122 X 3.55	3.55	122	0.14	4.803
3.55X125	125 X 3.55	3.55	125	0.14	4.921
3.55X128	128 X 3.55	3.55	128	0.14	5.039
3.55X132	132 X 3.55	3.55	132	0.14	5.197
3.55X136	136 X 3.55	3.55	136	0.14	5.354
3.55X140	140 X 3.55	3.55	140	0.14	5.512
3.55X145	145 X 3.55	3.55	145	0.14	5.709
3.55X150	150 X 3.55	3.55	150	0.14	5.906
3.55X155	155 X 3.55	3.55	155	0.14	6.102
3.55X160	160 X 3.55	3.55	160	0.14	6.299
3.55X165	165 X 3.55	3.55	165	0.14	6.496
3.55X170	170 X 3.55	3.55	170	0.14	6.693
3.55X175	175 X 3.55	3.55	175	0.14	6.89
3.55X180	180 X 3.55	3.55	180	0.14	7.087
3.55X185	185 X 3.55	3.55	185	0.14	7.283
3.55X190	190 X 3.55	3.55	190	0.14	7.48
3.55X195	195 X 3.55	3.55	195	0.14	7.677
3.55X200	200 X 3.55	3.55	200	0.14	7.874
5.30X040	40 X 5.3	5.3	40	0.209	1.575
5.30X041.2	41.2 X 5.3	5.3	41.2	0.209	1.622
5.30X042.5	42.5 X 5.3	5.3	42.5	0.209	1.673
5.30X043.7	43.7 X 5.3	5.3	43.7	0.209	1.72
5.30X045	45 X 5.3	5.3	45	0.209	1.772
5.30X046.2	46.2 X 5.3	5.3	46.2	0.209	1.819
5.30X047.5	47.5 X 5.3	5.3	47.5	0.209	1.87
5.30X048.7	48.7 X 5.3	5.3	48.7	0.209	1.917
5.30X050	50 X 5.3	5.3	50	0.209	1.969
5.30X051.5	51.5 X 5.3	5.3	51.5	0.209	2.028
5.30X053	53 X 5.3	5.3	53	0.209	2.087
5.30X054.5	54.5 X 5.3	5.3	54.5	0.209	2.146
5.30X056	56 X 5.3	5.3	56	0.209	2.205
5.30X058	58 X 5.3	5.3	58	0.209	2.283
5.30X060	60 X 5.3	5.3	60	0.209	2.362
5.30X061.5	61.5 X 5.3	5.3	61.5	0.209	2.421
5.30X063	63 X 5.3	5.3	63	0.209	2.48
5.30X065	65 X 5.3	5.3	65	0.209	2.559
5.30X067	67 X 5.3	5.3	67	0.209	2.638
5.30X069	69 X 5.3	5.3	69	0.209	2.717
5.30X071	71 X 5.3	5.3	71	0.209	2.795
5.30X073	73 X 5.3	5.3	73	0.209	2.874
5.30X075	75 X 5.3	5.3	75	0.209	2.953
5.30X077.5	77.5 X 5.3	5.3	77.5	0.209	3.051
5.30X080	80 X 5.3	5.3	80	0.209	3.15
5.30X082.5	82.5 X 5.3	5.3	82.5	0.209	3.248
5.30X085	85 X 5.3	5.3	85	0.209	3.346
5.30X087.5	87.5 X 5.3	5.3	87.5	0.209	3.445
5.30X090	90 X 5.3	5.3	90	0.209	3.543
5.30X092.5	92.5 X 5.3	5.3	92.5	0.209	3.642
5.30X095	95 X 5.3	5.3	95	0.209	3.74
5.30X097.5	97.5 X 5.3	5.3	97.5	0.209	3.839
5.30X100	100 X 5.3	5.3	100	0.209	3.937
5.30X103	103 X 5.3	5.3	103	0.209	4.055
5.30X106	106 X 5.3	5.3	106	0.209	4.173
5.30X109	109 X 5.3	5.3	109	0.209	4.291
5.30X112	112 X 5.3	5.3	112	0.209	4.409
5.30X115	115 X 5.3	5.3	115	0.209	4.528
5.30X118	118 X 5.3	5.3	118	0.209	4.646
5.30X122	122 X 5.3	5.3	122	0.209	4.803
5.30X125	125 X 5.3	5.3	125	0.209	4.921
5.30X128	128 X 5.3	5.3	128	0.209	5.039
5.30X132	132 X 5.3	5.3	132	0.209	5.197
5.30X136	136 X 5.3	5.3	136	0.209	5.354
5.30X140	140 X 5.3	5.3	140	0.209	5.512
5.30X145	145 X 5.3	5.3	145	0.209	5.709
5.30X150	150 X 5.3	5.3	150	0.209	5.906
5.30X155	155 X 5.3	5.3	155	0.209	6.102
5.30X160	160 X 5.3	5.3	160	0.209	6.299
5.30X165	165 X 5.3	5.3	165	0.209	6.496
5.30X170	170 X 5.3	5.3	170	0.209	6.693
