Japanese Metric O-Rings (JIS) and Sizes

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The Japanese Industrial Standard (JIS B 2401) contains three groups; aerospace group, general purpose group, and traditional group. These o-ring sizes are unique to Japan’s automotive, semiconductor, and manufacturing industries.

JIS O-Ring Groups
Aerospace Group	367 sizes and follows ISO 3601-1 very closely (with a few extra sizes). Each size is designated by its dimension: ID × cross-section. Subsequent to the dimension, the letter “A” is appended to indicate use in aerospace applications.
General Purpose Group	Contains 445 sizes and matches ISO 3601-1 very closely (with a few extra sizes). Each size is designated by its dimension: ID × cross-section. Subsequent to the dimension, the letter “G” is appended to indicate use in general purpose applications.
Traditional Group	Contains 194 sizes Each size is designated by a letter followed by a nominal number. Letter indicates the intended application: “P” – dynamic; “G” – static; “V” – vacuum flange.

Listed below are size charts from the traditional group.

TRADITIONAL P SERIES (DYNAMIC)

Size	ID (mm)	+/-	C/S (W) (mm)	ID (inches)	+/-	C/S (W) (inches)	+/-
P-3	2.8	0.12	1.9	0.110	0.005	0.075	0.003
P-4	3.8	0.12	1.9	0.150	0.005	0.075	0.003
P-5	4.8	0.12	1.9	0.189	0.005	0.075	0.003
P-6	5.8	0.12	1.9	0.228	0.005	0.075	0.003
P-7	6.8	0.12	1.9	0.268	0.005	0.075	0.003
P-8	7.8	0.12	1.9	0.307	0.005	0.075	0.003
P-9	8.8	0.12	1.9	0.346	0.005	0.075	0.003
P-10	9.8	0.12	1.9	0.386	0.005	0.075	0.003
P-10A	9.8	0.12	2.4	0.386	0.005	0.094	0.003
P-11	10.8	0.12	2.4	0.425	0.005	0.094	0.003
P-11.2	11.0	0.12	2.4	0.433	0.005	0.094	0.003
P-12	11.8	0.12	2.4	0.465	0.005	0.094	0.003
P-12.5	12.3	0.12	2.4	0.484	0.005	0.094	0.003
P-14	13.8	0.12	2.4	0.543	0.005	0.094	0.003
P-15	14.8	0.12	2.4	0.583	0.005	0.094	0.003
P-16	15.8	0.12	2.4	0.622	0.005	0.094	0.003
P-18	17.8	0.12	2.4	0.701	0.005	0.094	0.003
P-20	19.8	0.15	2.4	0.780	0.006	0.094	0.003
P-21	20.8	0.15	2.4	0.819	0.006	0.094	0.003
P-22	21.8	0.15	2.4	0.858	0.006	0.094	0.003
P-22A	21.7	0.15	3.5	0.854	0.006	0.138	0.004
P-22.4	22.1	0.15	3.5	0.870	0.006	0.138	0.004
P-24	23.7	0.15	3.5	0.933	0.006	0.138	0.004
P-25	24.7	0.15	3.5	0.972	0.006	0.138	0.004
P-25.5	25.2	0.15	3.5	0.992	0.006	0.138	0.004
P-26	25.7	0.15	3.5	1.012	0.006	0.138	0.004
P-28	27.7	0.15	3.5	1.091	0.006	0.138	0.004
P-29	28.7	0.15	3.5	1.130	0.006	0.138	0.004
P-29.5	29.2	0.15	3.5	1.150	0.006	0.138	0.004
P-30	29.7	0.15	3.5	1.169	0.006	0.138	0.004
P-31	30.7	0.15	3.5	1.209	0.006	0.138	0.004
P-31.5	31.2	0.15	3.5	1.228	0.006	0.138	0.004
P-32	31.7	0.15	3.5	1.248	0.006	0.138	0.004
P-34	33.7	0.15	3.5	1.327	0.006	0.138	0.004
P-35	34.7	0.15	3.5	1.366	0.006	0.138	0.004
P-35.5	35.2	0.15	3.5	1.386	0.006	0.138	0.004
P-36	35.7	0.15	3.5	1.406	0.006	0.138	0.004
P-38	37.7	0.15	3.5	1.484	0.006	0.138	0.004
P-39	38.7	0.15	3.5	1.524	0.006	0.138	0.004
P-40	39.7	0.15	3.5	1.563	0.006	0.138	0.004
P-41	40.7	0.25	3.5	1.602	0.010	0.138	0.004
P-42	41.7	0.25	3.5	1.642	0.010	0.138	0.004
P-44	43.7	0.25	3.5	1.720	0.010	0.138	0.004
P-45	44.7	0.25	3.5	1.760	0.010	0.138	0.004
P-46	45.7	0.25	3.5	1.799	0.010	0.138	0.004
P-48	47.7	0.25	3.5	1.878	0.010	0.138	0.004
P-49	48.7	0.25	3.5	1.917	0.010	0.138	0.004
P-50	49.7	0.25	3.5	1.957	0.010	0.138	0.004
