AS568 O-Rings — Full Imperial Standard Range

The AS568 standard (published by the Society of Automotive Engineers) defines O-Ring sizes by a dash number system running from -001 to -475 across five cross-section bands. Every dash number specifies an Inside Diameter (ID) and Cross-Section (CS) in imperial inches. FITCO manufactures the complete AS568 range in all major elastomer compounds — NBR, FKM, FFKM, EPDM, HNBR, Silicone, AFLAS and more.

Series	CS	ID Range
-001 to -050	1.78 mm (0.070")	1.42–50.39 mm
-102 to -178	2.62 mm (0.103")	1.42–75.79 mm
-201 to -284	3.53 mm (0.139")	6.02–202.08 mm
-309 to -395	5.33 mm (0.210")	18.64–660.32 mm
-425 to -475	6.99 mm (0.275")	101.27–658.88 mm

AS568 is the dominant standard in the United States and widely used globally in oil & gas, aerospace and industrial equipment. If your drawing shows a dash number (e.g. -214, -312), it is AS568.

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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 AS568 size chart — every dash number

All 400 standard AS568 dash numbers across all 17 cross-section bands, with inside diameter and tolerance in millimetres.

Dash No.	ID (mm)	ID Tol. (±)	CS (mm)
CS 1.02 mm
A0001	0.74	0.10	1.02
CS 1.27 mm
A0002	1.07	0.10	1.27
CS 1.42 mm
A0901	4.70	0.13	1.42
CS 1.52 mm
A0003	1.42	0.10	1.52
CS 1.63 mm
A0902	6.07	0.13	1.63
A0903	7.65	0.13	1.63
CS 1.78 mm
A0004	1.78	0.13	1.78
A0005	2.57	0.13	1.78
A0006	2.90	0.13	1.78
A0007	3.68	0.13	1.78
A0008	4.47	0.13	1.78
A0009	5.28	0.13	1.78
A0010	6.07	0.13	1.78
A0011	7.65	0.13	1.78
A0012	9.25	0.13	1.78
A0013	10.82	0.13	1.78
A0014	12.42	0.13	1.78
A0015	14.00	0.18	1.78
A0016	15.60	0.23	1.78
A0017	17.17	0.23	1.78
A0018	18.77	0.23	1.78
A0019	20.35	0.23	1.78
A0020	21.95	0.23	1.78
A0021	23.52	0.23	1.78
A0022	25.12	0.25	1.78
A0023	26.70	0.25	1.78
A0024	28.30	0.25	1.78
A0025	29.87	0.28	1.78
A0026	31.47	0.28	1.78
A0027	33.05	0.28	1.78
A0028	34.65	0.33	1.78
A0029	37.82	0.33	1.78
A0030	41.00	0.33	1.78
A0031	44.17	0.38	1.78
A0032	47.35	0.38	1.78
A0033	50.52	0.46	1.78
A0034	53.70	0.46	1.78
A0035	56.87	0.46	1.78
A0036	60.05	0.46	1.78
A0037	63.22	0.46	1.78
A0038	66.40	0.51	1.78
A0039	69.57	0.51	1.78
A0040	72.75	0.51	1.78
A0041	75.92	0.61	1.78
A0042	82.27	0.61	1.78
A0043	88.62	0.61	1.78
A0044	94.97	0.69	1.78
A0045	101.32	0.69	1.78
A0046	107.67	0.76	1.78
A0047	114.02	0.76	1.78
A0048	120.37	0.76	1.78
A0049	126.72	0.94	1.78
A0050	133.07	0.94	1.78
A0051	139.42	0.94	1.78
A0052	145.77	0.94	1.78
A0053	152.12	0.94	1.78
A0054	158.47	1.02	1.78
A0055	164.82	1.02	1.78
CS 1.83 mm
A0904	8.92	0.13	1.83
A0905	10.52	0.13	1.83
CS 1.98 mm
