China Wholesale Price China As568 Standard Rubber O Ring Silicone O-Ring Color Rubber O Ring Manufacturer Manufacturers and Suppliers

Wholesale Price China As568 Standard Rubber O Ring Silicone O-Ring Color Rubber O Ring Manufacturer

Short Description:

Overview and sealing principle of Rubber O-ring

what is the rubber o-ring for and what kind of rubber is used in o-rings ?O-ring, also known as O-ring, is a type of rubber ring with a circular cross-sectional shape. O-ring is the most widely used sealing element in hydraulic and pneumatic systems. The O-ring has good sealing performance, which can be used for both static and dynamic sealing; Not only can it be used alone, but it is also a fundamental component of many combined sealing devices. It has a wide range of applications, and if the materials are selected properly, it can meet the requirements of various media and motion conditions.O-shaped sealing ring is an extrusion type seal, and the basic working principle of the extrusion type seal is to rely on the elastic deformation of the sealing element to create contact pressure on the sealing contact surface. If the contact pressure is greater than the internal pressure of the sealed medium, no leakage will occur, otherwise, leakage will occur.

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First -please check the oring size AS568

AS568 SIZE	Nominal ID	Nominal C/S	Measurements ID in inches	± ID	Measurements CS in inches	± CS	Measurements ID in mm	± ID	Measurements CS in mm	± C/S
-1	1/32	1/32	0.029	0.004	0.040	0.003	0.74	0.10	1.02	0.08
-2	3/64	3/64	0.042	0.004	0.050	0.003	1.07	0.10	1.27	0.08
-3	1/16	1/16	0.056	0.004	0.060	0.003	1.42	0.10	1.52	0.08
-4	5/64	1/16	0.070	0.005	0.070	0.003	1.78	0.13	1.78	0.08
-5	3/32	1/16	0.101	0.005	0.070	0.003	2.57	0.13	1.78	0.08
-6	1/8	1/16	0.114	0.005	0.070	0.003	2.90	0.13	1.78	0.08
-7	5/32	1/16	0.145	0.005	0.070	0.003	3.68	0.13	1.78	0.08
-8	3/16	1/16	0.176	0.005	0.070	0.003	4.47	0.13	1.78	0.08
-9	7/32	1/16	0.208	0.005	0.070	0.003	5.28	0.13	1.78	0.08
-10	1/4	1/16	0.239	0.005	0.070	0.003	6.07	0.13	1.78	0.08
-11	5/16	1/16	0.301	0.005	0.070	0.003	7.65	0.13	1.78	0.08
-12	3/8	1/16	0.364	0.005	0.070	0.003	9.25	0.13	1.78	0.08
-13	7/16	1/16	0.426	0.005	0.070	0.003	10.82	0.13	1.78	0.08
-14	1/2	1/16	0.489	0.005	0.070	0.003	12.42	0.13	1.78	0.08
-15	9/16	1/16	0.551	0.007	0.070	0.003	14.00	0.18	1.78	0.08
-16	5/8	1/16	0.614	0.009	0.070	0.003	15.60	0.23	1.78	0.08
-17	11/16	1/16	0.676	0.009	0.070	0.003	17.17	0.23	1.78	0.08
-18	3/4	1/16	0.739	0.009	0.070	0.003	18.77	0.23	1.78	0.08
-19	13/16	1/16	0.801	0.009	0.070	0.003	20.35	0.23	1.78	0.08
-20	7/8	1/16	0.864	0.009	0.070	0.003	21.95	0.23	1.78	0.08
-21	15/16	1/16	0.926	0.009	0.070	0.003	23.52	0.23	1.78	0.08
-22	1	1/16	0.989	0.010	0.070	0.003	25.12	0.25	1.78	0.08
-23	1 1/16	1/16	1.051	0.010	0.070	0.003	26.70	0.25	1.78	0.08