P-48A	47.6	0.25	5.7	1.874	0.010	0.224	0.006
P-50A	49.6	0.25	5.7	1.953	0.010	0.224	0.006
P-52	51.6	0.25	5.7	2.031	0.010	0.224	0.006
P-53	52.6	0.25	5.7	2.071	0.010	0.224	0.006
P-55	54.6	0.25	5.7	2.150	0.010	0.224	0.006
P-56	55.6	0.25	5.7	2.189	0.010	0.224	0.006
P-58	57.6	0.25	5.7	2.268	0.010	0.224	0.006
P-60	59.6	0.25	5.7	2.346	0.010	0.224	0.006
P-62	61.6	0.25	5.7	2.425	0.010	0.224	0.006
P-63	62.6	0.25	5.7	2.465	0.010	0.224	0.006
P-65	64.6	0.25	5.7	2.543	0.010	0.224	0.006
P-67	66.6	0.25	5.7	2.622	0.010	0.224	0.006
P-70	69.6	0.25	5.7	2.740	0.010	0.224	0.006
P-71	70.6	0.40	5.7	2.780	0.016	0.224	0.006
P-75	74.6	0.40	5.7	2.937	0.016	0.224	0.006
P-80	79.6	0.40	5.7	3.134	0.016	0.224	0.006
P-85	84.6	0.40	5.7	3.331	0.016	0.224	0.006
P-90	89.6	0.40	5.7	3.528	0.016	0.224	0.006
P-95	94.6	0.40	5.7	3.724	0.016	0.224	0.006
P-100	99.6	0.40	5.7	3.921	0.016	0.224	0.006
P-102	101.6	0.40	5.7	4.000	0.016	0.224	0.006
P-105	104.6	0.40	5.7	4.118	0.016	0.224	0.006
P-110	109.6	0.40	5.7	4.315	0.016	0.224	0.006
P-112	111.6	0.40	5.7	4.394	0.016	0.224	0.006
P-115	114.6	0.40	5.7	4.512	0.016	0.224	0.006
P-120	119.6	0.40	5.7	4.709	0.016	0.224	0.006
P-125	124.6	0.40	5.7	4.906	0.016	0.224	0.006
P-130	129.6	0.60	5.7	5.102	0.024	0.224	0.006
P-132	131.6	0.60	5.7	5.181	0.024	0.224	0.006
P-135	134.6	0.60	5.7	5.299	0.024	0.224	0.006
P-140	139.6	0.60	5.7	5.496	0.024	0.224	0.006
P-145	144.6	0.60	5.7	5.693	0.024	0.224	0.006
P-150	149.6	0.60	5.7	5.890	0.024	0.224	0.006
P-150A	149.5	0.60	8.4	5.886	0.024	0.331	0.006
P-155	154.5	0.60	8.4	6.083	0.024	0.331	0.006
P-160	159.5	0.60	8.4	6.280	0.024	0.331	0.006
P-165	164.5	0.60	8.4	6.476	0.024	0.331	0.006
P-170	169.5	0.60	8.4	6.673	0.024	0.331	0.006
P-175	174.5	0.60	8.4	6.870	0.024	0.331	0.006
P-180	179.5	0.60	8.4	7.067	0.024	0.331	0.006
P-185	184.5	0.80	8.4	7.264	0.031	0.331	0.006
P-190	189.5	0.80	8.4	7.461	0.031	0.331	0.006
P-195	194.5	0.80	8.4	7.657	0.031	0.331	0.006
P-200	199.5	0.80	8.4	7.854	0.031	0.331	0.006
P-205	204.5	0.80	8.4	8.051	0.031	0.331	0.006
P-209	208.5	0.80	8.4	8.209	0.031	0.331	0.006
P-210	209.5	0.80	8.4	8.248	0.031	0.331	0.006
P-215	214.5	0.80	8.4	8.445	0.031	0.331	0.006
P-220	219.5	0.80	8.4	8.642	0.031	0.331	0.006
P-225	224.5	0.80	8.4	8.839	0.031	0.331	0.006
P-230	229.5	0.80	8.4	9.035	0.031	0.331	0.006
P-235	234.5	0.80	8.4	9.232	0.031	0.331	0.006
P-240	239.5	0.80	8.4	9.429	0.031	0.331	0.006
P-245	244.5	0.80	8.4	9.626	0.031	0.331	0.006
P-250	249.5	0.80	8.4	9.823	0.031	0.331	0.006
P-255	254.5	0.80	8.4	10.020	0.031	0.331	0.006
P-260	259.5	0.80	8.4	10.217	0.031	0.331	0.006
P-265	264.5	0.80	8.4	10.413	0.031	0.331	0.006
P-270	269.5	0.80	8.4	10.610	0.031	0.331	0.006
P-275	274.5	0.80	8.4	10.807	0.031	0.331	0.006
P-280	279.5	0.80	8.4	11.004	0.031	0.331	0.006
P-285	284.5	0.80	8.4	11.201	0.031	0.331	0.006
P-290	289.5	0.80	8.4	11.398	0.031	0.331	0.006
P-295	294.5	0.80	8.4	11.594	0.031	0.331	0.006
P-300	299.5	0.80	8.4	11.791	0.031	0.331	0.006
P-315	314.5	1.00	8.4	12.382	0.039	0.331	0.006
P-320	319.5	1.00	8.4	12.579	0.039	0.331	0.006
P-335	334.5	1.00	8.4	13.169	0.039	0.331	0.006
P-340	339.5	1.00	8.4	13.366	0.039	0.331	0.006
P-355	354.5	1.00	8.4	13.957	0.039	0.331	0.006
P-360	359.5	1.00	8.4	14.154	0.039	0.331	0.006
P-375	374.5	1.00	8.4	14.744	0.039	0.331	0.006
P-385	384.5	1.00	8.4	15.138	0.039	0.331	0.006
P-400	399.5	1.00	8.4	15.728	0.039	0.331	0.006

