Size reference

O-ring size charts

Nominal inside diameter and cross-section for AS568, metric, JIS B 2401 and BS 1806 sizes in millimetres and inches, with the grades we list at each size.

Public size references, not an official validation of any standard. Nominal dimensions; tolerances are reference values and your drawing governs.

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Listed in our catalog

394 AS568 sizes

Tol. ± is the reference tolerance for ID / CS in mm.

AS568 O-ring sizes: nominal inside diameter and cross-section in mm and inches, reference tolerance and grades listed in our catalog
			ID in	CS in	Tol. ± ID / CS
-001	0.74	1.02	0.029	0.040	±0.10 / ±0.08±0.004 / ±0.003 in	9 grades
-002	1.07	1.27	0.042	0.050	±0.10 / ±0.08±0.004 / ±0.003 in	14 grades
-003	1.42	1.52	0.056	0.060	±0.10 / ±0.08±0.004 / ±0.003 in	16 grades
-004	1.78	1.78	0.070	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	17 grades
-005	2.57	1.78	0.101	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	17 grades
-006	2.90	1.78	0.114	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	17 grades
-007	3.68	1.78	0.145	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	17 grades
-008	4.47	1.78	0.176	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	4 grades
-009	5.28	1.78	0.208	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	18 grades
-010	6.07	1.78	0.239	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	15 grades
-011	7.65	1.78	0.301	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	11 grades
-012	9.25	1.78	0.364	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	16 grades
-013	10.82	1.78	0.426	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	15 grades
-014	12.42	1.78	0.489	0.070	±0.13 / ±0.08±0.005 / ±0.003 in	16 grades
-015	14.00	1.78	0.551	0.070	±0.18 / ±0.08±0.007 / ±0.003 in	15 grades
-016	15.60	1.78	0.614	0.070	±0.23 / ±0.08±0.009 / ±0.003 in	17 grades
-017	17.17	1.78	0.676	0.070	±0.23 / ±0.08±0.009 / ±0.003 in	10 grades
-018	18.77	1.78	0.739	0.070	±0.23 / ±0.08±0.009 / ±0.003 in	16 grades
-019	20.35	1.78	0.801	0.070	±0.23 / ±0.08±0.009 / ±0.003 in	16 grades
-020	21.95	1.78	0.864	0.070	±0.23 / ±0.08±0.009 / ±0.003 in	15 grades
-021	23.52	1.78	0.926	0.070	±0.23 / ±0.08±0.009 / ±0.003 in	9 grades
-022	25.12	1.78	0.989	0.070	±0.25 / ±0.08±0.010 / ±0.003 in	16 grades
-023	26.70	1.78	1.051	0.070	±0.25 / ±0.08±0.010 / ±0.003 in	16 grades
-024	28.30	1.78	1.114	0.070	±0.25 / ±0.08±0.010 / ±0.003 in	17 grades
-025	29.87	1.78	1.176	0.070	±0.28 / ±0.08±0.011 / ±0.003 in	18 grades
-026	31.47	1.78	1.239	0.070	±0.28 / ±0.08±0.011 / ±0.003 in	16 grades
-027	33.05	1.78	1.301	0.070	±0.28 / ±0.08±0.011 / ±0.003 in	17 grades
-028	34.65	1.78	1.364	0.070	±0.33 / ±0.08±0.013 / ±0.003 in	15 grades
-029	37.82	1.78	1.489	0.070	±0.33 / ±0.08±0.013 / ±0.003 in	15 grades
-030	41.00	1.78	1.614	0.070	±0.33 / ±0.08±0.013 / ±0.003 in	16 grades
-031	44.17	1.78	1.739	0.070	±0.38 / ±0.08±0.015 / ±0.003 in	16 grades
-032	47.35	1.78	1.864	0.070	±0.38 / ±0.08±0.015 / ±0.003 in	9 grades
-033	50.52	1.78	1.989	0.070	±0.46 / ±0.08±0.018 / ±0.003 in	16 grades
-034	53.70	1.78	2.114	0.070	±0.46 / ±0.08±0.018 / ±0.003 in	10 grades
-035	56.87	1.78	2.239	0.070	±0.46 / ±0.08±0.018 / ±0.003 in	16 grades
-036	60.05	1.78	2.364	0.070	±0.46 / ±0.08±0.018 / ±0.003 in	7 grades
-037	63.22	1.78	2.489	0.070	±0.46 / ±0.08±0.018 / ±0.003 in	17 grades
-038	66.40	1.78	2.614	0.070	±0.51 / ±0.08±0.020 / ±0.003 in	14 grades
-039	69.57	1.78	2.739	0.070	±0.51 / ±0.08±0.020 / ±0.003 in	14 grades
-040	72.75	1.78	2.864	0.070	±0.51 / ±0.08±0.020 / ±0.003 in	8 grades
-041	75.92	1.78	2.989	0.070	±0.61 / ±0.08±0.024 / ±0.003 in	14 grades
-042	82.27	1.78	3.239	0.070	±0.61 / ±0.08±0.024 / ±0.003 in	7 grades
-043	88.62	1.78	3.489	0.070	±0.61 / ±0.08±0.024 / ±0.003 in	15 grades
-044	94.97	1.78	3.739	0.070	±0.69 / ±0.08±0.027 / ±0.003 in	13 grades
-045	101.32	1.78	3.989	0.070	±0.69 / ±0.08±0.027 / ±0.003 in	8 grades
-046	107.67	1.78	4.239	0.070	±0.76 / ±0.08±0.030 / ±0.003 in	7 grades
-047	114.02	1.78	4.489	0.070	±0.76 / ±0.08±0.030 / ±0.003 in	6 grades