A0906	11.89	0.13	1.98
CS 2.08 mm
A0907	13.46	0.18	2.08
CS 2.21 mm
A0908	16.36	0.23	2.21
CS 2.46 mm
A0909	17.93	0.23	2.46
A0910	19.18	0.23	2.46
CS 2.62 mm
A0102	1.24	0.13	2.62
A0103	2.06	0.13	2.62
A0104	2.84	0.13	2.62
A0105	3.63	0.13	2.62
A0106	4.42	0.13	2.62
A0107	5.23	0.13	2.62
A0108	6.02	0.13	2.62
A0109	7.59	0.13	2.62
A0110	9.19	0.13	2.62
A0111	10.77	0.13	2.62
A0112	12.37	0.13	2.62
A0113	13.94	0.18	2.62
A0114	15.54	0.23	2.62
A0115	17.12	0.23	2.62
A0116	18.72	0.23	2.62
A0117	20.29	0.25	2.62
A0118	21.89	0.25	2.62
A0119	23.47	0.25	2.62
A0120	25.07	0.25	2.62
A0121	26.64	0.25	2.62
A0122	28.24	0.25	2.62
A0123	29.82	0.30	2.62
A0124	31.42	0.30	2.62
A0125	32.99	0.30	2.62
A0126	34.59	0.30	2.62
A0127	36.17	0.30	2.62
A0128	37.77	0.30	2.62
A0129	39.34	0.38	2.62
A0130	40.94	0.38	2.62
A0131	42.52	0.38	2.62
A0132	44.12	0.38	2.62
A0133	45.69	0.38	2.62
A0134	47.29	0.38	2.62
A0135	48.90	0.43	2.62
A0136	50.47	0.43	2.62
A0137	52.07	0.43	2.62
A0138	53.64	0.43	2.62
A0139	55.25	0.43	2.62
A0140	56.82	0.43	2.62
A0141	58.42	0.51	2.62
A0142	59.99	0.51	2.62
A0143	61.60	0.51	2.62
A0144	63.17	0.51	2.62
A0145	64.77	0.51	2.62
A0146	66.34	0.51	2.62
A0147	67.95	0.56	2.62
A0148	69.52	0.56	2.62
A0149	71.12	0.56	2.62
A0150	72.69	0.56	2.62
A0151	75.87	0.61	2.62
A0152	82.22	0.61	2.62
A0153	88.57	0.61	2.62
A0154	94.92	0.71	2.62
A0155	101.27	0.71	2.62
A0156	107.62	0.76	2.62
A0157	113.97	0.76	2.62
A0158	120.32	0.76	2.62
A0159	126.67	0.89	2.62
A0160	133.02	0.89	2.62
A0161	139.37	0.89	2.62
A0162	145.72	0.89	2.62
A0163	152.07	0.89	2.62
A0164	158.42	1.02	2.62
A0165	164.77	1.02	2.62
A0166	171.12	1.02	2.62
A0167	177.47	1.02	2.62
A0168	183.82	1.14	2.62
A0169	190.17	1.14	2.62
A0170	196.52	1.14	2.62
A0171	202.87	1.14	2.62
A0172	209.22	1.27	2.62
A0173	215.57	1.27	2.62
A0174	221.92	1.27	2.62
A0175	228.27	1.27	2.62
A0176	234.62	1.40	2.62
A0177	240.97	1.40	2.62
A0178	247.32	1.40	2.62
A0179	253.67	1.40	2.62
CS 2.95 mm
A0911	21.92	0.23	2.95
A0912	23.47	0.23	2.95
A0913	25.04	0.25	2.95
A0914	26.59	0.25	2.95
A0916	29.74	0.25	2.95
A0918	34.42	0.30	2.95
CS 3.0 mm
A0920	37.47	0.36	3.0
A0924	43.69	0.36	3.0
A0928	53.09	0.46	3.0
A0932	59.36	0.46	3.0
CS 3.53 mm
A0201	4.34	0.13	3.53
A0202	5.94	0.13	3.53
A0203	7.52	0.13	3.53
A0204	9.12	0.13	3.53
A0205	10.69	0.13	3.53
A0206	12.29	0.13	3.53
A0207	13.87	0.18	3.53
A0208	15.47	0.23	3.53
A0209	17.04	0.23	3.53
A0210	18.64	0.25	3.53
A0211	20.22	0.25	3.53
A0212	21.82	0.25	3.53
A0213	23.39	0.25	3.53
A0214	24.99	0.25	3.53
A0215	26.57	0.25	3.53
A0216	28.17	0.30	3.53
A0217	29.74	0.30	3.53
A0218	31.34	0.30	3.53
A0219	32.92	0.30	3.53
A0220	34.52	0.30	3.53
A0221	36.09	0.30	3.53