TRADITIONAL G SERIES (STATIC)

Size	ID (mm)	+/-	C/S (W) (mm)	ID (inches)	+/-	C/S (W) (inches)	+/-
G-25	24.4	0.15	3.1	0.961	0.006	0.122	0.004
G-30	29.4	0.15	3.1	1.157	0.006	0.122	0.004
G-35	34.4	0.15	3.1	1.354	0.006	0.122	0.004
G-40	39.4	0.15	3.1	1.551	0.006	0.122	0.004
G-45	44.4	0.25	3.1	1.748	0.010	0.122	0.004
G-50	49.4	0.25	3.1	1.945	0.010	0.122	0.004
G-55	54.4	0.25	3.1	2.142	0.010	0.122	0.004
G-60	59.4	0.25	3.1	2.339	0.010	0.122	0.004
G-65	64.4	0.25	3.1	2.535	0.010	0.122	0.004
G-70	69.4	0.25	3.1	2.732	0.010	0.122	0.004
G-75	74.4	0.40	3.1	2.929	0.016	0.122	0.004
G-80	79.4	0.40	3.1	3.126	0.016	0.122	0.004
G-85	84.4	0.40	3.1	3.323	0.016	0.122	0.004
G-90	89.4	0.40	3.1	3.520	0.016	0.122	0.004
G-95	94.4	0.40	3.1	3.717	0.016	0.122	0.004
G-100	99.4	0.40	3.1	3.913	0.016	0.122	0.004
G-105	104.4	0.40	3.1	4.110	0.016	0.122	0.004
G-110	109.4	0.40	3.1	4.307	0.016	0.122	0.004
G-115	114.4	0.40	3.1	4.504	0.016	0.122	0.004
G-120	119.4	0.40	3.1	4.701	0.016	0.122	0.004
G-125	124.4	0.40	3.1	4.898	0.016	0.122	0.004
G-130	129.4	0.60	3.1	5.094	0.024	0.122	0.004
G-135	134.4	0.60	3.1	5.291	0.024	0.122	0.004
G-140	139.4	0.60	3.1	5.488	0.024	0.122	0.004
G-145	144.4	0.60	3.1	5.685	0.024	0.122	0.004
G-150	149.3	0.60	5.7	5.878	0.024	0.224	0.006
G-155	154.3	0.60	5.7	6.075	0.024	0.224	0.006
G-160	159.3	0.60	5.7	6.272	0.024	0.224	0.006
G-165	164.3	0.60	5.7	6.469	0.024	0.224	0.006
G-170	169.3	0.60	5.7	6.665	0.024	0.224	0.006
G-175	174.3	0.60	5.7	6.862	0.024	0.224	0.006
G-180	179.3	0.60	5.7	7.059	0.024	0.224	0.006
G-185	184.3	0.80	5.7	7.256	0.031	0.224	0.006
G-190	189.3	0.80	5.7	7.453	0.031	0.224	0.006
G-195	194.3	0.80	5.7	7.650	0.031	0.224	0.006
G-200	199.3	0.80	5.7	7.846	0.031	0.224	0.006
G-210	209.3	0.80	5.7	8.240	0.031	0.224	0.006
G-220	219.3	0.80	5.7	8.634	0.031	0.224	0.006
G-230	229.3	0.80	5.7	9.028	0.031	0.224	0.006
G-240	239.3	0.80	5.7	9.421	0.031	0.224	0.006
G-250	249.3	0.80	5.7	9.815	0.031	0.224	0.006
G-255	254.3	0.80	5.7	10.012	0.031	0.224	0.006
G-260	259.3	0.80	5.7	10.209	0.031	0.224	0.006
G-270	269.3	0.80	5.7	10.602	0.031	0.224	0.006
G-280	279.3	0.80	5.7	10.996	0.031	0.224	0.006
G-290	289.3	0.80	5.7	11.390	0.031	0.224	0.006
G-300	299.3	0.80	5.7	11.783	0.031	0.224	0.006