-048	120.37	1.78	4.739	0.070	±0.76 / ±0.08±0.030 / ±0.003 in	7 grades
-049	126.72	1.78	4.989	0.070	±0.94 / ±0.08±0.037 / ±0.003 in	8 grades
-050	133.07	1.78	5.239	0.070	±0.94 / ±0.08±0.037 / ±0.003 in	13 grades
-102	1.24	2.62	0.049	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	15 grades
-103	2.06	2.62	0.081	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	14 grades
-104	2.84	2.62	0.112	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	15 grades
-105	3.63	2.62	0.143	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	14 grades
-106	4.42	2.62	0.174	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	15 grades
-107	5.23	2.62	0.206	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	16 grades
-108	6.02	2.62	0.237	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	15 grades
-109	7.59	2.62	0.299	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	10 grades
-110	9.19	2.62	0.362	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	16 grades
-111	10.77	2.62	0.424	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	10 grades
-112	12.37	2.62	0.487	0.103	±0.13 / ±0.08±0.005 / ±0.003 in	16 grades
-113	13.94	2.62	0.549	0.103	±0.18 / ±0.08±0.007 / ±0.003 in	10 grades
-114	15.54	2.62	0.612	0.103	±0.23 / ±0.08±0.009 / ±0.003 in	17 grades
-115	17.12	2.62	0.674	0.103	±0.23 / ±0.08±0.009 / ±0.003 in	11 grades
-116	18.72	2.62	0.737	0.103	±0.23 / ±0.08±0.009 / ±0.003 in	16 grades
-117	20.29	2.62	0.799	0.103	±0.25 / ±0.08±0.010 / ±0.003 in	17 grades
-118	21.89	2.62	0.862	0.103	±0.25 / ±0.08±0.010 / ±0.003 in	17 grades
-119	23.47	2.62	0.924	0.103	±0.25 / ±0.08±0.010 / ±0.003 in	15 grades
-120	25.07	2.62	0.987	0.103	±0.25 / ±0.08±0.010 / ±0.003 in	17 grades
-121	26.64	2.62	1.049	0.103	±0.25 / ±0.08±0.010 / ±0.003 in	17 grades
-122	28.24	2.62	1.112	0.103	±0.25 / ±0.08±0.010 / ±0.003 in	10 grades
-123	29.82	2.62	1.174	0.103	±0.30 / ±0.08±0.012 / ±0.003 in	16 grades
-124	31.42	2.62	1.237	0.103	±0.30 / ±0.08±0.012 / ±0.003 in	16 grades
-125	32.99	2.62	1.299	0.103	±0.30 / ±0.08±0.012 / ±0.003 in	12 grades
-126	34.59	2.62	1.362	0.103	±0.30 / ±0.08±0.012 / ±0.003 in	16 grades
-127	36.17	2.62	1.424	0.103	±0.30 / ±0.08±0.012 / ±0.003 in	17 grades
-128	37.77	2.62	1.487	0.103	±0.30 / ±0.08±0.012 / ±0.003 in	17 grades
-129	39.34	2.62	1.549	0.103	±0.38 / ±0.08±0.015 / ±0.003 in	16 grades
-130	40.94	2.62	1.612	0.103	±0.38 / ±0.08±0.015 / ±0.003 in	4 grades
-131	42.52	2.62	1.674	0.103	±0.38 / ±0.08±0.015 / ±0.003 in	16 grades
-132	44.12	2.62	1.737	0.103	±0.38 / ±0.08±0.015 / ±0.003 in	16 grades
-133	45.69	2.62	1.799	0.103	±0.38 / ±0.08±0.015 / ±0.003 in	16 grades
-134	47.29	2.62	1.862	0.103	±0.38 / ±0.08±0.015 / ±0.003 in	16 grades
-135	48.90	2.62	1.925	0.103	±0.43 / ±0.08±0.017 / ±0.003 in	16 grades
-136	50.47	2.62	1.987	0.103	±0.43 / ±0.08±0.017 / ±0.003 in	16 grades
-137	52.07	2.62	2.050	0.103	±0.43 / ±0.08±0.017 / ±0.003 in	17 grades
-138	53.64	2.62	2.112	0.103	±0.43 / ±0.08±0.017 / ±0.003 in	10 grades
-139	55.25	2.62	2.175	0.103	±0.43 / ±0.08±0.017 / ±0.003 in	15 grades
-140	56.82	2.62	2.237	0.103	±0.43 / ±0.08±0.017 / ±0.003 in	16 grades
-141	58.42	2.62	2.300	0.103	±0.51 / ±0.08±0.020 / ±0.003 in	16 grades
-142	59.99	2.62	2.362	0.103	±0.51 / ±0.08±0.020 / ±0.003 in	4 grades
-143	61.60	2.62	2.425	0.103	±0.51 / ±0.08±0.020 / ±0.003 in	18 grades
-144	63.17	2.62	2.487	0.103	±0.51 / ±0.08±0.020 / ±0.003 in	16 grades
-145	64.77	2.62	2.550	0.103	±0.51 / ±0.08±0.020 / ±0.003 in	15 grades
-146	66.34	2.62	2.612	0.103	±0.51 / ±0.08±0.020 / ±0.003 in	7 grades
-147	67.95	2.62	2.675	0.103	±0.56 / ±0.08±0.022 / ±0.003 in	15 grades
-148	69.52	2.62	2.737	0.103	±0.56 / ±0.08±0.022 / ±0.003 in	16 grades
-149	71.12	2.62	2.800	0.103	±0.56 / ±0.08±0.022 / ±0.003 in	15 grades
-150	72.69	2.62	2.862	0.103	±0.56 / ±0.08±0.022 / ±0.003 in	15 grades
-151	75.87	2.62	2.987	0.103	±0.61 / ±0.08±0.024 / ±0.003 in	15 grades
-152	82.22	2.62	3.237	0.103	±0.61 / ±0.08±0.024 / ±0.003 in	15 grades
-153	88.57	2.62	3.487	0.103	±0.61 / ±0.08±0.024 / ±0.003 in	16 grades
-154	94.92	2.62	3.737	0.103	±0.71 / ±0.08±0.028 / ±0.003 in	10 grades