-24	1 1/8	1/16	1.114	0.010	0.070	0.003	28.30	0.25	1.78	0.08
-25	1 3/16	1/16	1.176	0.011	0.070	0.003	29.87	0.28	1.78	0.08
-26	1 1/4	1/16	1.239	0.011	0.070	0.003	31.47	0.28	1.78	0.08
-27	1 5/16	1/16	1.301	0.011	0.070	0.003	33.05	0.28	1.78	0.08
-28	1 3/8	1/16	1.364	0.013	0.070	0.003	34.65	0.33	1.78	0.08
-29	1 1/2	1/16	1.489	0.013	0.070	0.003	37.82	0.33	1.78	0.08
-30	1 5/8	1/16	1.614	0.013	0.070	0.003	41.00	0.33	1.78	0.08
-31	1 3/4	1/16	1.739	0.015	0.070	0.003	44.17	0.38	1.78	0.08
-32	1 7/8	1/16	1.864	0.015	0.070	0.003	47.35	0.38	1.78	0.08
-33	2	1/16	1.989	0.018	0.070	0.003	50.52	0.46	1.78	0.08
-34	2 1/8	1/16	2.114	0.018	0.070	0.003	53.70	0.46	1.78	0.08
-35	2 1/4	1/16	2.239	0.018	0.070	0.003	56.87	0.46	1.78	0.08
-36	2 3/8	1/16	2.364	0.018	0.070	0.003	60.05	0.46	1.78	0.08
-37	2 1/2	1/16	2.489	0.018	0.070	0.003	63.22	0.46	1.78	0.08
-38	2 5/8	1/16	2.614	0.020	0.070	0.003	66.40	0.51	1.78	0.08
-39	2 3/4	1/16	2.739	0.020	0.070	0.003	69.57	0.51	1.78	0.08
-40	2 7/8	1/16	2.864	0.020	0.070	0.003	72.75	0.51	1.78	0.08
-41	3	1/16	2.989	0.024	0.070	0.003	75.92	0.61	1.78	0.08
-42	3 1/4	1/16	3.239	0.024	0.070	0.003	82.27	0.61	1.78	0.08
-43	3 1/2	1/16	3.489	0.024	0.070	0.003	88.62	0.61	1.78	0.08
-44	3 3/4	1/16	3.739	0.027	0.070	0.003	94.97	0.69	1.78	0.08
-45	4	1/16	3.989	0.027	0.070	0.003	101.32	0.69	1.78	0.08
-46	4 1/4	1/16	4.239	0.030	0.070	0.003	107.67	0.76	1.78	0.08
-47	4 1/2	1/16	4.489	0.030	0.070	0.003	114.02	0.76	1.78	0.08
-48	4 3/4	1/16	4.739	0.030	0.070	0.003	120.37	0.76	1.78	0.08
-49	5	1/16	4.989	0.037	0.070	0.003	126.72	0.94	1.78	0.08
-50	5 1/4	1/16	5.239	0.037	0.070	0.003	133.07	0.94	1.78	0.08
-102	1/16	3/32	0.049	0.005	0.103	0.003	1.24	0.13	2.62	0.08
-103	3/32	3/32	0.081	0.005	0.103	0.003	2.06	0.13	2.62	0.08
-104	1/8	3/32	0.112	0.005	0.103	0.003	2.84	0.13	2.62	0.08
-105	5/32	3/32	0.143	0.005	0.103	0.003	3.63	0.13	2.62	0.08
-106	3/16	3/32	0.174	0.005	0.103	0.003	4.42	0.13	2.62	0.08
-107	7/32	3/32	0.206	0.005	0.103	0.003	5.23	0.13	2.62	0.08
-108	1/4	3/32	0.237	0.005	0.103	0.003	6.02	0.13	2.62	0.08
-109	5/16	3/32	0.299	0.005	0.103	0.003	7.59	0.13	2.62	0.08
-110	3/8	3/32	0.362	0.005	0.103	0.003	9.19	0.13	2.62	0.08
-111	7/16	3/32	0.424	0.005	0.103	0.003	10.77	0.13	2.62	0.08
-112	1/2	3/32	0.487	0.005	0.103	0.003	12.37	0.13	2.62	0.08
-113	9/16	3/32	0.549	0.007	0.103	0.003	13.94	0.18	2.62	0.08
-114	5/8	3/32	0.612	0.009	0.103	0.003	15.54	0.23	2.62	0.08
-115	11/16	3/32	0.674	0.009	0.103	0.003	17.12	0.23	2.62	0.08
-116	3/4	3/32	0.737	0.009	0.103	0.003	18.72	0.23	2.62	0.08
-117	13/16	3/32	0.799	0.010	0.103	0.003	20.29	0.25	2.62	0.08
-118	7/8	3/32	0.862	0.010	0.103	0.003	21.89	0.25	2.62	0.08
-119	15/16	3/32	0.924	0.010	0.103	0.003	23.47	0.25	2.62	0.08
-120	1	3/32	0.987	0.010	0.103	0.003	25.07	0.25	2.62	0.08
-121	1 1/16	3/32	1.049	0.010	0.103	0.003	26.64	0.25	2.62	0.08
-122	1 1/8	3/32	1.112	0.010	0.103	0.003	28.24	0.25	2.62	0.08
-123	1 3/16	3/32	1.174	0.012	0.103	0.003	29.82	0.30	2.62	0.08
