JIS B2401 O-Rings — P, G, S & V Series

JIS B2401 is the Japanese Industrial Standard for O-Rings, defining four separate series: P (general purpose dynamic/static), G (fixed/static applications), S (vacuum service) and V (vacuum, larger sizes). Japanese and Korean machinery, automotive OEMs and electronics equipment frequently reference JIS B2401 sizes. FITCO supplies all four series in NBR, FKM, EPDM and Silicone.

Series	CS Range	Application
P-Series	~1.9–8.4 mm CS	General purpose dynamic and static sealing
G-Series	~3.1–5.7 mm CS	Fixed/static groove sealing
S-Series	~1.5–2.0 mm CS	Vacuum system sealing — small cross-sections
V-Series	~4.0–10.0 mm CS	Vacuum system sealing — large cross-sections

JIS B2401 O-Rings use their own size designation system (e.g. P-22, G-45, S-8). Send your JIS size code and we will confirm the equivalent FITCO O-Ring with ID, CS and OD in millimetres.

Find Your O-Ring Size → Request a Quote →

Material Technical Guides

NBR FKM EPDM FFKM HNBR Silicone

Standards Cross-Reference

AS568 Metric ISO 3601 JIS B2401 Custom

Available Compounds

NBR 70/90FKM 75/90FFKM EPDMHNBR 70/80/90Silicone FluorosiliconeAFLASNeoprene

Complete Reference

Full JIS B2401 size chart — every size code

All 423 standard JIS B2401 O-Ring size codes (P, G, S and V series) across all 11 cross-section bands, with inside diameter and tolerance in millimetres.