-155	101.27	2.62	3.987	0.103	±0.71 / ±0.08±0.028 / ±0.003 in	16 grades
-156	107.62	2.62	4.237	0.103	±0.76 / ±0.08±0.030 / ±0.003 in	9 grades
-157	113.97	2.62	4.487	0.103	±0.76 / ±0.08±0.030 / ±0.003 in	11 grades
-158	120.32	2.62	4.737	0.103	±0.76 / ±0.08±0.030 / ±0.003 in	9 grades
-159	126.67	2.62	4.987	0.103	±0.89 / ±0.08±0.035 / ±0.003 in	18 grades
-160	133.02	2.62	5.237	0.103	±0.89 / ±0.08±0.035 / ±0.003 in	9 grades
-161	139.37	2.62	5.487	0.103	±0.89 / ±0.08±0.035 / ±0.003 in	8 grades
-162	145.72	2.62	5.737	0.103	±0.89 / ±0.08±0.035 / ±0.003 in	15 grades
-163	152.07	2.62	5.987	0.103	±0.89 / ±0.08±0.035 / ±0.003 in	15 grades
-164	158.42	2.62	6.237	0.103	±1.02 / ±0.08±0.040 / ±0.003 in	10 grades
-165	164.77	2.62	6.487	0.103	±1.02 / ±0.08±0.040 / ±0.003 in	8 grades
-166	171.12	2.62	6.737	0.103	±1.02 / ±0.08±0.040 / ±0.003 in	8 grades
-167	177.47	2.62	6.987	0.103	±1.02 / ±0.08±0.040 / ±0.003 in	15 grades
-168	183.82	2.62	7.237	0.103	±1.14 / ±0.08±0.045 / ±0.003 in	8 grades
-169	190.17	2.62	7.487	0.103	±1.14 / ±0.08±0.045 / ±0.003 in	7 grades
-170	196.52	2.62	7.737	0.103	±1.14 / ±0.08±0.045 / ±0.003 in	7 grades
-171	202.87	2.62	7.987	0.103	±1.14 / ±0.08±0.045 / ±0.003 in	13 grades
-172	209.22	2.62	8.237	0.103	±1.27 / ±0.08±0.050 / ±0.003 in	8 grades
-173	215.57	2.62	8.487	0.103	±1.27 / ±0.08±0.050 / ±0.003 in	7 grades
-174	221.92	2.62	8.737	0.103	±1.27 / ±0.08±0.050 / ±0.003 in	7 grades
-175	228.27	2.62	8.987	0.103	±1.27 / ±0.08±0.050 / ±0.003 in	7 grades
-176	234.62	2.62	9.237	0.103	±1.40 / ±0.08±0.055 / ±0.003 in	8 grades
-177	240.97	2.62	9.487	0.103	±1.40 / ±0.08±0.055 / ±0.003 in	8 grades
-178	247.32	2.62	9.737	0.103	±1.40 / ±0.08±0.055 / ±0.003 in	3 grades
-201	4.34	3.53	0.171	0.139	±0.13 / ±0.10±0.005 / ±0.004 in	15 grades
-202	5.94	3.53	0.234	0.139	±0.13 / ±0.10±0.005 / ±0.004 in	14 grades
-203	7.52	3.53	0.296	0.139	±0.13 / ±0.10±0.005 / ±0.004 in	13 grades
-204	9.12	3.53	0.359	0.139	±0.13 / ±0.10±0.005 / ±0.004 in	15 grades
-205	10.69	3.53	0.421	0.139	±0.13 / ±0.10±0.005 / ±0.004 in	15 grades
-206	12.29	3.53	0.484	0.139	±0.13 / ±0.10±0.005 / ±0.004 in	14 grades
-207	13.87	3.53	0.546	0.139	±0.18 / ±0.10±0.007 / ±0.004 in	13 grades
-208	15.47	3.53	0.609	0.139	±0.23 / ±0.10±0.009 / ±0.004 in	16 grades
-209	17.04	3.53	0.671	0.139	±0.23 / ±0.10±0.009 / ±0.004 in	15 grades
-210	18.64	3.53	0.734	0.139	±0.25 / ±0.10±0.010 / ±0.004 in	15 grades
-211	20.22	3.53	0.796	0.139	±0.25 / ±0.10±0.010 / ±0.004 in	16 grades
-212	21.82	3.53	0.859	0.139	±0.25 / ±0.10±0.010 / ±0.004 in	18 grades
-213	23.39	3.53	0.921	0.139	±0.25 / ±0.10±0.010 / ±0.004 in	13 grades
-214	24.99	3.53	0.984	0.139	±0.25 / ±0.10±0.010 / ±0.004 in	17 grades
-215	26.57	3.53	1.046	0.139	±0.25 / ±0.10±0.010 / ±0.004 in	11 grades
-216	28.17	3.53	1.109	0.139	±0.30 / ±0.10±0.012 / ±0.004 in	18 grades
-217	29.74	3.53	1.171	0.139	±0.30 / ±0.10±0.012 / ±0.004 in	14 grades
-218	31.34	3.53	1.234	0.139	±0.30 / ±0.10±0.012 / ±0.004 in	17 grades
-219	32.92	3.53	1.296	0.139	±0.30 / ±0.10±0.012 / ±0.004 in	17 grades
-220	34.52	3.53	1.359	0.139	±0.30 / ±0.10±0.012 / ±0.004 in	17 grades
-221	36.09	3.53	1.421	0.139	±0.30 / ±0.10±0.012 / ±0.004 in	14 grades
-222	37.69	3.53	1.484	0.139	±0.38 / ±0.10±0.015 / ±0.004 in	16 grades
-223	40.87	3.53	1.609	0.139	±0.38 / ±0.10±0.015 / ±0.004 in	16 grades
-224	44.04	3.53	1.734	0.139	±0.38 / ±0.10±0.015 / ±0.004 in	16 grades
-225	47.22	3.53	1.859	0.139	±0.46 / ±0.10±0.018 / ±0.004 in	16 grades
-226	50.39	3.53	1.984	0.139	±0.46 / ±0.10±0.018 / ±0.004 in	14 grades
-227	53.57	3.53	2.109	0.139	±0.46 / ±0.10±0.018 / ±0.004 in	17 grades
-228	56.74	3.53	2.234	0.139	±0.51 / ±0.10±0.020 / ±0.004 in	16 grades
-229	59.92	3.53	2.359	0.139	±0.51 / ±0.10±0.020 / ±0.004 in	17 grades
-230	63.09	3.53	2.484	0.139	±0.51 / ±0.10±0.020 / ±0.004 in	16 grades
-231	66.27	3.53	2.609	0.139	±0.51 / ±0.10±0.020 / ±0.004 in	15 grades
-232	69.44	3.53	2.734	0.139	±0.61 / ±0.10±0.024 / ±0.004 in	15 grades
-233	72.62	3.53	2.859	0.139	±0.61 / ±0.10±0.024 / ±0.004 in	16 grades
-234	75.79	3.53	2.984	0.139	±0.61 / ±0.10±0.024 / ±0.004 in	14 grades
-235	78.97	3.53	3.109	0.139	±0.61 / ±0.10±0.024 / ±0.004 in	15 grades
