British BS Standard O-ring Size Chart

British Standard O-Ring, usually refers to the O-Ring standard set by British Standards Institution (BSI).The BSI standard covers O-Ring dimensions, materials, tolerances and markings. The following is a detailed description of British Standard O-Rings:

Size specification

The dimensional specifications of British Standard O-Rings usually follow the BS 4518 standard, which defines a wide range of O-Ring sizes, each with a specific number. For example, BS 4518-004 indicates an O-Ring with an internal diameter of 4 mm and a cross sectional diameter of 1.9 mm.

Materials

British Standard O-rings can be manufactured using a variety of materials, common materials include:

Nitrile rubber (NBR): oil and abrasion resistant, suitable for most hydraulic and pneumatic applications.

Fluoroelastomer (FKM): high temperature and chemical resistant, suitable for extreme environments.

Silicone rubber (VMQ): high and low temperature resistant, suitable for food and medical industries.

Ethylene propylene diene diene (EPDM): ozone and UV resistant, suitable for outdoor applications.

Hydrogenated Nitrile Butadiene Rubber (HNBR): high temperature and oil resistant, suitable for high performance applications.

Tolerances

The BS 4518 standard has strict regulations on the internal diameter, section diameter and tolerances of O-rings to ensure that O-rings produced by different manufacturers can be used interchangeably. Tolerances are typically within ±0.1mm.

Marking

Each BS 4518 O-Ring is normally stamped with its size number, e.g. ‘BS 4518-004’, for ease of identification and use.

Applications

British Standard O-Rings are used in a wide range of industrial applications including:

Hydraulic systems: for sealing hydraulic cylinders, valves and pipe connections.

Pneumatic systems: used to seal pneumatic cylinders, valves and piping connections.

Mechanical equipment: used to seal gearboxes, bearings and other mechanical parts.

Pipeline connections: for sealing pipeline joints to prevent leakage.

Installation Precautions

Cleaning: Make sure the O-ring and groove are clean and free of impurities before installation.

Lubrication: During installation, appropriate lubricants (e.g. silicone grease) can be used to reduce friction and prevent damage to the O-ring.

Avoid twisting: Avoid twisting or stretching the O-ring during installation to avoid affecting the sealing effect.

Maintenance and Replacement

Regular inspection: Regularly check the wear and tear of the O-ring, and replace it in time if it is damaged or aged.

Storage conditions: O-rings should be stored in a cool, dry environment, avoiding direct sunlight and high temperatures.