Size Code	ID (mm)	ID Tol. (±)	CS (mm)
CS 1.5 mm
S3	2.50	0.13	1.5
S4	3.50	0.14	1.5
S5	4.50	0.14	1.5
S6	5.50	0.15	1.5
S7	6.50	0.15	1.5
S8	7.50	0.16	1.5
S9	8.50	0.16	1.5
S10	9.50	0.17	1.5
S11.2	10.70	0.18	1.5
S12	11.50	0.18	1.5
S12.5	12.00	0.19	1.5
S14	13.50	0.19	1.5
S15	14.50	0.19	1.5
S16	15.50	0.20	1.5
S18	17.50	0.21	1.5
S20	19.50	0.22	1.5
S22	21.50	0.23	1.5
CS 1.9 mm
P3	2.80	0.14	1.9
P4	3.80	0.14	1.9
P5	4.80	0.15	1.9
P6	5.80	0.15	1.9
P7	6.80	0.16	1.9
P8	7.80	0.16	1.9
P9	8.80	0.17	1.9
P10	9.80	0.17	1.9
CS 2.0 mm
S22.4	21.90	0.23	2.0
S24	23.50	0.24	2.0
S25	24.50	0.24	2.0
S26	25.50	0.25	2.0
S28	27.50	0.26	2.0
S29	28.50	0.28	2.0
S30	29.50	0.28	2.0
S31.5	31.00	0.29	2.0
S32	31.50	0.31	2.0
S34	33.50	0.32	2.0
S35	34.50	0.33	2.0
S35.5	35.00	0.33	2.0
S36	35.50	0.34	2.0
S38	37.50	0.36	2.0
S39	38.50	0.36	2.0
S40	39.50	0.38	2.0
S42	41.50	0.39	2.0
S44	43.50	0.40	2.0
S45	44.50	0.41	2.0
S46	45.50	0.42	2.0
S48	47.50	0.44	2.0
S50	49.50	0.45	2.0
S53	52.50	0.47	2.0
S55	54.50	0.50	2.0
S56	55.50	0.50	2.0
S60	59.50	0.52	2.0
S63	62.50	0.55	2.0
S65	64.50	0.56	2.0
S67	66.50	0.58	2.0
S70	69.50	0.61	2.0
S71	70.50	0.61	2.0
S75	74.50	0.64	2.0
S80	79.50	0.67	2.0
S85	84.50	0.71	2.0
S90	89.50	0.75	2.0
S95	94.50	0.79	2.0
S100	99.50	0.83	2.0
S105	104.50	0.87	2.0
S110	109.50	0.91	2.0
S112	111.50	0.91	2.0
S115	114.50	0.93	2.0
S120	119.50	0.97	2.0
S125	124.50	1.00	2.0
S130	129.50	1.05	2.0
S132	131.50	1.05	2.0
S135	134.50	1.08	2.0
S140	139.50	1.10	2.0
S145	144.50	1.13	2.0
S150	149.50	1.17	2.0
CS 2.4 mm
P10A	9.80	0.17	2.4
P11	10.80	0.18	2.4
P11.2	11.00	0.18	2.4
P12	11.80	0.19	2.4
P12.5	12.30	0.19	2.4
P13	12.80	0.19	2.4
P14	13.80	0.19	2.4
P15	14.80	0.20	2.4
P16	15.80	0.20	2.4
P17	16.80	0.21	2.4
P18	17.80	0.21	2.4
P19	18.80	0.21	2.4
P20	19.80	0.22	2.4
P21	20.80	0.23	2.4
P22	21.80	0.24	2.4
CS 3.1 mm
G20	19.40	0.22	3.1
G25	24.40	0.25	3.1
G30	29.40	0.29	3.1
G35	34.40	0.33	3.1
G40	39.40	0.37	3.1
G45	44.40	0.41	3.1
G50	49.40	0.45	3.1
G55	54.40	0.49	3.1
G58	57.40	0.51	3.1
G60	59.40	0.53	3.1
G65	64.40	0.57	3.1
G70	69.40	0.61	3.1
G75	74.40	0.65	3.1
G80	79.40	0.69	3.1
G85	84.40	0.73	3.1
G90	89.40	0.77	3.1
G95	94.40	0.81	3.1
G100	99.40	0.85	3.1
G105	104.40	0.87	3.1
G110	109.40	0.91	3.1
G115	114.40	0.94	3.1
G120	119.40	0.98	3.1
G125	124.40	1.01	3.1
G130	129.40	1.05	3.1
G135	134.40	1.08	3.1
G140	139.40	1.12	3.1
G145	144.40	1.16	3.1
CS 3.5 mm
P22A	21.70	0.24	3.5
P22.4	22.10	0.24	3.5
P24	23.70	0.24	3.5
P25	24.70	0.25	3.5
P25.5	25.20	0.25	3.5
P26	25.70	0.26	3.5
P28	27.70	0.28	3.5
P29	28.70	0.29	3.5
P29.5	29.20	0.29	3.5
P30	29.70	0.29	3.5
P31	30.70	0.30	3.5
P31.5	31.20	0.31	3.5
P32	31.70	0.31	3.5
P33	32.70	0.31	3.5
P34	33.70	0.33	3.5
P35	34.70	0.34	3.5
P35.5	35.20	0.34	3.5
P36	35.70	0.34	3.5
P38	37.70	0.37	3.5
P39	38.70	0.37	3.5
P40	39.70	0.37	3.5
P41	40.70	0.38	3.5
P42	41.70	0.39	3.5
P44	43.70	0.41	3.5
P45	44.70	0.41	3.5
P46	45.70	0.42	3.5
P48	47.70	0.44	3.5
P49	48.70	0.45	3.5
P50	49.70	0.45	3.5
CS 4.0 mm
V10	9.50	0.17	4.0
V15	14.50	0.20	4.0