-236	82.14	3.53	3.234	0.139	±0.61 / ±0.10±0.024 / ±0.004 in	16 grades
-237	85.32	3.53	3.359	0.139	±0.61 / ±0.10±0.024 / ±0.004 in	15 grades
-238	88.49	3.53	3.484	0.139	±0.61 / ±0.10±0.024 / ±0.004 in	11 grades
-239	91.67	3.53	3.609	0.139	±0.71 / ±0.10±0.028 / ±0.004 in	15 grades
-240	94.84	3.53	3.734	0.139	±0.71 / ±0.10±0.028 / ±0.004 in	15 grades
-241	98.02	3.53	3.859	0.139	±0.71 / ±0.10±0.028 / ±0.004 in	15 grades
-242	101.19	3.53	3.984	0.139	±0.71 / ±0.10±0.028 / ±0.004 in	14 grades
-243	104.37	3.53	4.109	0.139	±0.71 / ±0.10±0.028 / ±0.004 in	16 grades
-244	107.54	3.53	4.234	0.139	±0.76 / ±0.10±0.030 / ±0.004 in	17 grades
-245	110.72	3.53	4.359	0.139	±0.76 / ±0.10±0.030 / ±0.004 in	17 grades
-246	113.89	3.53	4.484	0.139	±0.76 / ±0.10±0.030 / ±0.004 in	13 grades
-247	117.07	3.53	4.609	0.139	±0.76 / ±0.10±0.030 / ±0.004 in	16 grades
-248	120.24	3.53	4.734	0.139	±0.76 / ±0.10±0.030 / ±0.004 in	14 grades
-249	123.42	3.53	4.859	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	15 grades
-250	126.59	3.53	4.984	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	14 grades
-251	129.77	3.53	5.109	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	15 grades
-252	132.94	3.53	5.234	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	14 grades
-253	136.12	3.53	5.359	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	14 grades
-254	139.29	3.53	5.484	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	14 grades
-255	142.47	3.53	5.609	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	16 grades
-256	145.64	3.53	5.734	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	13 grades
-257	148.82	3.53	5.859	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	15 grades
-258	151.99	3.53	5.984	0.139	±0.89 / ±0.10±0.035 / ±0.004 in	14 grades
-259	158.34	3.53	6.234	0.139	±1.02 / ±0.10±0.040 / ±0.004 in	11 grades
-260	164.69	3.53	6.484	0.139	±1.02 / ±0.10±0.040 / ±0.004 in	14 grades
-261	171.04	3.53	6.734	0.139	±1.02 / ±0.10±0.040 / ±0.004 in	13 grades
-262	177.39	3.53	6.984	0.139	±1.02 / ±0.10±0.040 / ±0.004 in	14 grades
-263	183.74	3.53	7.234	0.139	±1.14 / ±0.10±0.045 / ±0.004 in	8 grades
-264	190.09	3.53	7.484	0.139	±1.14 / ±0.10±0.045 / ±0.004 in	7 grades
-265	196.44	3.53	7.734	0.139	±1.14 / ±0.10±0.045 / ±0.004 in	14 grades
-266	202.79	3.53	7.984	0.139	±1.14 / ±0.10±0.045 / ±0.004 in	14 grades
-267	209.14	3.53	8.234	0.139	±1.27 / ±0.10±0.050 / ±0.004 in	16 grades
-268	215.49	3.53	8.484	0.139	±1.27 / ±0.10±0.050 / ±0.004 in	14 grades
-269	221.84	3.53	8.734	0.139	±1.27 / ±0.10±0.050 / ±0.004 in	14 grades
-270	228.19	3.53	8.984	0.139	±1.27 / ±0.10±0.050 / ±0.004 in	14 grades
-271	234.54	3.53	9.234	0.139	±1.40 / ±0.10±0.055 / ±0.004 in	15 grades
-272	240.89	3.53	9.484	0.139	±1.40 / ±0.10±0.055 / ±0.004 in	15 grades
-273	247.24	3.53	9.734	0.139	±1.40 / ±0.10±0.055 / ±0.004 in	13 grades
-274	253.59	3.53	9.984	0.139	±1.40 / ±0.10±0.055 / ±0.004 in	14 grades
-275	266.29	3.53	10.484	0.139	±1.40 / ±0.10±0.055 / ±0.004 in	14 grades
-276	278.99	3.53	10.984	0.139	±1.65 / ±0.10±0.065 / ±0.004 in	13 grades
-277	291.69	3.53	11.484	0.139	±1.65 / ±0.10±0.065 / ±0.004 in	12 grades
-278	304.39	3.53	11.984	0.139	±1.65 / ±0.10±0.065 / ±0.004 in	13 grades
-279	329.79	3.53	12.984	0.139	±1.65 / ±0.10±0.065 / ±0.004 in	14 grades
-280	355.19	3.53	13.984	0.139	±1.65 / ±0.10±0.065 / ±0.004 in	13 grades
-281	380.59	3.53	14.984	0.139	±1.65 / ±0.10±0.065 / ±0.004 in	12 grades
-282	405.26	3.53	15.955	0.139	±1.91 / ±0.10±0.075 / ±0.004 in	14 grades
-283	430.66	3.53	16.955	0.139	±2.03 / ±0.10±0.080 / ±0.004 in	12 grades
-284	456.06	3.53	17.955	0.139	±2.16 / ±0.10±0.085 / ±0.004 in	13 grades
-309	10.46	5.33	0.412	0.210	±0.13 / ±0.13±0.005 / ±0.005 in	14 grades
-310	12.07	5.33	0.475	0.210	±0.13 / ±0.13±0.005 / ±0.005 in	15 grades
-311	13.64	5.33	0.537	0.210	±0.18 / ±0.13±0.007 / ±0.005 in	13 grades
-312	15.24	5.33	0.600	0.210	±0.23 / ±0.13±0.009 / ±0.005 in	12 grades
-313	16.81	5.33	0.662	0.210	±0.23 / ±0.13±0.009 / ±0.005 in	13 grades
-314	18.42	5.33	0.725	0.210	±0.25 / ±0.13±0.010 / ±0.005 in	14 grades