Dash No.	CS (IN)	ID (IN)	OD (IN)	CS (MM)	ID (MM)	OD (MM)	Add to Cart

001	0.04	0.029	0.109	1.02	0.74	2.78	Get a Quote
002	0.05	0.042	0.142	1.27	1.07	3.61	Get a Quote
003	0.06	0.056	0.176	1.52	1.42	4.46	Get a Quote
004	0.07	0.07	0.21	1.78	1.78	5.34	Get a Quote
005	0.07	0.101	0.241	1.78	2.57	6.13	Get a Quote
006	0.07	0.114	0.254	1.78	2.9	6.46	Get a Quote
007	0.07	0.145	0.285	1.78	3.68	7.24	Get a Quote
008	0.07	0.176	0.316	1.78	4.47	8.03	Get a Quote
009	0.07	0.208	0.348	1.78	5.28	8.84	Get a Quote
010	0.07	0.239	0.379	1.78	6.07	9.63	Get a Quote
011	0.07	0.301	0.441	1.78	7.65	11.21	Get a Quote
012	0.07	0.364	0.504	1.78	9.25	12.81	Get a Quote
013	0.07	0.426	0.566	1.78	10.82	14.38	Get a Quote
014	0.07	0.489	0.629	1.78	12.42	15.98	Get a Quote
015	0.07	0.551	0.691	1.78	14	17.56	Get a Quote
016	0.07	0.614	0.754	1.78	15.6	19.16	Get a Quote
017	0.07	0.676	0.816	1.78	17.17	20.73	Get a Quote
018	0.07	0.739	0.879	1.78	18.77	22.33	Get a Quote
019	0.07	0.801	0.941	1.78	20.35	23.91	Get a Quote
020	0.07	0.864	1.004	1.78	21.95	25.51	Get a Quote
021	0.07	0.926	1.066	1.78	23.52	27.08	Get a Quote
022	0.07	0.989	1.129	1.78	25.12	28.68	Get a Quote
023	0.07	1.051	1.191	1.78	26.7	30.26	Get a Quote
024	0.07	1.114	1.254	1.78	28.3	31.86	Get a Quote
025	0.07	1.176	1.316	1.78	29.87	33.43	Get a Quote
026	0.07	1.239	1.379	1.78	31.47	35.03	Get a Quote
027	0.07	1.301	1.441	1.78	33.05	36.61	Get a Quote
028	0.07	1.364	1.504	1.78	34.65	38.21	Get a Quote
029	0.07	1.489	1.629	1.78	37.82	41.38	Get a Quote
030	0.07	1.614	1.754	1.78	41	44.56	Get a Quote
031	0.07	1.739	1.879	1.78	44.17	47.73	Get a Quote
032	0.07	1.864	2.004	1.78	47.35	50.91	Get a Quote
033	0.07	1.989	2.129	1.78	50.52	54.08	Get a Quote
034	0.07	2.114	2.254	1.78	53.7	57.26	Get a Quote
035	0.07	2.239	2.379	1.78	56.87	60.43	Get a Quote
036	0.07	2.364	2.504	1.78	60.05	63.61	Get a Quote
037	0.07	2.489	2.629	1.78	63.22	66.78	Get a Quote
038	0.07	2.614	2.754	1.78	66.4	69.96	Get a Quote
039	0.07	2.739	2.879	1.78	69.57	73.13	Get a Quote
040	0.07	2.864	3.004	1.78	72.75	76.31	Get a Quote
041	0.07	2.989	3.129	1.78	75.92	79.48	Get a Quote
042	0.07	3.239	3.379	1.78	82.27	85.83	Get a Quote
043	0.07	3.489	3.629	1.78	88.62	92.18	Get a Quote
044	0.07	3.739	3.879	1.78	94.97	98.53	Get a Quote
045	0.07	3.989	4.129	1.78	101.32	104.88	Get a Quote
046	0.07	4.239	4.379	1.78	107.67	111.23	Get a Quote
047	0.07	4.489	4.629	1.78	114.02	117.58	Get a Quote
048	0.07	4.739	4.879	1.78	120.37	123.93	Get a Quote
049	0.07	4.989	5.129	1.78	126.72	130.28	Get a Quote
050	0.07	5.239	5.379	1.78	133.07	136.63	Get a Quote
102	0.103	0.049	0.255	2.62	1.24	6.48	Get a Quote
103	0.103	0.081	0.287	2.62	2.06	7.30	Get a Quote
104	0.103	0.112	0.318	2.62	2.84	8.08	Get a Quote
105	0.103	0.143	0.349	2.62	3.63	8.87	Get a Quote
106	0.103	0.174	0.38	2.62	4.42	9.66	Get a Quote
107	0.103	0.206	0.412	2.62	5.23	10.47	Get a Quote
108	0.103	0.237	0.443	2.62	6.02	11.26	Get a Quote
109	0.103	0.299	0.505	2.62	7.59	12.83	Get a Quote
110	0.103	0.362	0.568	2.62	9.19	14.43	Get a Quote
111	0.103	0.424	0.63	2.62	10.77	16.01	Get a Quote
112	0.103	0.487	0.693	2.62	12.37	17.61	Get a Quote
113	0.103	0.549	0.755	2.62	13.94	19.18	Get a Quote
114	0.103	0.612	0.818	2.62	15.54	20.78	Get a Quote
115	0.103	0.674	0.88	2.62	17.12	22.36	Get a Quote
116	0.103	0.737	0.943	2.62	18.72	23.96	Get a Quote
117	0.103	0.799	1.005	2.62	20.29	25.53	Get a Quote
118	0.103	0.862	1.068	2.62	21.89	27.13	Get a Quote
119	0.103	0.924	1.13	2.62	23.47	28.71	Get a Quote
120	0.103	0.987	1.193	2.62	25.07	30.31	Get a Quote
121	0.103	1.049	1.255	2.62	26.64	31.88	Get a Quote
122	0.103	1.112	1.318	2.62	28.24	33.48	Get a Quote
123	0.103	1.174	1.38	2.62	29.82	35.06	Get a Quote
124	0.103	1.237	1.443	2.62	31.42	36.66	Get a Quote
125	0.103	1.299	1.505	2.62	32.99	38.23	Get a Quote
126	0.103	1.362	1.568	2.62	34.59	39.83	Get a Quote
127	0.103	1.424	1.63	2.62	36.17	41.41	Get a Quote
128	0.103	1.487	1.693	2.62	37.77	43.01	Get a Quote
129	0.103	1.549	1.755	2.62	39.34	44.58	Get a Quote
130	0.103	1.612	1.818	2.62	40.94	46.18	Get a Quote
131	0.103	1.674	1.88	2.62	42.52	47.76	Get a Quote
132	0.103	1.737	1.943	2.62	44.12	49.36	Get a Quote
133	0.103	1.799	2.005	2.62	45.69	50.93	Get a Quote