V24	23.50	0.24	4.0
V34	33.50	0.33	4.0
V40	39.50	0.37	4.0
V55	54.50	0.49	4.0
V58	57.50	0.52	4.0
V70	69.00	0.61	4.0
V85	84.00	0.72	4.0
V100	99.00	0.83	4.0
V120	119.00	0.97	4.0
V140	138.50	1.08	4.0
V150	148.50	1.18	4.0
V175	173.00	1.36	4.0
CS 5.7 mm
P48A	47.60	0.44	5.7
P50A	49.60	0.45	5.7
P52	51.60	0.47	5.7
P53	52.60	0.48	5.7
P55	54.60	0.49	5.7
P56	55.60	0.50	5.7
P58	57.60	0.52	5.7
P60	59.60	0.53	5.7
P62	61.60	0.55	5.7
P63	62.60	0.56	5.7
P65	64.60	0.57	5.7
P67	66.60	0.59	5.7
P68	67.60	0.59	5.7
P70	69.60	0.61	5.7
P71	70.60	0.62	5.7
P75	74.60	0.65	5.7
P80	79.60	0.69	5.7
P85	84.60	0.73	5.7
P90	89.60	0.77	5.7
P95	94.60	0.81	5.7
P100	99.60	0.84	5.7
P102	101.60	0.85	5.7
P105	104.60	0.87	5.7
P110	109.60	0.91	5.7
P112	111.60	0.92	5.7
P115	114.60	0.94	5.7
P120	119.60	0.98	5.7
P125	124.60	1.01	5.7
P130	129.60	1.05	5.7
P132	131.60	1.06	5.7
P135	134.60	1.09	5.7
P140	139.60	1.12	5.7
P145	144.60	1.16	5.7
P150	149.60	1.19	5.7
G150	149.30	1.19	5.7
G155	154.30	1.23	5.7
G160	159.30	1.26	5.7
G165	164.30	1.30	5.7
G170	169.30	1.33	5.7
G175	174.30	1.37	5.7
G180	179.30	1.40	5.7
G185	184.30	1.44	5.7
G190	189.30	1.47	5.7
G195	194.30	1.51	5.7
G200	199.30	1.55	5.7
G205	204.30	1.58	5.7
G210	209.30	1.61	5.7
G215	214.30	1.65	5.7
G220	219.30	1.68	5.7
G225	224.30	1.71	5.7
G230	229.30	1.73	5.7
G235	234.30	1.78	5.7
G240	239.30	1.81	5.7
G245	244.30	1.85	5.7
G250	249.30	1.88	5.7
G255	254.30	1.91	5.7
G260	259.30	1.94	5.7
G265	264.30	1.98	5.7
G270	269.30	2.01	5.7
G275	274.30	2.04	5.7
G280	279.30	2.07	5.7
G285	284.30	2.11	5.7
G290	289.30	2.14	5.7
G295	294.30	2.17	5.7
G300	299.30	2.20	5.7
G305	304.30	2.24	5.7
G310	309.30	2.27	5.7
G315	314.30	2.30	5.7
G320	319.30	2.33	5.7
G325	324.30	2.36	5.7
G330	329.30	2.39	5.7
G335	334.30	2.42	5.7
G340	339.30	2.45	5.7
G345	344.30	2.48	5.7
G350	349.30	2.51	5.7
G355	354.30	2.54	5.7
G360	359.30	2.57	5.7
G365	364.30	2.60	5.7
G370	369.30	2.63	5.7
G375	374.30	2.67	5.7
G380	379.30	2.70	5.7
G385	384.30	2.73	5.7
G390	389.30	2.77	5.7
G395	394.30	2.79	5.7
G400	399.30	2.82	5.7
G405	404.30	3.00	5.7
G410	409.30	3.00	5.7
G415	414.30	3.00	5.7
G420	419.30	3.00	5.7
G425	424.30	3.00	5.7
G430	429.30	3.00	5.7
G435	434.30	3.00	5.7
G440	439.30	3.00	5.7
G445	444.30	3.00	5.7
G450	449.30	3.00	5.7
G455	454.30	3.30	5.7
G460	459.30	3.30	5.7
G465	464.30	3.30	5.7
G470	469.30	3.30	5.7
G475	474.30	3.30	5.7
G480	479.30	3.30	5.7
G485	484.30	3.30	5.7
G490	489.30	3.30	5.7
G495	494.30	3.30	5.7
G500	499.30	3.30	5.7
G510	509.30	3.30	5.7
G520	519.30	3.54	5.7
G525	524.30	3.56	5.7
G530	529.30	3.72	5.7
G535	534.30	3.72	5.7
G540	539.30	3.72	5.7
G545	544.30	3.72	5.7
G550	549.30	3.72	5.7
G555	554.30	3.75	5.7
G560	559.30	3.81	5.7
G570	569.30	3.81	5.7
G575	574.30	3.87	5.7
G580	579.30	3.90	5.7
G585	584.30	3.93	5.7
G590	589.30	3.97	5.7
G600	599.30	4.03	5.7
G605	604.30	4.06	5.7
G615	614.30	4.12	5.7
G620	619.30	4.15	5.7
G630	629.30	4.21	5.7
G860	859.30	5.63	5.7
G910	909.30	5.93	5.7
CS 6.0 mm
V225	222.50	1.70	6.0
V275	272.00	2.02	6.0