-315	19.99	5.33	0.787	0.210	±0.25 / ±0.13±0.010 / ±0.005 in	14 grades
-316	21.59	5.33	0.850	0.210	±0.25 / ±0.13±0.010 / ±0.005 in	14 grades
-317	23.16	5.33	0.912	0.210	±0.25 / ±0.13±0.010 / ±0.005 in	6 grades
-318	24.77	5.33	0.975	0.210	±0.25 / ±0.13±0.010 / ±0.005 in	14 grades
-319	26.34	5.33	1.037	0.210	±0.25 / ±0.13±0.010 / ±0.005 in	14 grades
-320	27.94	5.33	1.100	0.210	±0.30 / ±0.13±0.012 / ±0.005 in	10 grades
-321	29.51	5.33	1.162	0.210	±0.30 / ±0.13±0.012 / ±0.005 in	15 grades
-322	31.12	5.33	1.225	0.210	±0.30 / ±0.13±0.012 / ±0.005 in	14 grades
-323	32.69	5.33	1.287	0.210	±0.30 / ±0.13±0.012 / ±0.005 in	15 grades
-324	34.29	5.33	1.350	0.210	±0.30 / ±0.13±0.012 / ±0.005 in	14 grades
-325	37.47	5.33	1.475	0.210	±0.38 / ±0.13±0.015 / ±0.005 in	16 grades
-326	40.64	5.33	1.600	0.210	±0.38 / ±0.13±0.015 / ±0.005 in	11 grades
-327	43.82	5.33	1.725	0.210	±0.38 / ±0.13±0.015 / ±0.005 in	16 grades
-328	46.99	5.33	1.850	0.210	±0.38 / ±0.13±0.015 / ±0.005 in	11 grades
-329	50.17	5.33	1.975	0.210	±0.46 / ±0.13±0.018 / ±0.005 in	11 grades
-330	53.34	5.33	2.100	0.210	±0.46 / ±0.13±0.018 / ±0.005 in	14 grades
-331	56.52	5.33	2.225	0.210	±0.46 / ±0.13±0.018 / ±0.005 in	16 grades
-332	59.69	5.33	2.350	0.210	±0.46 / ±0.13±0.018 / ±0.005 in	11 grades
-333	62.87	5.33	2.475	0.210	±0.51 / ±0.13±0.020 / ±0.005 in	18 grades
-334	66.04	5.33	2.600	0.210	±0.51 / ±0.13±0.020 / ±0.005 in	16 grades
-335	69.22	5.33	2.725	0.210	±0.51 / ±0.13±0.020 / ±0.005 in	15 grades
-336	72.39	5.33	2.850	0.210	±0.51 / ±0.13±0.020 / ±0.005 in	10 grades
-337	75.57	5.33	2.975	0.210	±0.61 / ±0.13±0.024 / ±0.005 in	14 grades
-338	78.74	5.33	3.100	0.210	±0.61 / ±0.13±0.024 / ±0.005 in	15 grades
-339	81.92	5.33	3.225	0.210	±0.61 / ±0.13±0.024 / ±0.005 in	14 grades
-340	85.09	5.33	3.350	0.210	±0.61 / ±0.13±0.024 / ±0.005 in	15 grades
-341	88.27	5.33	3.475	0.210	±0.61 / ±0.13±0.024 / ±0.005 in	15 grades
-342	91.44	5.33	3.600	0.210	±0.71 / ±0.13±0.028 / ±0.005 in	15 grades
-343	94.62	5.33	3.725	0.210	±0.71 / ±0.13±0.028 / ±0.005 in	16 grades
-344	97.79	5.33	3.850	0.210	±0.71 / ±0.13±0.028 / ±0.005 in	11 grades
-345	100.97	5.33	3.975	0.210	±0.71 / ±0.13±0.028 / ±0.005 in	17 grades
-346	104.14	5.33	4.100	0.210	±0.71 / ±0.13±0.028 / ±0.005 in	18 grades
-347	107.32	5.33	4.225	0.210	±0.76 / ±0.13±0.030 / ±0.005 in	17 grades
-348	110.49	5.33	4.350	0.210	±0.76 / ±0.13±0.030 / ±0.005 in	17 grades
-349	113.67	5.33	4.475	0.210	±0.76 / ±0.13±0.030 / ±0.005 in	15 grades
-350	116.84	5.33	4.600	0.210	±0.76 / ±0.13±0.030 / ±0.005 in	14 grades
-351	120.02	5.33	4.725	0.210	±0.76 / ±0.13±0.030 / ±0.005 in	15 grades
-352	123.19	5.33	4.850	0.210	±0.76 / ±0.13±0.030 / ±0.005 in	11 grades
-353	126.37	5.33	4.975	0.210	±0.94 / ±0.13±0.037 / ±0.005 in	16 grades
-354	129.54	5.33	5.100	0.210	±0.94 / ±0.13±0.037 / ±0.005 in	15 grades
-355	132.72	5.33	5.225	0.210	±0.94 / ±0.13±0.037 / ±0.005 in	14 grades
-356	135.89	5.33	5.350	0.210	±0.94 / ±0.13±0.037 / ±0.005 in	11 grades
-357	139.07	5.33	5.475	0.210	±0.94 / ±0.13±0.037 / ±0.005 in	15 grades
-358	142.24	5.33	5.600	0.210	±0.94 / ±0.13±0.037 / ±0.005 in	16 grades
-359	145.42	5.33	5.725	0.210	±0.94 / ±0.13±0.037 / ±0.005 in	15 grades
-360	148.59	5.33	5.850	0.210	±0.94 / ±0.13±0.037 / ±0.005 in	10 grades
-361	151.77	5.33	5.975	0.210	±0.94 / ±0.13±0.037 / ±0.005 in	15 grades
-362	158.12	5.33	6.225	0.210	±1.02 / ±0.13±0.040 / ±0.005 in	14 grades
-363	164.47	5.33	6.475	0.210	±1.02 / ±0.13±0.040 / ±0.005 in	15 grades
-364	170.82	5.33	6.725	0.210	±1.02 / ±0.13±0.040 / ±0.005 in	15 grades
-365	177.17	5.33	6.975	0.210	±1.02 / ±0.13±0.040 / ±0.005 in	14 grades
-366	183.52	5.33	7.225	0.210	±1.14 / ±0.13±0.045 / ±0.005 in	14 grades
-367	189.87	5.33	7.475	0.210	±1.14 / ±0.13±0.045 / ±0.005 in	15 grades
-368	196.22	5.33	7.725	0.210	±1.14 / ±0.13±0.045 / ±0.005 in	13 grades
-369	202.57	5.33	7.975	0.210	±1.14 / ±0.13±0.045 / ±0.005 in	14 grades
-370	208.92	5.33	8.225	0.210	±1.27 / ±0.13±0.050 / ±0.005 in	14 grades
-371	215.27	5.33	8.475	0.210	±1.27 / ±0.13±0.050 / ±0.005 in	13 grades
-372	221.62	5.33	8.725	0.210	±1.27 / ±0.13±0.050 / ±0.005 in	15 grades