134	0.103	1.862	2.068	2.62	47.29	52.53	Get a Quote
135	0.103	1.925	2.131	2.62	48.9	54.14	Get a Quote
136	0.103	1.987	2.193	2.62	50.47	55.71	Get a Quote
137	0.103	2.05	2.256	2.62	52.07	57.31	Get a Quote
138	0.103	2.112	2.318	2.62	53.64	58.88	Get a Quote
139	0.103	2.175	2.381	2.62	55.25	60.49	Get a Quote
140	0.103	2.237	2.443	2.62	56.82	62.06	Get a Quote
141	0.103	2.3	2.506	2.62	58.42	63.66	Get a Quote
142	0.103	2.362	2.568	2.62	59.99	65.23	Get a Quote
143	0.103	2.425	2.631	2.62	61.6	66.84	Get a Quote
144	0.103	2.487	2.693	2.62	63.17	68.41	Get a Quote
145	0.103	2.55	2.756	2.62	64.77	70.01	Get a Quote
146	0.103	2.612	2.818	2.62	66.34	71.58	Get a Quote
147	0.103	2.675	2.881	2.62	67.95	73.19	Get a Quote
148	0.103	2.737	2.943	2.62	69.52	74.76	Get a Quote
149	0.103	2.8	3.006	2.62	71.12	76.36	Get a Quote
150	0.103	2.862	3.068	2.62	72.69	77.93	Get a Quote
151	0.103	2.987	3.193	2.62	75.87	81.11	Get a Quote
152	0.103	3.237	3.443	2.62	82.22	87.46	Get a Quote
153	0.103	3.487	3.693	2.62	88.57	93.81	Get a Quote
154	0.103	3.737	3.943	2.62	94.92	100.16	Get a Quote
155	0.103	3.987	4.193	2.62	101.27	106.51	Get a Quote
156	0.103	4.237	4.443	2.62	107.62	112.86	Get a Quote
157	0.103	4.487	4.693	2.62	113.97	119.21	Get a Quote
158	0.103	4.737	4.943	2.62	120.32	125.56	Get a Quote
159	0.103	4.987	5.193	2.62	126.67	131.91	Get a Quote
160	0.103	5.237	5.443	2.62	133.02	138.26	Get a Quote
161	0.103	5.487	5.693	2.62	139.37	144.61	Get a Quote
162	0.103	5.737	5.943	2.62	145.72	150.96	Get a Quote
163	0.103	5.987	6.193	2.62	152.07	157.31	Get a Quote
164	0.103	6.237	6.443	2.62	158.42	163.66	Get a Quote
165	0.103	6.487	6.693	2.62	164.77	170.01	Get a Quote
166	0.103	6.737	6.943	2.62	171.12	176.36	Get a Quote
167	0.103	6.987	7.193	2.62	177.47	182.71	Get a Quote
168	0.103	7.237	7.443	2.62	183.82	189.06	Get a Quote
169	0.103	7.487	7.693	2.62	190.17	195.41	Get a Quote
170	0.103	7.737	7.943	2.62	196.52	201.76	Get a Quote
171	0.103	7.987	8.193	2.62	202.87	208.11	Get a Quote
172	0.103	8.237	8.443	2.62	209.22	214.46	Get a Quote
173	0.103	8.487	8.693	2.62	215.57	220.81	Get a Quote
174	0.103	8.737	8.943	2.62	221.92	227.16	Get a Quote
175	0.103	8.987	9.193	2.62	228.27	233.51	Get a Quote
176	0.103	9.237	9.443	2.62	234.62	239.86	Get a Quote
177	0.103	9.487	9.693	2.62	240.97	246.21	Get a Quote
178	0.103	9.737	9.943	2.62	247.32	252.56	Get a Quote
201	0.139	0.171	0.449	3.53	4.34	11.40	Get a Quote
202	0.139	0.234	0.512	3.53	5.94	13.00	Get a Quote
203	0.139	0.296	0.574	3.53	7.52	14.58	Get a Quote
204	0.139	0.359	0.637	3.53	9.12	16.18	Get a Quote
205	0.139	0.421	0.699	3.53	10.69	17.75	Get a Quote
206	0.139	0.484	0.762	3.53	12.29	19.35	Get a Quote
207	0.139	0.546	0.824	3.53	13.87	20.93	Get a Quote
208	0.139	0.609	0.887	3.53	15.47	22.53	Get a Quote
209	0.139	0.671	0.949	3.53	17.04	24.10	Get a Quote
210	0.139	0.734	1.012	3.53	18.64	25.70	Get a Quote
211	0.139	0.796	1.074	3.53	20.22	27.28	Get a Quote
212	0.139	0.859	1.137	3.53	21.82	28.88	Get a Quote
213	0.139	0.921	1.199	3.53	23.39	30.45	Get a Quote
214	0.139	0.984	1.262	3.53	24.99	32.05	Get a Quote
215	0.139	1.046	1.324	3.53	26.57	33.63	Get a Quote
216	0.139	1.109	1.387	3.53	28.17	35.23	Get a Quote
217	0.139	1.171	1.449	3.53	29.74	36.80	Get a Quote
218	0.139	1.234	1.512	3.53	31.34	38.40	Get a Quote
219	0.139	1.296	1.574	3.53	32.92	39.98	Get a Quote
220	0.139	1.359	1.637	3.53	34.52	41.58	Get a Quote
221	0.139	1.421	1.699	3.53	36.09	43.15	Get a Quote
222	0.139	1.484	1.762	3.53	37.69	44.75	Get a Quote
223	0.139	1.609	1.887	3.53	40.87	47.93	Get a Quote
224	0.139	1.734	2.012	3.53	44.04	51.10	Get a Quote
225	0.139	1.859	2.137	3.53	47.22	54.28	Get a Quote
226	0.139	1.984	2.262	3.53	50.39	57.45	Get a Quote
227	0.139	2.109	2.387	3.53	53.57	60.63	Get a Quote
228	0.139	2.234	2.512	3.53	56.74	63.80	Get a Quote
229	0.139	2.359	2.637	3.53	59.92	66.98	Get a Quote
230	0.139	2.484	2.762	3.53	63.09	70.15	Get a Quote
231	0.139	2.609	2.887	3.53	66.27	73.33	Get a Quote
232	0.139	2.734	3.012	3.53	69.44	76.50	Get a Quote
233	0.139	2.859	3.137	3.53	72.62	79.68	Get a Quote
234	0.139	2.984	3.262	3.53	75.79	82.85	Get a Quote
235	0.139	3.109	3.387	3.53	78.97	86.03	Get a Quote