V315	312.00	2.22	6.0
V325	321.50	2.34	6.0
V380	376.00	2.68	6.0
V390	386.00	2.69	6.0
V430	425.50	2.99	6.0
V475	470.50	3.22	6.0
CS 8.4 mm
P150A	149.50	1.19	8.4
P155	154.50	1.23	8.4
P160	159.50	1.26	8.4
P165	164.50	1.30	8.4
P170	169.50	1.33	8.4
P175	174.50	1.37	8.4
P180	179.50	1.40	8.4
P185	184.50	1.44	8.4
P190	189.50	1.48	8.4
P195	194.50	1.51	8.4
P200	199.50	1.55	8.4
P205	204.50	1.58	8.4
P209	208.50	1.61	8.4
P210	209.50	1.62	8.4
P215	214.50	1.65	8.4
P220	219.50	1.68	8.4
P225	224.50	1.71	8.4
P230	229.50	1.75	8.4
P235	234.50	1.78	8.4
P240	239.50	1.81	8.4
P245	244.50	1.84	8.4
P250	249.50	1.88	8.4
P255	254.50	1.91	8.4
P260	259.50	1.94	8.4
P265	264.50	1.97	8.4
P270	269.50	2.01	8.4
P275	274.50	2.04	8.4
P280	279.50	2.07	8.4
P285	284.50	2.10	8.4
P290	289.50	2.14	8.4
P295	294.50	2.17	8.4
P300	299.50	2.20	8.4
P305	304.50	2.24	8.4
P310	309.50	2.27	8.4
P315	314.50	2.30	8.4
P320	319.50	2.33	8.4
P325	324.50	2.36	8.4
P330	329.50	2.39	8.4
P335	334.50	2.42	8.4
P340	339.50	2.45	8.4
P345	344.50	2.48	8.4
P350	349.50	2.51	8.4
P355	354.50	2.54	8.4
P360	359.50	2.57	8.4
P365	364.50	2.60	8.4
P370	369.50	2.63	8.4
P375	374.50	2.67	8.4
P380	379.50	2.70	8.4
P385	384.50	2.73	8.4
P390	389.50	2.77	8.4
P395	394.50	2.79	8.4
P400	399.50	2.82	8.4
P405	404.50	3.00	8.4
P410	409.50	3.00	8.4
P415	414.50	3.00	8.4
P420	419.50	3.00	8.4
P425	424.50	3.00	8.4
P430	429.50	3.00	8.4
P435	434.50	3.00	8.4
P440	439.50	3.00	8.4
P445	444.50	3.00	8.4
P450	449.50	3.00	8.4
P455	454.50	3.30	8.4
P460	459.50	3.30	8.4
P465	464.50	3.30	8.4
P470	469.50	3.30	8.4
P475	474.50	3.30	8.4
P480	479.50	3.30	8.4
P485	484.50	3.30	8.4
P490	489.50	3.30	8.4
P495	494.50	3.30	8.4
P500	499.50	3.30	8.4
P505	504.50	3.44	8.4
P540	539.50	3.66	8.4
P545	544.50	3.69	8.4
P590	589.50	3.97	8.4
P595	594.50	4.00	8.4
P600	599.50	4.03	8.4
P610	609.50	4.09	8.4
P620	619.50	4.15	8.4
P625	624.50	4.18	8.4
P635	634.50	4.25	8.4
P650	649.50	4.34	8.4
P680	679.50	4.52	8.4
P690	689.50	4.59	8.4
P700	699.50	4.65	8.4
P710	709.50	4.71	8.4
P720	719.50	4.77	8.4
P730	729.50	4.83	8.4
P740	739.50	4.89	8.4
P750	749.50	4.95	8.4
P760	759.50	5.02	8.4
P770	769.50	5.08	8.4
P780	779.50	5.14	8.4
P790	789.50	5.20	8.4
P800	799.50	5.26	8.4
P810	809.50	5.32	8.4
P820	819.50	5.38	8.4
P830	829.50	5.44	8.4
P840	839.50	5.51	8.4
P850	849.50	5.57	8.4
P860	859.50	5.63	8.4
P870	869.50	5.69	8.4
P880	879.50	5.75	8.4
P890	889.50	5.81	8.4
P900	899.50	5.87	8.4
P910	909.50	5.93	8.4
P915	914.50	5.96	8.4
P920	919.50	5.99	8.4
P930	929.50	6.05	8.4
P940	939.50	6.11	8.4
P950	949.50	6.18	8.4
P960	959.50	6.24	8.4
P970	969.50	6.30	8.4
P980	979.50	6.36	8.4
P990	989.50	6.42	8.4
P1000	999.50	6.48	8.4
CS 10.0 mm
V480	475.00	3.30	10.0
V490	485.00	3.31	10.0
V510	504.50	3.44	10.0
V530	524.50	3.60	10.0
V585	579.00	3.92	10.0
V640	633.50	4.24	10.0
V690	683.00	4.54	10.0
V740	732.50	4.83	10.0
V790	782.00	5.12	10.0
V845	836.50	5.44	10.0
V950	940.50	6.06	10.0
V1055	1044.00	6.67	10.0

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