-373	227.97	5.33	8.975	0.210	±1.27 / ±0.13±0.050 / ±0.005 in	14 grades
-374	234.32	5.33	9.225	0.210	±1.40 / ±0.13±0.055 / ±0.005 in	15 grades
-375	240.67	5.33	9.475	0.210	±1.40 / ±0.13±0.055 / ±0.005 in	14 grades
-376	247.02	5.33	9.725	0.210	±1.40 / ±0.13±0.055 / ±0.005 in	16 grades
-377	253.37	5.33	9.975	0.210	±1.40 / ±0.13±0.055 / ±0.005 in	11 grades
-378	266.07	5.33	10.475	0.210	±1.52 / ±0.13±0.060 / ±0.005 in	14 grades
-379	278.77	5.33	10.975	0.210	±1.52 / ±0.13±0.060 / ±0.005 in	14 grades
-380	291.47	5.33	11.475	0.210	±1.65 / ±0.13±0.065 / ±0.005 in	15 grades
-381	304.17	5.33	11.975	0.210	±1.65 / ±0.13±0.065 / ±0.005 in	14 grades
-382	329.57	5.33	12.975	0.210	±1.65 / ±0.13±0.065 / ±0.005 in	15 grades
-383	354.97	5.33	13.975	0.210	±1.78 / ±0.13±0.070 / ±0.005 in	15 grades
-384	380.37	5.33	14.975	0.210	±1.78 / ±0.13±0.070 / ±0.005 in	14 grades
-385	405.26	5.33	15.955	0.210	±1.91 / ±0.13±0.075 / ±0.005 in	14 grades
-386	430.66	5.33	16.955	0.210	±2.03 / ±0.13±0.080 / ±0.005 in	13 grades
-387	456.06	5.33	17.955	0.210	±2.16 / ±0.13±0.085 / ±0.005 in	12 grades
-388	481.46	5.33	18.955	0.210	±2.29 / ±0.13±0.090 / ±0.005 in	13 grades
-389	506.86	5.33	19.955	0.210	±2.41 / ±0.13±0.095 / ±0.005 in	9 grades
-390	532.26	5.33	20.955	0.210	±2.41 / ±0.13±0.095 / ±0.005 in	5 grades
-391	557.66	5.33	21.955	0.210	±2.54 / ±0.13±0.100 / ±0.005 in	5 grades
-392	582.68	5.33	22.940	0.210	±2.67 / ±0.13±0.105 / ±0.005 in	14 grades
-393	608.08	5.33	23.940	0.210	±2.79 / ±0.13±0.110 / ±0.005 in	13 grades
-394	633.48	5.33	24.940	0.210	±2.92 / ±0.13±0.115 / ±0.005 in	14 grades
-395	658.88	5.33	25.940	0.210	±3.05 / ±0.13±0.120 / ±0.005 in	13 grades
-400	34.29	6.99	1.350	0.275	±0.37 / ±0.13general	12 grades
-401	37.47	6.99	1.475	0.275	±0.39 / ±0.13general	14 grades
-402	40.64	6.99	1.600	0.275	±0.42 / ±0.13general	11 grades
-403	43.82	6.99	1.725	0.275	±0.44 / ±0.13general	12 grades
-404	46.99	6.99	1.850	0.275	±0.46 / ±0.13general	12 grades
-405	50.17	6.99	1.975	0.275	±0.49 / ±0.13general	13 grades
-406	53.34	6.99	2.100	0.275	±0.51 / ±0.13general	12 grades
-407	56.52	6.99	2.225	0.275	±0.54 / ±0.13general	10 grades
-408	59.69	6.99	2.350	0.275	±0.55 / ±0.13general	12 grades
-409	62.87	6.99	2.475	0.275	±0.57 / ±0.13general	13 grades
-410	66.04	6.99	2.600	0.275	±0.60 / ±0.13general	12 grades
-411	69.22	6.99	2.725	0.275	±0.63 / ±0.13general	12 grades
-412	72.39	6.99	2.850	0.275	±0.64 / ±0.13general	10 grades
-413	75.57	6.99	2.975	0.275	±0.67 / ±0.13general	3 grades
-414	78.74	6.99	3.100	0.275	±0.69 / ±0.13general	11 grades
-415	81.92	6.99	3.225	0.275	±0.71 / ±0.13general	13 grades
-416	85.09	6.99	3.350	0.275	±0.74 / ±0.13general	12 grades
-417	88.27	6.99	3.475	0.275	±0.76 / ±0.13general	12 grades
-418	91.44	6.99	3.600	0.275	±0.77 / ±0.13general	12 grades
-419	94.62	6.99	3.725	0.275	±0.79 / ±0.13general	12 grades
-420	97.79	6.99	3.850	0.275	±0.81 / ±0.13general	13 grades
-421	100.97	6.99	3.975	0.275	±0.85 / ±0.13general	13 grades
-422	104.14	6.99	4.100	0.275	±0.87 / ±0.13general	13 grades
-423	107.32	6.99	4.225	0.275	±0.89 / ±0.13general	14 grades
-424	110.49	6.99	4.350	0.275	±0.91 / ±0.13general	13 grades
-425	113.67	6.99	4.475	0.275	±0.84 / ±0.15±0.033 / ±0.006 in	16 grades
-426	116.84	6.99	4.600	0.275	±0.84 / ±0.15±0.033 / ±0.006 in	15 grades
-427	120.02	6.99	4.725	0.275	±0.84 / ±0.15±0.033 / ±0.006 in	16 grades
-428	123.19	6.99	4.850	0.275	±0.84 / ±0.15±0.033 / ±0.006 in	13 grades
-429	126.37	6.99	4.975	0.275	±0.94 / ±0.15±0.037 / ±0.006 in	17 grades
-430	129.54	6.99	5.100	0.275	±0.94 / ±0.15±0.037 / ±0.006 in	15 grades
-431	132.72	6.99	5.225	0.275	±0.94 / ±0.15±0.037 / ±0.006 in	14 grades
-432	135.89	6.99	5.350	0.275	±0.94 / ±0.15±0.037 / ±0.006 in	7 grades
-433	139.07	6.99	5.475	0.275	±0.94 / ±0.15±0.037 / ±0.006 in	14 grades
-434	142.24	6.99	5.600	0.275	±0.94 / ±0.15±0.037 / ±0.006 in	15 grades
-435	145.42	6.99	5.725	0.275	±0.94 / ±0.15±0.037 / ±0.006 in	17 grades
-436	148.59	6.99	5.850	0.275	±0.94 / ±0.15±0.037 / ±0.006 in	14 grades
-437	151.77	6.99	5.975	0.275	±0.94 / ±0.15±0.037 / ±0.006 in	15 grades
-438	158.12	6.99	6.225	0.275	±1.02 / ±0.15±0.040 / ±0.006 in	16 grades