TRADITIONAL V SERIES (VACUUM)

Size	ID (mm)	+/-	C/S (W) (mm)	ID (inches)	+/-	C/S (W) (inches)	+/-
V-15	14.5	0.15	4.0	0.571	0.006	0.157	0.004
V-24	23.5	0.15	4.0	0.925	0.006	0.157	0.004
V-34	33.5	0.15	4.0	1.319	0.006	0.157	0.004
V-40	39.5	0.15	4.0	1.555	0.006	0.157	0.004
V-55	54.5	0.25	4.0	2.146	0.010	0.157	0.004
V-70	69.0	0.25	4.0	2.717	0.010	0.157	0.004
V-85	84.0	0.40	4.0	3.307	0.016	0.157	0.004
V-100	99.0	0.40	4.0	3.898	0.016	0.157	0.004
V-120	119.0	0.40	4.0	4.685	0.016	0.157	0.004
V-150	148.5	0.60	4.0	5.846	0.024	0.157	0.004
V-175	173.0	0.60	4.0	6.811	0.024	0.157	0.004
V-225	222.5	0.80	6.0	8.760	0.031	0.236	0.006
V-275	272.0	0.80	6.0	10.709	0.031	0.236	0.006
V-325	321.5	1.00	6.0	12.657	0.039	0.236	0.006
V-380	376.0	1.00	6.0	14.803	0.039	0.236	0.006
V-430	425.5	1.20	6.0	16.752	0.047	0.236	0.006
V-480	475.0	1.20	10.0	18.701	0.047	0.394	0.012
V-530	524.5	1.60	10.0	20.650	0.063	0.394	0.012
V-585	579.0	1.60	10.0	22.795	0.063	0.394	0.012
V-640	633.5	1.60	10.0	24.941	0.063	0.394	0.012
V-690	683.0	1.60	10.0	26.890	0.063	0.394	0.012
V-740	732.5	2.00	10.0	28.839	0.079	0.394	0.012
V-790	782.0	2.00	10.0	30.787	0.079	0.394	0.012
V-845	836.5	2.00	10.0	32.933	0.079	0.394	0.012
V-950	940.5	2.50	10.0	37.028	0.098	0.394	0.012
V-1055	1044.0	3.00	10.0	41.102	0.118	0.394	0.012