236	0.139	3.234	3.512	3.53	82.14	89.20	Get a Quote
237	0.139	3.359	3.637	3.53	85.32	92.38	Get a Quote
238	0.139	3.484	3.762	3.53	88.49	95.55	Get a Quote
239	0.139	3.609	3.887	3.53	91.67	98.73	Get a Quote
240	0.139	3.734	4.012	3.53	94.84	101.90	Get a Quote
241	0.139	3.859	4.137	3.53	98.02	105.08	Get a Quote
242	0.139	3.984	4.262	3.53	101.19	108.25	Get a Quote
243	0.139	4.109	4.387	3.53	104.37	111.43	Get a Quote
244	0.139	4.234	4.512	3.53	107.54	114.60	Get a Quote
245	0.139	4.359	4.637	3.53	110.72	117.78	Get a Quote
246	0.139	4.484	4.762	3.53	113.89	120.95	Get a Quote
247	0.139	4.609	4.887	3.53	117.07	124.13	Get a Quote
248	0.139	4.734	5.012	3.53	120.24	127.30	Get a Quote
249	0.139	4.859	5.137	3.53	123.42	130.48	Get a Quote
250	0.139	4.984	5.262	3.53	126.59	133.65	Get a Quote
251	0.139	5.109	5.387	3.53	129.77	136.83	Get a Quote
252	0.139	5.234	5.512	3.53	132.94	140.00	Get a Quote
253	0.139	5.359	5.637	3.53	136.12	143.18	Get a Quote
254	0.139	5.484	5.762	3.53	139.29	146.35	Get a Quote
255	0.139	5.609	5.887	3.53	142.47	149.53	Get a Quote
256	0.139	5.734	6.012	3.53	145.64	152.70	Get a Quote
257	0.139	5.859	6.137	3.53	148.82	155.88	Get a Quote
258	0.139	5.984	6.262	3.53	151.99	159.05	Get a Quote
259	0.139	6.234	6.512	3.53	158.34	165.40	Get a Quote
260	0.139	6.484	6.762	3.53	164.69	171.75	Get a Quote
261	0.139	6.734	7.012	3.53	171.04	178.10	Get a Quote
262	0.139	6.984	7.262	3.53	177.39	184.45	Get a Quote
263	0.139	7.234	7.512	3.53	183.74	190.80	Get a Quote
264	0.139	7.484	7.762	3.53	190.09	197.15	Get a Quote
265	0.139	7.734	8.012	3.53	196.44	203.50	Get a Quote
266	0.139	7.984	8.262	3.53	202.79	209.85	Get a Quote
267	0.139	8.234	8.512	3.53	209.14	216.20	Get a Quote
268	0.139	8.484	8.762	3.53	215.49	222.55	Get a Quote
269	0.139	8.734	9.012	3.53	221.84	228.90	Get a Quote
270	0.139	8.984	9.262	3.53	228.19	235.25	Get a Quote
271	0.139	9.234	9.512	3.53	234.54	241.60	Get a Quote
272	0.139	9.484	9.762	3.53	240.89	247.95	Get a Quote
273	0.139	9.734	10.012	3.53	247.24	254.30	Get a Quote
274	0.139	9.984	10.262	3.53	253.59	260.65	Get a Quote
275	0.139	10.484	10.762	3.53	266.29	273.35	Get a Quote
276	0.139	10.984	11.262	3.53	278.99	286.05	Get a Quote
277	0.139	11.484	11.762	3.53	291.69	298.75	Get a Quote
278	0.139	11.984	12.262	3.53	304.39	311.45	Get a Quote
279	0.139	12.984	13.262	3.53	329.79	336.85	Get a Quote
280	0.139	13.984	14.262	3.53	355.19	362.25	Get a Quote
281	0.139	14.984	15.262	3.53	380.59	387.65	Get a Quote
282	0.139	15.955	16.233	3.53	405.26	412.32	Get a Quote
283	0.139	16.955	17.233	3.53	430.66	437.72	Get a Quote
284	0.139	17.955	18.233	3.53	456.06	463.12	Get a Quote
309	0.21	0.412	0.832	5.33	10.46	21.12	Get a Quote
310	0.21	0.475	0.895	5.33	12.07	22.73	Get a Quote
311	0.21	0.537	0.957	5.33	13.64	24.30	Get a Quote
312	0.21	0.6	1.02	5.33	15.24	25.90	Get a Quote
313	0.21	0.662	1.082	5.33	16.81	27.47	Get a Quote
314	0.21	0.725	1.145	5.33	18.42	29.08	Get a Quote
315	0.21	0.787	1.207	5.33	19.99	30.65	Get a Quote
316	0.21	0.85	1.27	5.33	21.59	32.25	Get a Quote
317	0.21	0.912	1.332	5.33	23.16	33.82	Get a Quote
318	0.21	0.975	1.395	5.33	24.77	35.43	Get a Quote
319	0.21	1.037	1.457	5.33	26.34	37.00	Get a Quote
320	0.21	1.1	1.52	5.33	27.94	38.60	Get a Quote
321	0.21	1.162	1.582	5.33	29.51	40.17	Get a Quote
322	0.21	1.225	1.645	5.33	31.12	41.78	Get a Quote
323	0.21	1.287	1.707	5.33	32.69	43.35	Get a Quote
324	0.21	1.35	1.77	5.33	34.29	44.95	Get a Quote
325	0.21	1.475	1.895	5.33	37.47	48.13	Get a Quote
326	0.21	1.6	2.02	5.33	40.64	51.30	Get a Quote
327	0.21	1.725	2.145	5.33	43.82	54.48	Get a Quote
328	0.21	1.85	2.27	5.33	46.99	57.65	Get a Quote
329	0.21	1.975	2.395	5.33	50.17	60.83	Get a Quote
330	0.21	2.1	2.52	5.33	53.34	64.00	Get a Quote
331	0.21	2.225	2.645	5.33	56.52	67.18	Get a Quote
332	0.21	2.35	2.77	5.33	59.69	70.35	Get a Quote
333	0.21	2.475	2.895	5.33	62.87	73.53	Get a Quote
334	0.21	2.6	3.02	5.33	66.04	76.70	Get a Quote
335	0.21	2.725	3.145	5.33	69.22	79.88	Get a Quote
336	0.21	2.85	3.27	5.33	72.39	83.05	Get a Quote
337	0.21	2.975	3.395	5.33	75.57	86.23	Get a Quote
338	0.21	3.1	3.52	5.33	78.74	89.40	Get a Quote
339	0.21	3.225	3.645	5.33	81.92	92.58	Get a Quote