5.30X175	175 X 5.3	5.3	175	0.209	6.89
5.30X180	180 X 5.3	5.3	180	0.209	7.087
5.30X185	185 X 5.3	5.3	185	0.209	7.283
5.30X190	190 X 5.3	5.3	190	0.209	7.48
5.30X195	195 X 5.3	5.3	195	0.209	7.677
5.30X200	200 X 5.3	5.3	200	0.209	7.874
5.30X206	206 X 5.3	5.3	206	0.209	8.11
5.30X212	212 X 5.3	5.3	212	0.209	8.346
5.30X218	218 X 5.3	5.3	218	0.209	8.583
5.30X224	224 X 5.3	5.3	224	0.209	8.819
5.30X230	230 X 5.3	5.3	230	0.209	9.055
5.30X236	236 X 5.3	5.3	236	0.209	9.291
5.30X243	243 X 5.3	5.3	243	0.209	9.567
5.30X250	250 X 5.3	5.3	250	0.209	9.843
5.30X258	258 X 5.3	5.3	258	0.209	10.157
5.30X265	265 X 5.3	5.3	265	0.209	10.433
5.30X272	272 X 5.3	5.3	272	0.209	10.709
5.30X280	280 X 5.3	5.3	280	0.209	11.024
5.30X290	290 X 5.3	5.3	290	0.209	11.417
5.30X300	300 X 5.3	5.3	300	0.209	11.811
5.30X307	307 X 5.3	5.3	307	0.209	12.087
5.30X315	315 X 5.3	5.3	315	0.209	12.402
5.30X325	325 X 5.3	5.3	325	0.209	12.795
5.30X335	335 X 5.3	5.3	335	0.209	13.189
5.30X345	345 X 5.3	5.3	345	0.209	13.583
5.30X355	355 X 5.3	5.3	355	0.209	13.976
5.30X365	365 X 5.3	5.3	365	0.209	14.37
5.30X375	375 X 5.3	5.3	375	0.209	14.764
5.30X387	387 X 5.3	5.3	387	0.209	15.236
5.30X400	400 X 5.3	5.3	400	0.209	15.748
7.00X206	206 X 7	7	206	0.276	8.11
7.00X212	212 X 7	7	212	0.276	8.346
7.00X218	218 X 7	7	218	0.276	8.583
7.00X224	224 X 7	7	224	0.276	8.819
7.00X230	230 X 7	7	230	0.276	9.055
7.00X236	236 X 7	7	236	0.276	9.291
7.00X243	243 X 7	7	243	0.276	9.567
7.00X250	250 X 7	7	250	0.276	9.843
7.00X258	258 X 7	7	258	0.276	10.157
7.00X265	265 X 7	7	265	0.276	10.433
7.00X272	272 X 7	7	272	0.276	10.709
7.00X280	280 X 7	7	280	0.276	11.024
7.00X290	290 X 7	7	290	0.276	11.417
7.00X300	300 X 7	7	300	0.276	11.811
7.00X307	307 X 7	7	307	0.276	12.087
7.00X315	315 X 7	7	315	0.276	12.402
7.00X325	325 X 7	7	325	0.276	12.795
7.00X335	335 X 7	7	335	0.276	13.189
7.00X345	345 X 7	7	345	0.276	13.583
7.00X355	355 X 7	7	355	0.276	13.976
7.00X365	365 X 7	7	365	0.276	14.37
7.00X375	375 X 7	7	375	0.276	14.764
7.00X387	387 X 7	7	387	0.276	15.236
7.00X400	400 X 7	7	400	0.276	15.748
7.00X412	412 X 7	7	412	0.276	16.22
7.00X425	425 X 7	7	425	0.276	16.732
7.00X437	437 X 7	7	437	0.276	17.205
7.00X450	450 X 7	7	450	0.276	17.717
7.00X462	462 X 7	7	462	0.276	18.189
7.00X475	475 X 7	7	475	0.276	18.701
7.00X487	487 X 7	7	487	0.276	19.173
7.00X500	500 X 7	7	500	0.276	19.685
7.00X515	515 X 7	7	515	0.276	20.276
7.00X530	530 X 7	7	530	0.276	20.866
7.00X545	545 X 7	7	545	0.276	21.457
7.00X560	560 X 7	7	560	0.276	22.047
7.00X580	580 X 7	7	580	0.276	22.835
7.00X600	600 X 7	7	600	0.276	23.622
7.00X615	615 X 7	7	615	0.276	24.213
7.00X630	630 X 7	7	630	0.276	24.803
7.00X650	650 X 7	7	650	0.276	25.591
7.00X670	670 X 7	7	670	0.276	26.378
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