TRADITIONAL S SERIES

Size	ID (mm)	+/-	C/S (W) (mm)	ID (inches)	+/-	C/S (W) (inches)	+/-
S-3	2.5	0.15	1.5	0.098	0.006	0.059	0.004
S-4	3.5	0.15	1.5	0.138	0.006	0.059	0.004
S-5	4.5	0.15	1.5	0.177	0.006	0.059	0.004
S-6	5.5	0.15	1.5	0.217	0.006	0.059	0.004
S-7	6.5	0.15	1.5	0.256	0.006	0.059	0.004
S-8	7.5	0.15	1.5	0.295	0.006	0.059	0.004
S-9	8.5	0.15	1.5	0.335	0.006	0.059	0.004
S-10	9.5	0.15	1.5	0.374	0.006	0.059	0.004
S-11.2	10.7	0.15	1.5	0.421	0.006	0.059	0.004
S-12	11.5	0.15	1.5	0.453	0.006	0.059	0.004
S-12.5	12.0	0.15	1.5	0.472	0.006	0.059	0.004
S-14	13.5	0.15	1.5	0.531	0.006	0.059	0.004
S-15	14.5	0.15	1.5	0.571	0.006	0.059	0.004
S-16	15.5	0.15	1.5	0.610	0.006	0.059	0.004
S-18	17.5	0.15	1.5	0.689	0.006	0.059	0.004
S-20	19.5	0.15	1.5	0.768	0.006	0.059	0.004
S-22	21.5	0.15	1.5	0.846	0.006	0.059	0.004
S-22.4	21.9	0.15	2.0	0.862	0.006	0.079	0.004
S-24	23.5	0.15	2.0	0.925	0.006	0.079	0.004
S-25	24.5	0.15	2.0	0.965	0.006	0.079	0.004
S-26	25.5	0.15	2.0	1.004	0.006	0.079	0.004
S-28	27.5	0.15	2.0	1.083	0.006	0.079	0.004
S-29	28.5	0.15	2.0	1.122	0.006	0.079	0.004
S-30	29.5	0.15	2.0	1.161	0.006	0.079	0.004
S-31.5	31.0	0.15	2.0	1.220	0.006	0.079	0.004
S-32	31.5	0.15	2.0	1.240	0.006	0.079	0.004
S-34	33.5	0.15	2.0	1.319	0.006	0.079	0.004
S-35	34.5	0.15	2.0	1.358	0.006	0.079	0.004
S-35.5	35.0	0.15	2.0	1.378	0.006	0.079	0.004
S-36	35.5	0.15	2.0	1.398	0.006	0.079	0.004
S-38	37.5	0.15	2.0	1.476	0.006	0.079	0.004
S-39	38.5	0.15	2.0	1.516	0.006	0.079	0.004
S-40	39.5	0.15	2.0	1.555	0.006	0.079	0.004
S-42	41.5	0.25	2.0	1.634	0.010	0.079	0.004
S-44	43.5	0.25	2.0	1.713	0.010	0.079	0.004
S-45	44.5	0.25	2.0	1.752	0.010	0.079	0.004
S-46	45.5	0.25	2.0	1.791	0.010	0.079	0.004
S-48	47.5	0.25	2.0	1.870	0.010	0.079	0.004
S-50	49.5	0.25	2.0	1.949	0.010	0.079	0.004
S-53	52.5	0.25	2.0	2.067	0.010	0.079	0.004
S-55	54.5	0.25	2.0	2.146	0.010	0.079	0.004
S-56	55.5	0.25	2.0	2.185	0.010	0.079	0.004
S-60	59.5	0.25	2.0	2.343	0.010	0.079	0.004
S-63	62.5	0.25	2.0	2.461	0.010	0.079	0.004
S-65	64.5	0.25	2.0	2.539	0.010	0.079	0.004
S-67	66.5	0.25	2.0	2.618	0.010	0.079	0.004
S-70	69.5	0.25	2.0	2.736	0.010	0.079	0.004
S-71	70.5	0.40	2.0	2.776	0.016	0.079	0.004
S-75	74.5	0.40	2.0	2.933	0.016	0.079	0.004
S-80	79.5	0.40	2.0	3.130	0.016	0.079	0.004
S-85	84.5	0.40	2.0	3.327	0.016	0.079	0.004
S-90	89.5	0.40	2.0	3.524	0.016	0.079	0.004
S-95	94.5	0.40	2.0	3.720	0.016	0.079	0.004
S-100	99.5	0.40	2.0	3.917	0.016	0.079	0.004
S-105	104.5	0.40	2.0	4.114	0.016	0.079	0.004
S-110	109.5	0.40	2.0	4.311	0.016	0.079	0.004
S-112	111.5	0.40	2.0	4.390	0.016	0.079	0.004
S-115	114.5	0.40	2.0	4.508	0.016	0.079	0.004
S-120	119.5	0.40	2.0	4.705	0.016	0.079	0.004
S-125	124.5	0.40	2.0	4.902	0.016	0.079	0.004
S-130	129.5	0.60	2.0	5.098	0.024	0.079	0.004
S-132	131.5	0.60	2.0	5.177	0.024	0.079	0.004
S-135	134.5	0.60	2.0	5.295	0.024	0.079	0.004
S-140	139.5	0.60	2.0	5.492	0.024	0.079	0.004
S-145	144.5	0.60	2.0	5.689	0.024	0.079	0.004
S-150	149.5	0.60	2.0	5.886	0.024	0.079	0.004

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