340	0.21	3.35	3.77	5.33	85.09	95.75	Get a Quote
341	0.21	3.475	3.895	5.33	88.27	98.93	Get a Quote
342	0.21	3.6	4.02	5.33	91.44	102.10	Get a Quote
343	0.21	3.725	4.145	5.33	94.62	105.28	Get a Quote
344	0.21	3.85	4.27	5.33	97.79	108.45	Get a Quote
345	0.21	3.975	4.395	5.33	100.97	111.63	Get a Quote
346	0.21	4.1	4.52	5.33	104.14	114.80	Get a Quote
347	0.21	4.225	4.645	5.33	107.32	117.98	Get a Quote
348	0.21	4.35	4.77	5.33	110.49	121.15	Get a Quote
349	0.21	4.475	4.895	5.33	113.67	124.33	Get a Quote
350	0.21	4.6	5.02	5.33	116.84	127.50	Get a Quote
351	0.21	4.725	5.145	5.33	120.02	130.68	Get a Quote
352	0.21	4.85	5.27	5.33	123.19	133.85	Get a Quote
353	0.21	4.975	5.395	5.33	126.37	137.03	Get a Quote
354	0.21	5.1	5.52	5.33	129.54	140.20	Get a Quote
355	0.21	5.225	5.645	5.33	132.72	143.38	Get a Quote
356	0.21	5.35	5.77	5.33	135.89	146.55	Get a Quote
357	0.21	5.475	5.895	5.33	139.07	149.73	Get a Quote
358	0.21	5.6	6.02	5.33	142.24	152.90	Get a Quote
359	0.21	5.725	6.145	5.33	145.42	156.08	Get a Quote
360	0.21	5.85	6.27	5.33	148.59	159.25	Get a Quote
361	0.21	5.975	6.395	5.33	151.77	162.43	Get a Quote
362	0.21	6.225	6.645	5.33	158.12	168.78	Get a Quote
363	0.21	6.475	6.895	5.33	164.47	175.13	Get a Quote
364	0.21	6.725	7.145	5.33	170.82	181.48	Get a Quote
365	0.21	6.975	7.395	5.33	177.17	187.83	Get a Quote
366	0.21	7.225	7.645	5.33	183.52	194.18	Get a Quote
367	0.21	7.475	7.895	5.33	189.87	200.53	Get a Quote
368	0.21	7.725	8.145	5.33	196.22	206.88	Get a Quote
369	0.21	7.975	8.395	5.33	202.57	213.23	Get a Quote
370	0.21	8.225	8.645	5.33	208.92	219.58	Get a Quote
371	0.21	8.475	8.895	5.33	215.27	225.93	Get a Quote
372	0.21	8.725	9.145	5.33	221.62	232.28	Get a Quote
373	0.21	8.975	9.395	5.33	227.97	238.63	Get a Quote
374	0.21	9.225	9.645	5.33	234.32	244.98	Get a Quote
375	0.21	9.475	9.895	5.33	240.67	251.33	Get a Quote
376	0.21	9.725	10.145	5.33	247.02	257.68	Get a Quote
377	0.21	9.975	10.395	5.33	253.37	264.03	Get a Quote
378	0.21	10.475	10.895	5.33	266.07	276.73	Get a Quote
379	0.21	10.975	11.395	5.33	278.77	289.43	Get a Quote
380	0.21	11.475	11.895	5.33	291.47	302.13	Get a Quote
381	0.21	11.975	12.395	5.33	304.17	314.83	Get a Quote
382	0.21	12.975	13.395	5.33	329.57	340.23	Get a Quote
383	0.21	13.975	14.395	5.33	354.97	365.63	Get a Quote
384	0.21	14.975	15.395	5.33	380.37	391.03	Get a Quote
385	0.21	15.955	16.375	5.33	405.26	415.92	Get a Quote
386	0.21	16.955	17.375	5.33	430.66	441.32	Get a Quote
387	0.21	17.955	18.375	5.33	456.06	466.72	Get a Quote
388	0.21	18.955	19.375	5.33	481.46	492.12	Get a Quote
389	0.21	19.955	20.375	5.33	506.86	517.52	Get a Quote
390	0.21	20.955	21.375	5.33	532.26	542.92	Get a Quote
391	0.21	21.955	22.375	5.33	557.66	568.32	Get a Quote
392	0.21	22.94	23.36	5.33	582.68	593.34	Get a Quote
393	0.21	23.94	24.36	5.33	608.08	618.74	Get a Quote
394	0.21	24.94	25.36	5.33	633.48	644.14	Get a Quote
395	0.21	25.94	26.36	5.33	658.88	669.54	Get a Quote
425	0.275	4.475	5.025	6.99	113.67	127.65	Get a Quote
426	0.275	4.6	5.15	6.99	116.84	130.82	Get a Quote
427	0.275	4.725	5.275	6.99	120.02	134.00	Get a Quote
428	0.275	4.85	5.4	6.99	123.19	137.17	Get a Quote
429	0.275	4.975	5.525	6.99	126.37	140.35	Get a Quote
430	0.275	5.1	5.65	6.99	129.54	143.52	Get a Quote
431	0.275	5.225	5.775	6.99	132.72	146.70	Get a Quote
432	0.275	5.35	5.9	6.99	135.89	149.87	Get a Quote
433	0.275	5.475	6.025	6.99	139.07	153.05	Get a Quote
434	0.275	5.6	6.15	6.99	142.24	156.22	Get a Quote
435	0.275	5.725	6.275	6.99	145.42	159.40	Get a Quote
436	0.275	5.85	6.4	6.99	148.59	162.57	Get a Quote
437	0.275	5.975	6.525	6.99	151.77	165.75	Get a Quote
438	0.275	6.225	6.775	6.99	158.12	172.10	Get a Quote
439	0.275	6.475	7.025	6.99	164.47	178.45	Get a Quote
440	0.275	6.725	7.275	6.99	170.82	184.80	Get a Quote
441	0.275	6.975	7.525	6.99	177.17	191.15	Get a Quote
442	0.275	7.225	7.775	6.99	183.52	197.50	Get a Quote
443	0.275	7.475	8.025	6.99	189.87	203.85	Get a Quote
444	0.275	7.725	8.275	6.99	196.22	210.20	Get a Quote
445	0.275	7.975	8.525	6.99	202.57	216.55	Get a Quote
446	0.275	8.475	9.025	6.99	215.27	229.25	Get a Quote
447	0.275	8.975	9.525	6.99	227.97	241.95	Get a Quote
448	0.275	9.475	10.025	6.99	240.67	254.65	Get a Quote