-439	164.47	6.99	6.475	0.275	±1.02 / ±0.15±0.040 / ±0.006 in	14 grades
-440	170.82	6.99	6.725	0.275	±1.02 / ±0.15±0.040 / ±0.006 in	16 grades
-441	177.17	6.99	6.975	0.275	±1.02 / ±0.15±0.040 / ±0.006 in	14 grades
-442	183.52	6.99	7.225	0.275	±1.14 / ±0.15±0.045 / ±0.006 in	15 grades
-443	189.87	6.99	7.475	0.275	±1.14 / ±0.15±0.045 / ±0.006 in	14 grades
-444	196.22	6.99	7.725	0.275	±1.14 / ±0.15±0.045 / ±0.006 in	16 grades
-445	202.57	6.99	7.975	0.275	±1.14 / ±0.15±0.045 / ±0.006 in	15 grades
-446	215.27	6.99	8.475	0.275	±1.40 / ±0.15±0.055 / ±0.006 in	15 grades
-447	227.97	6.99	8.975	0.275	±1.40 / ±0.15±0.055 / ±0.006 in	15 grades
-448	240.67	6.99	9.475	0.275	±1.40 / ±0.15±0.055 / ±0.006 in	14 grades
-449	253.37	6.99	9.975	0.275	±1.40 / ±0.15±0.055 / ±0.006 in	14 grades
-450	266.07	6.99	10.475	0.275	±1.52 / ±0.15±0.060 / ±0.006 in	14 grades
-451	278.77	6.99	10.975	0.275	±1.52 / ±0.15±0.060 / ±0.006 in	15 grades
-452	291.47	6.99	11.475	0.275	±1.52 / ±0.15±0.060 / ±0.006 in	15 grades
-453	304.17	6.99	11.975	0.275	±1.52 / ±0.15±0.060 / ±0.006 in	14 grades
-454	316.87	6.99	12.475	0.275	±1.52 / ±0.15±0.060 / ±0.006 in	14 grades
-455	329.57	6.99	12.975	0.275	±1.52 / ±0.15±0.060 / ±0.006 in	16 grades
-456	342.27	6.99	13.475	0.275	±1.78 / ±0.15±0.070 / ±0.006 in	14 grades
-457	354.97	6.99	13.975	0.275	±1.78 / ±0.15±0.070 / ±0.006 in	14 grades
-458	367.67	6.99	14.475	0.275	±1.78 / ±0.15±0.070 / ±0.006 in	14 grades
-459	380.37	6.99	14.975	0.275	±1.78 / ±0.15±0.070 / ±0.006 in	14 grades
-460	393.07	6.99	15.475	0.275	±1.78 / ±0.15±0.070 / ±0.006 in	12 grades
-461	405.26	6.99	15.955	0.275	±1.91 / ±0.15±0.075 / ±0.006 in	15 grades
-462	417.96	6.99	16.455	0.275	±1.91 / ±0.15±0.075 / ±0.006 in	14 grades
-463	430.66	6.99	16.955	0.275	±2.03 / ±0.15±0.080 / ±0.006 in	14 grades
-464	443.36	6.99	17.455	0.275	±2.16 / ±0.15±0.085 / ±0.006 in	14 grades
-465	456.06	6.99	17.955	0.275	±2.16 / ±0.15±0.085 / ±0.006 in	15 grades
-466	468.76	6.99	18.455	0.275	±2.16 / ±0.15±0.085 / ±0.006 in	13 grades
-467	481.46	6.99	18.955	0.275	±2.29 / ±0.15±0.090 / ±0.006 in	14 grades
-468	494.16	6.99	19.455	0.275	±2.29 / ±0.15±0.090 / ±0.006 in	15 grades
-469	506.86	6.99	19.955	0.275	±2.41 / ±0.15±0.095 / ±0.006 in	15 grades
-470	532.26	6.99	20.955	0.275	±2.41 / ±0.15±0.095 / ±0.006 in	14 grades
-471	557.66	6.99	21.955	0.275	±2.54 / ±0.15±0.100 / ±0.006 in	13 grades
-472	582.68	6.99	22.940	0.275	±2.67 / ±0.15±0.105 / ±0.006 in	13 grades
-473	608.08	6.99	23.940	0.275	±2.79 / ±0.15±0.110 / ±0.006 in	13 grades
-474	633.48	6.99	24.940	0.275	±2.92 / ±0.15±0.115 / ±0.006 in	13 grades
-475	658.88	6.99	25.940	0.275	±3.05 / ±0.15±0.120 / ±0.006 in	13 grades
-901	4.70	1.42	0.185	0.056	±0.13 / ±0.08±0.005 / ±0.003 in	11 grades
-902	6.07	1.63	0.239	0.064	±0.13 / ±0.08±0.005 / ±0.003 in	14 grades
-903	7.65	1.63	0.301	0.064	±0.13 / ±0.08±0.005 / ±0.003 in	10 grades
-904	8.92	1.83	0.351	0.072	±0.13 / ±0.08±0.005 / ±0.003 in	14 grades
-905	10.52	1.83	0.414	0.072	±0.13 / ±0.08±0.005 / ±0.003 in	15 grades
-906	11.89	1.98	0.468	0.078	±0.13 / ±0.08±0.005 / ±0.003 in	15 grades
-907	13.46	2.08	0.530	0.082	±0.18 / ±0.08±0.007 / ±0.003 in	13 grades
-908	16.36	2.21	0.644	0.087	±0.23 / ±0.08±0.009 / ±0.003 in	14 grades
-909	17.93	2.46	0.706	0.097	±0.23 / ±0.08±0.009 / ±0.003 in	13 grades
-910	19.18	2.46	0.755	0.097	±0.23 / ±0.08±0.009 / ±0.003 in	14 grades
-911	21.92	2.95	0.863	0.116	±0.23 / ±0.10±0.009 / ±0.004 in	13 grades
-912	23.47	2.95	0.924	0.116	±0.23 / ±0.10±0.009 / ±0.004 in	14 grades
-913	25.04	2.95	0.986	0.116	±0.25 / ±0.10±0.010 / ±0.004 in	14 grades
-914	26.59	2.95	1.047	0.116	±0.25 / ±0.10±0.010 / ±0.004 in	13 grades
-916	29.74	2.95	1.171	0.116	±0.25 / ±0.10±0.010 / ±0.004 in	13 grades
-918	34.42	2.95	1.355	0.116	±0.30 / ±0.10±0.012 / ±0.004 in	13 grades
-920	37.47	3.00	1.475	0.118	±0.36 / ±0.10±0.014 / ±0.004 in	14 grades
-924	43.69	3.00	1.720	0.118	±0.36 / ±0.10±0.014 / ±0.004 in	13 grades
-928	53.09	3.00	2.090	0.118	±0.46 / ±0.10±0.018 / ±0.004 in	13 grades
-932	59.36	3.00	2.337	0.118	±0.46 / ±0.10±0.018 / ±0.004 in	14 grades