A0222	37.69	0.38	3.53
A0223	40.87	0.38	3.53
A0224	44.04	0.38	3.53
A0225	47.22	0.46	3.53
A0226	50.39	0.46	3.53
A0227	53.57	0.46	3.53
A0228	56.74	0.51	3.53
A0229	59.92	0.51	3.53
A0230	63.09	0.51	3.53
A0231	66.27	0.51	3.53
A0232	69.44	0.61	3.53
A0233	72.62	0.61	3.53
A0234	75.79	0.61	3.53
A0235	78.97	0.61	3.53
A0236	82.14	0.61	3.53
A0237	85.32	0.61	3.53
A0238	88.49	0.61	3.53
A0239	91.67	0.71	3.53
A0240	94.84	0.71	3.53
A0241	98.02	0.71	3.53
A0242	101.19	0.71	3.53
A0243	104.37	0.71	3.53
A0244	107.54	0.76	3.53
A0245	110.72	0.76	3.53
A0246	113.89	0.76	3.53
A0247	117.07	0.76	3.53
A0248	120.24	0.76	3.53
A0249	123.42	0.89	3.53
A0250	126.59	0.89	3.53
A0251	129.77	0.89	3.53
A0252	132.94	0.89	3.53
A0253	136.12	0.89	3.53
A0254	139.29	0.89	3.53
A0255	142.47	0.89	3.53
A0256	145.64	0.89	3.53
A0257	148.82	0.89	3.53
A0258	151.99	0.89	3.53
A0259	158.34	1.02	3.53
A0260	164.69	1.02	3.53
A0261	171.04	1.02	3.53
A0262	177.39	1.02	3.53
A0263	183.74	1.14	3.53
A0264	190.09	1.14	3.53
A0265	196.44	1.14	3.53
A0266	202.79	1.14	3.53
A0267	209.14	1.27	3.53
A0268	215.49	1.27	3.53
A0269	221.84	1.27	3.53
A0270	228.19	1.27	3.53
A0271	234.54	1.40	3.53
A0272	240.89	1.40	3.53
A0273	247.24	1.40	3.53
A0274	253.59	1.40	3.53
A0275	266.29	1.40	3.53
A0276	278.99	1.65	3.53
A0277	291.69	1.65	3.53
A0278	304.39	1.65	3.53
A0279	329.79	1.65	3.53
A0280	355.19	1.65	3.53
A0281	380.59	1.65	3.53
A0282	405.26	1.91	3.53
A0283	430.66	2.03	3.53
A0284	456.06	2.16	3.53
CS 5.33 mm
A0309	10.46	0.13	5.33
A0310	12.07	0.13	5.33
A0311	13.64	0.18	5.33
A0312	15.24	0.23	5.33
A0313	16.81	0.23	5.33
A0314	18.42	0.25	5.33
A0315	19.99	0.25	5.33
A0316	21.59	0.25	5.33
A0317	23.16	0.25	5.33
A0318	24.77	0.25	5.33
A0319	26.34	0.25	5.33
A0320	27.94	0.30	5.33
A0321	29.51	0.30	5.33
A0322	31.12	0.30	5.33
A0323	32.69	0.30	5.33
A0324	34.29	0.30	5.33
A0325	37.47	0.38	5.33
A0326	40.64	0.38	5.33
A0327	43.82	0.38	5.33
A0328	46.99	0.38	5.33
A0329	50.17	0.46	5.33
A0330	53.34	0.46	5.33
A0331	56.52	0.46	5.33
A0332	59.69	0.46	5.33
A0333	62.87	0.51	5.33
A0334	66.04	0.51	5.33
A0335	69.22	0.51	5.33
A0336	72.39	0.51	5.33
A0337	75.57	0.61	5.33
A0338	78.74	0.61	5.33
A0339	81.92	0.61	5.33
A0340	85.09	0.61	5.33
A0341	88.27	0.61	5.33
A0342	91.44	0.71	5.33
A0343	94.62	0.71	5.33
A0344	97.79	0.71	5.33
A0345	100.97	0.71	5.33
A0346	104.14	0.71	5.33
A0347	107.32	0.76	5.33
A0348	110.49	0.76	5.33
A0349	113.67	0.76	5.33
A0350	116.84	0.76	5.33
A0351	120.02	0.76	5.33
A0352	123.19	0.76	5.33
A0353	126.37	0.94	5.33
A0354	129.54	0.94	5.33
A0355	132.72	0.94	5.33
A0356	135.89	0.94	5.33
A0357	139.07	0.94	5.33
A0358	142.24	0.94	5.33
A0359	145.42	0.94	5.33
A0360	148.59	0.94	5.33