449	0.275	9.975	10.525	6.99	253.37	267.35	Get a Quote
450	0.275	10.475	11.025	6.99	266.07	280.05	Get a Quote
451	0.275	10.975	11.525	6.99	278.77	292.75	Get a Quote
452	0.275	11.475	12.025	6.99	291.47	305.45	Get a Quote
453	0.275	11.975	12.525	6.99	304.17	318.15	Get a Quote
454	0.275	12.475	13.025	6.99	316.87	330.85	Get a Quote
455	0.275	12.975	13.525	6.99	329.57	343.55	Get a Quote
456	0.275	13.475	14.025	6.99	342.27	356.25	Get a Quote
457	0.275	13.975	14.525	6.99	354.97	368.95	Get a Quote
458	0.275	14.475	15.025	6.99	367.67	381.65	Get a Quote
459	0.275	14.975	15.525	6.99	380.37	394.35	Get a Quote
460	0.275	15.475	16.025	6.99	393.07	407.05	Get a Quote
461	0.275	15.955	16.505	6.99	405.26	419.24	Get a Quote
462	0.275	16.455	17.005	6.99	417.96	431.94	Get a Quote
463	0.275	16.955	17.505	6.99	430.66	444.64	Get a Quote
464	0.275	17.455	18.005	6.99	443.36	457.34	Get a Quote
465	0.275	17.955	18.505	6.99	456.06	470.04	Get a Quote
466	0.275	18.455	19.005	6.99	468.76	482.74	Get a Quote
467	0.275	18.955	19.505	6.99	481.46	495.44	Get a Quote
468	0.275	19.455	20.005	6.99	494.16	508.14	Get a Quote
469	0.275	19.955	20.505	6.99	506.86	520.84	Get a Quote
470	0.275	20.955	21.505	6.99	532.26	546.24	Get a Quote
471	0.275	21.955	22.505	6.99	557.66	571.64	Get a Quote
472	0.275	22.94	23.49	6.99	582.68	596.66	Get a Quote
473	0.275	23.94	24.49	6.99	608.08	622.06	Get a Quote
474	0.275	24.94	25.49	6.99	633.48	647.46	Get a Quote
475	0.275	25.94	26.49	6.99	658.88	672.86	Get a Quote
517	0.07	1.428	1.568	1.78	36.27	39.83	Get a Quote
519	0.07	1.553	1.693	1.78	39.45	43.01	Get a Quote
532	0.07	3.11	3.25	1.78	79	82.56	Get a Quote
534	0.07	3.36	3.5	1.78	85.34	88.90	Get a Quote
536	0.07	3.61	3.75	1.78	91.7	95.26	Get a Quote
538	0.07	3.86	4	1.78	98.05	101.61	Get a Quote
540	0.07	4.11	4.25	1.78	104.4	107.96	Get a Quote
542	0.07	4.36	4.5	1.78	110.74	114.30	Get a Quote
544	0.07	4.61	4.75	1.78	117.1	120.66	Get a Quote
546	0.07	4.86	5	1.78	123.44	127.00	Get a Quote
548	0.07	5.094	5.235	1.78	129.4	132.96	Get a Quote
550	0.07	5.345	5.485	1.78	135.76	139.32	Get a Quote
551	0.07	5.47	5.61	1.78	138.94	142.50	Get a Quote
552	0.07	5.595	5.735	1.78	142.11	145.67	Get a Quote
553	0.07	5.72	5.86	1.78	145.29	148.85	Get a Quote
554	0.07	5.845	5.985	1.78	148.46	152.02	Get a Quote
555	0.07	5.97	6.11	1.78	151.64	155.20	Get a Quote
556	0.07	6.095	6.235	1.78	154.81	158.37	Get a Quote
557	0.07	6.22	6.361	1.78	158	161.56	Get a Quote
558	0.07	6.345	6.485	1.78	161.16	164.72	Get a Quote
559	0.07	6.47	6.61	1.78	164.34	167.90	Get a Quote
560	0.07	6.595	6.735	1.78	167.51	171.07	Get a Quote
561	0.07	6.72	6.86	1.78	170.69	174.25	Get a Quote
562	0.07	6.845	6.985	1.78	173.87	177.43	Get a Quote
606	0.04	0.07	0.15	1.02	1.78	3.82	Get a Quote
610	0.07	0.266	0.406	1.78	6.75	10.31	Get a Quote
611	0.07	0.344	0.484	1.78	8.73	12.29	Get a Quote
613	0.103	0.39	0.596	2.62	9.9	15.14	Get a Quote
614	0.103	0.469	0.675	2.62	11.91	17.15	Get a Quote
615	0.103	0.516	0.722	2.62	13.1	18.34	Get a Quote
616	0.103	0.594	0.8	2.62	15.08	20.32	Get a Quote
617	0.103	0.703	0.909	2.62	17.86	23.10	Get a Quote
618	0.139	1.016	1.294	3.53	25.8	32.86	Get a Quote
619	0.21	2.938	3.358	5.33	74.63	85.29	Get a Quote
620	0.21	3.139	3.559	5.33	79.73	90.39	Get a Quote
621	0.21	3.531	3.951	5.33	89.69	100.35	Get a Quote
622	0.21	3.937	4.357	5.33	100	110.66	Get a Quote
623	0.21	4.313	4.732	5.33	109.54	120.20	Get a Quote
624	0.275	4.516	5.066	6.99	114.7	128.68	Get a Quote
625	0.275	4.906	5.456	6.99	124.6	138.58	Get a Quote
626	0.275	5.295	5.846	6.99	134.5	148.48	Get a Quote
627	0.275	6.28	6.83	6.99	159.5	173.48	Get a Quote
628	0.275	6.563	7.113	6.99	166.7	180.68	Get a Quote
640	0.103	2.925	3.131	2.62	74.3	79.54	Get a Quote
641	0.103	3.051	3.257	2.62	77.5	82.74	Get a Quote
642	0.103	3.173	3.38	2.62	80.6	85.84	Get a Quote
643	0.103	3.299	3.506	2.62	83.8	89.04	Get a Quote
644	0.21	6.102	6.522	5.33	155	165.66	Get a Quote
645	0.21	6.35	6.77	5.33	161.3	171.96	Get a Quote
646	0.21	6.602	7.022	5.33	167.7	178.36	Get a Quote
647	0.21	6.85	7.27	5.33	174	184.66	Get a Quote
648	0.275	12.224	12.775	6.99	310.5	324.48	Get a Quote
649	0.275	12.724	13.275	6.99	323.2	337.18	Get a Quote