Common metric O-ring sizes: nominal inside diameter and cross-section in mm and inches, reference tolerance and grades listed in our catalog
			ID in	CS in	Tol. ± ID / CS

JIS B 2401 O-ring sizes: nominal inside diameter and cross-section in mm and inches, reference tolerance and grades listed in our catalog
			ID in	CS in	Tol. ± ID / CS

BS 1806 O-ring sizes: nominal inside diameter and cross-section in mm and inches, reference tolerance and grades listed in our catalog
			ID in	CS in	Tol. ± ID / CS

Before you pick a size

Measure the ring you have

Full measuring guide

Cross-section firstCaliper the ring wall at 3–4 points without squeezing it, then average.
Then the inside diameterUse a cone gauge, or measure a relaxed ring lying flat on the table.
Match to a chart sizeUsed rings swell or take a set. Filter this chart by ID × CS and compare the nearest rows.

Size cross-referenceOne code in, the closest size in every system out. Don't know the size?Measure two dimensions; we find the closest standard size. Size finderPrices, packs and grades at an exact size. Groove designCheck squeeze and fill for a chosen size. Engineer ProPressure, extrusion and dynamic service.

Size chart questions

Reading an O-ring size chart

What do ID and CS mean on an O-ring size chart?

ID is the inside diameter, the hole through the ring. CS is the cross-section, the thickness of the ring wall. Those two numbers define an O-ring size. Every row here gives both in millimetres and in inches, as nominal values.

Is AS568-214 the same as a 25 × 3.5 mm O-ring?

They are close, but they are not the same part. AS568 sizes are inch sizes, so in millimetres they come out at odd values: -214 is 24.99 × 3.53 mm. A 25 × 3.5 mm ring falls within the reference tolerance of that size. Before you swap one for the other, check the difference against your groove. The size cross-reference shows the difference for any pair.

How exact are these tables?

We compiled them from public size references and checked each system against the others. They are not an official validation of any standard. Dimensions are nominal. The tolerance column shows reference values. AS568 values come from its tolerance table. Rows marked general use a general-purpose tolerance for that size range. Your drawing or the current edition of the standard always takes priority.

What do “N grades” and “Request” mean in the Catalog column?

“N grades” is how many material and hardness combinations we list at exactly that nominal size, for example NBR 70A or FKM 75A. Click it to compare packs and prices in the size finder. “Request” means we do not list that size yet. Send it for a quote; we make custom sizes to order.

Why do BS 1806 and AS568 look almost the same?

Both use the same inch size series. Most BS 1806 numbers have the same dimensions as the AS568 dash number with the same digits. The British table also has its own extra series, so check the number in the BS 1806 tab instead of assuming.

How are JIS B 2401 codes organised?

A JIS code is a series letter followed by a number, for example P22 or G25. P sizes are typically used for moving and static seals, G sizes for static face and flange seals, and V sizes for vacuum flanges. S and SS are small, thin sections. Each code stands for one ID × CS pair. Use the Series filter to show one family.

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O-ring size charts

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Reading an O-ring size chart

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