A0361	151.77	0.94	5.33
A0362	158.12	1.02	5.33
A0363	164.47	1.02	5.33
A0364	170.82	1.02	5.33
A0365	177.17	1.02	5.33
A0366	183.52	1.14	5.33
A0367	189.87	1.14	5.33
A0368	196.22	1.14	5.33
A0369	202.57	1.14	5.33
A0370	208.92	1.27	5.33
A0371	215.27	1.27	5.33
A0372	221.62	1.27	5.33
A0373	227.97	1.27	5.33
A0374	234.32	1.40	5.33
A0375	240.67	1.40	5.33
A0376	247.02	1.40	5.33
A0377	253.37	1.40	5.33
A0378	266.07	1.52	5.33
A0379	278.77	1.52	5.33
A0380	291.47	1.65	5.33
A0381	304.17	1.65	5.33
A0382	329.57	1.65	5.33
A0383	354.97	1.78	5.33
A0384	380.37	1.78	5.33
A0385	405.26	1.91	5.33
A0386	430.66	2.03	5.33
A0387	456.06	2.16	5.33
A0388	481.46	2.29	5.33
A0389	506.86	2.41	5.33
A0390	532.26	2.41	5.33
A0391	557.66	2.54	5.33
A0392	582.68	2.67	5.33
A0393	608.08	2.79	5.33
A0394	633.48	2.92	5.33
A0395	658.88	3.05	5.33
CS 6.99 mm
A0400	34.29	0.33	6.99
A0401	37.47	0.36	6.99
A0402	40.64	0.39	6.99
A0403	43.82	0.41	6.99
A0404	46.99	0.44	6.99
A0405	50.17	0.46	6.99
A0406	53.34	0.48	6.99
A0407	56.52	0.51	6.99
A0408	59.69	0.54	6.99
A0409	62.87	0.56	6.99
A0410	66.04	0.59	6.99
A0411	69.22	0.61	6.99
A0412	72.39	0.64	6.99
A0413	75.57	0.66	6.99
A0414	78.74	0.67	6.99
A0415	81.92	0.71	6.99
A0416	85.09	0.73	6.99
A0417	88.27	0.75	6.99
A0418	91.44	0.79	6.99
A0419	94.62	0.81	6.99
A0420	97.79	0.83	6.99
A0421	100.97	0.84	6.99
A0422	104.14	0.87	6.99
A0423	107.32	0.89	6.99
A0424	110.49	0.91	6.99
A0425	113.67	0.84	6.99
A0426	116.84	0.84	6.99
A0427	120.02	0.84	6.99
A0428	123.19	0.84	6.99
A0429	126.37	0.94	6.99
A0430	129.54	0.94	6.99
A0431	132.72	0.94	6.99
A0432	135.89	0.94	6.99
A0433	139.07	0.94	6.99
A0434	142.24	0.94	6.99
A0435	145.42	0.94	6.99
A0436	148.59	0.94	6.99
A0437	151.77	0.94	6.99
A0438	158.12	1.02	6.99
A0439	164.47	1.02	6.99
A0440	170.82	1.02	6.99
A0441	177.17	1.02	6.99
A0442	183.52	1.14	6.99
A0443	189.87	1.14	6.99
A0444	196.22	1.14	6.99
A0445	202.57	1.14	6.99
A0446	215.27	1.40	6.99
A0447	227.97	1.40	6.99
A0448	240.67	1.40	6.99
A0449	253.37	1.40	6.99
A0450	266.07	1.52	6.99
A0451	278.77	1.52	6.99
A0452	291.47	1.52	6.99
A0453	304.17	1.52	6.99
A0454	316.87	1.52	6.99
A0455	329.57	1.52	6.99
A0456	342.27	1.78	6.99
A0457	354.97	1.78	6.99
A0458	367.67	1.78	6.99
A0459	380.37	1.78	6.99
A0460	393.07	1.78	6.99
A0461	405.26	1.91	6.99
A0462	417.96	1.91	6.99
A0463	430.66	2.03	6.99
A0464	443.36	2.16	6.99
A0465	456.06	2.16	6.99
A0466	468.76	2.16	6.99
A0467	481.46	2.29	6.99
A0468	494.16	2.29	6.99
A0469	506.86	2.41	6.99
A0470	532.26	2.41	6.99
A0471	557.66	2.54	6.99
A0472	582.68	2.67	6.99
A0473	608.08	2.79	6.99
A0474	633.48	2.92	6.99
A0475	658.88	3.05	6.99

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