650	0.275	13.224	13.775	6.99	335.9	349.88	Get a Quote
674	0.275	8.225	8.776	6.99	208.92	222.90	Get a Quote
676	0.275	8.725	9.276	6.99	221.62	235.60	Get a Quote
678	0.275	9.225	9.776	6.99	234.32	248.30	Get a Quote
680	0.275	9.724	10.275	6.99	247	260.98	Get a Quote
682	0.275	10.224	10.775	6.99	259.7	273.68	Get a Quote
684	0.275	10.724	11.275	6.99	272.4	286.38	Get a Quote
686	0.275	11.224	11.775	6.99	285.1	299.08	Get a Quote
688	0.275	11.724	12.275	6.99	297.8	311.78	Get a Quote
801	0.07	0.125	0.265	1.78	3.17	6.73	Get a Quote
802	0.07	0.187	0.328	1.78	4.76	8.32	Get a Quote
803	0.07	0.25	0.39	1.78	6.35	9.91	Get a Quote
804	0.07	0.313	0.453	1.78	7.94	11.50	Get a Quote
806	0.07	0.437	0.578	1.78	11.11	14.67	Get a Quote
807	0.103	0.5	0.706	2.62	12.7	17.94	Get a Quote
809	0.103	0.625	0.831	2.62	15.88	21.12	Get a Quote
810	0.103	0.687	0.894	2.62	17.46	22.70	Get a Quote
812	0.103	0.813	1.019	2.62	20.64	25.88	Get a Quote
813	0.103	0.875	1.081	2.62	22.23	27.47	Get a Quote
814	0.103	0.937	1.144	2.62	23.81	29.05	Get a Quote
824	0.139	1.563	1.841	3.53	39.7	46.76	Get a Quote
825	0.139	1.625	1.903	3.53	41.28	48.34	Get a Quote
826	0.139	1.687	1.965	3.53	42.86	49.92	Get a Quote
827	0.139	1.77	2.048	3.53	44.95	52.01	Get a Quote
828	0.139	1.813	2.091	3.53	46.04	53.10	Get a Quote
829	0.139	1.875	2.153	3.53	47.62	54.68	Get a Quote
830	0.139	1.937	2.215	3.53	49.2	56.26	Get a Quote
831	0.139	2	2.278	3.53	50.8	57.86	Get a Quote
832	0.139	2.063	2.341	3.53	52.4	59.46	Get a Quote
833	0.139	2.125	2.403	3.53	53.97	61.03	Get a Quote
834	0.139	2.187	2.465	3.53	55.56	62.62	Get a Quote
835	0.139	2.25	2.528	3.53	57.15	64.21	Get a Quote
836	0.139	2.313	2.591	3.53	58.74	65.80	Get a Quote
837	0.139	2.375	2.653	3.53	60.32	67.38	Get a Quote
838	0.139	2.437	2.715	3.53	61.9	68.96	Get a Quote
839	0.139	2.5	2.778	3.53	63.5	70.56	Get a Quote
840	0.139	2.563	2.841	3.53	65.1	72.16	Get a Quote
841	0.139	2.625	2.903	3.53	66.67	73.73	Get a Quote
842	0.139	2.687	2.965	3.53	68.26	75.32	Get a Quote
843	0.139	2.75	3.028	3.53	69.85	76.91	Get a Quote
844	0.139	2.813	3.091	3.53	71.44	78.50	Get a Quote
845	0.139	2.875	3.153	3.53	73.02	80.08	Get a Quote
846	0.139	2.937	3.215	3.53	74.6	81.66	Get a Quote
860	0.21	4.625	5.045	5.33	117.48	128.14	Get a Quote
861	0.21	4.75	5.17	5.33	120.65	131.31	Get a Quote
862	0.21	4.875	5.295	5.33	123.83	134.49	Get a Quote
863	0.21	5	5.42	5.33	127	137.66	Get a Quote
864	0.21	5.125	5.545	5.33	130.18	140.84	Get a Quote
865	0.21	5.25	5.67	5.33	133.35	144.01	Get a Quote
866	0.21	5.375	5.795	5.33	136.53	147.19	Get a Quote
867	0.21	5.5	5.92	5.33	139.7	150.36	Get a Quote
868	0.21	5.625	6.045	5.33	142.88	153.54	Get a Quote
869	0.21	5.75	6.17	5.33	146.05	156.71	Get a Quote
870	0.21	5.875	6.295	5.33	149.23	159.89	Get a Quote
872	0.275	6.126	6.676	6.99	155.6	169.58	Get a Quote
874	0.275	6.374	6.924	6.99	161.9	175.88	Get a Quote
876	0.275	6.626	7.176	6.99	168.3	182.28	Get a Quote
878	0.275	6.874	7.424	6.99	174.6	188.58	Get a Quote
880	0.275	7.126	7.676	6.99	181	194.98	Get a Quote
882	0.275	7.374	7.924	6.99	187.3	201.28	Get a Quote
884	0.275	7.626	8.176	6.99	193.7	207.68	Get a Quote
886	0.275	7.874	8.424	6.99	200	213.98	Get a Quote
901	0.056	0.185	0.297	1.42	4.7	7.54	Get a Quote
902	0.064	0.239	0.367	1.63	6.07	9.33	Get a Quote
903	0.064	0.301	0.43	1.63	7.65	10.91	Get a Quote
904	0.072	0.351	0.495	1.83	8.92	12.58	Get a Quote
905	0.072	0.414	0.558	1.83	10.52	14.18	Get a Quote
906	0.078	0.468	0.624	1.98	11.89	15.85	Get a Quote
907	0.082	0.53	0.694	2.08	13.46	17.62	Get a Quote
908	0.087	0.644	0.818	2.21	16.36	20.78	Get a Quote
909	0.097	0.706	0.9	2.46	17.93	22.85	Get a Quote
910	0.097	0.755	0.949	2.46	19.18	24.10	Get a Quote
911	0.116	0.863	1.095	2.95	21.92	27.82	Get a Quote
912	0.116	0.924	1.156	2.95	23.47	29.37	Get a Quote
913	0.116	0.986	1.218	2.95	25.04	30.94	Get a Quote
914	0.116	1.047	1.279	2.95	26.59	32.49	Get a Quote
916	0.116	1.171	1.403	2.95	29.74	35.64	Get a Quote
918	0.116	1.355	1.587	2.95	34.42	40.32	Get a Quote
920	0.118	1.475	1.711	3	37.47	43.47	Get a Quote
924	0.118	1.72	1.956	3	43.69	49.69	Get a Quote
928	0.118	2.09	2.326	3	53.09	59.09	Get a Quote
932	0.118	2.337	2.573	3	59.36	65.36	Get a Quote

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O-Ring Size Measurement：

Inside Diameter (ID) Measurement:

Use calipers or an ID micrometer to measure the inside diameter of the O-ring.

Measurements should be made to ensure that the O-ring is not twisted or deformed.

Usually measure two or three different locations to ensure consistent dimensions.

Record the smallest measurement as this is usually the tightest dimension of the O-Ring during assembly.

Cross-section diameter (CS) measurement:

Use an OD micrometer or micrometer gauge to measure the cross-section diameter of the O-ring.

Take measurements at several different locations on the O-ring, usually at four equal points along the circumference.

Record the largest measurement, as this is usually the loosest dimension of the O-ring during assembly.

Cross-sectional shape check:

Use a projector or microscope to check the cross-sectional shape of the O-ring.

Ensure that the cross-section is round with no ovality or other distortion.

If irregularities are found in the cross-sectional shape, further inspection of the manufacturing process or material quality may be required.

Hardness test:

Use a hardness tester to measure the hardness of the O-ring, which is important for determining material properties and suitability.

Hardness tests are usually performed at several different locations on the O-Ring to ensure consistency.

Tolerance checking:

Check the dimensional tolerances of the O-Ring according to the relevant standards (e.g. AS568).

Ensure that all measurements are within the specified tolerances.

Material and color check:

Check the material type and color of O-rings to ensure they meet requirements.

This is usually done through visual inspection and material identification testing

British BS Standard O-ring Size Chart

AS-568 USA Standard O-ring Size Chart

Universal Standard O-ring Size Chart

Common Metric Standard O-ring Size Chart

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