-124	1 1/4	3/32	1.237	0.012	0.103	0.003	31.42	0.30	2.62	0.08
-125	1 5/16	3/32	1.299	0.012	0.103	0.003	32.99	0.30	2.62	0.08
-126	1 3/8	3/32	1.362	0.012	0.103	0.003	34.59	0.30	2.62	0.08
-127	1 7/16	3/32	1.424	0.012	0.103	0.003	36.17	0.30	2.62	0.08
-128	1 1/2	3/32	1.487	0.012	0.103	0.003	37.77	0.30	2.62	0.08
-129	1 9/16	3/32	1.549	0.015	0.103	0.003	39.34	0.38	2.62	0.08
-130	1 5/8	3/32	1.612	0.015	0.103	0.003	40.94	0.38	2.62	0.08
-131	1 11/16	3/32	1.674	0.015	0.103	0.003	42.52	0.38	2.62	0.08
-132	1 3/4	3/32	1.737	0.015	0.103	0.003	44.12	0.38	2.62	0.08
-133	1 13/16	3/32	1.799	0.015	0.103	0.003	45.69	0.38	2.62	0.08
-134	1 7/8	3/32	1.862	0.015	0.103	0.003	47.29	0.38	2.62	0.08
-135	1 15/16	3/32	1.925	0.017	0.103	0.003	48.90	0.43	2.62	0.08
-136	2	3/32	1.987	0.017	0.103	0.003	50.47	0.43	2.62	0.08
-137	2 1/16	3/32	2.050	0.017	0.103	0.003	52.07	0.43	2.62	0.08
-138	2 1/8	3/32	2.112	0.017	0.103	0.003	53.64	0.43	2.62	0.08
-139	2 3/16	3/32	2.175	0.017	0.103	0.003	55.25	0.43	2.62	0.08
-140	2 1/4	3/32	2.237	0.017	0.103	0.003	56.82	0.43	2.62	0.08
-141	2 5/16	3/32	2.300	0.020	0.103	0.003	58.42	0.51	2.62	0.08
-142	2 3/8	3/32	2.362	0.020	0.103	0.003	59.99	0.51	2.62	0.08
-143	2 7/16	3/32	2.425	0.020	0.103	0.003	61.60	0.51	2.62	0.08
-144	2 1/2	3/32	2.487	0.020	0.103	0.003	63.17	0.51	2.62	0.08
-145	2 9/16	3/32	2.550	0.020	0.103	0.003	64.77	0.51	2.62	0.08
-146	2 5/8	3/32	2.612	0.020	0.103	0.003	66.34	0.51	2.62	0.08
-147	2 11/16	3/32	2.675	0.022	0.103	0.003	67.95	0.56	2.62	0.08
-148	2 3/4	3/32	2.737	0.022	0.103	0.003	69.52	0.56	2.62	0.08
-149	2 13/16	3/32	2.800	0.022	0.103	0.003	71.12	0.56	2.62	0.08
-150	2 7/8	3/32	2.862	0.022	0.103	0.003	72.69	0.56	2.62	0.08
-151	3	3/32	2.987	0.024	0.103	0.003	75.87	0.61	2.62	0.08
-152	3 1/4	3/32	3.237	0.024	0.103	0.003	82.22	0.61	2.62	0.08
-153	3 1/2	3/32	3.487	0.024	0.103	0.003	88.57	0.61	2.62	0.08
-154	3 3/4	3/32	3.737	0.028	0.103	0.003	94.92	0.71	2.62	0.08
-155	4	3/32	3.987	0.028	0.103	0.003	101.27	0.71	2.62	0.08
-156	4 1/4	3/32	4.237	0.030	0.103	0.003	107.62	0.76	2.62	0.08
-157	4 1/2	3/32	4.487	0.030	0.103	0.003	113.97	0.76	2.62	0.08
-158	4 3/4	3/32	4.737	0.030	0.103	0.003	120.32	0.76	2.62	0.08
-159	5	3/32	4.987	0.035	0.103	0.003	126.67	0.89	2.62	0.08
-160	5 1/4	3/32	5.237	0.035	0.103	0.003	133.02	0.89	2.62	0.08
-161	5 1/2	3/32	5.487	0.035	0.103	0.003	139.37	0.89	2.62	0.08
-162	5 3/4	3/32	5.737	0.035	0.103	0.003	145.72	0.89	2.62	0.08
-163	6	3/32	5.987	0.035	0.103	0.003	152.07	0.89	2.62	0.08
-164	6 1/4	3/32	6.237	0.040	0.103	0.003	158.42	1.02	2.62	0.08
-165	6 1/2	3/32	6.487	0.040	0.103	0.003	164.77	1.02	2.62	0.08
-166	6 3/4	3/32	6.737	0.040	0.103	0.003	171.12	1.02	2.62	0.08
-167	7	3/32	6.987	0.040	0.103	0.003	177.47	1.02	2.62	0.08
-168	7 1/4	3/32	7.237	0.045	0.103	0.003	183.82	1.14	2.62	0.08
-169	7 1/2	3/32	7.487	0.045	0.103	0.003	190.17	1.14	2.62	0.08
-170	7 3/4	3/32	7.737	0.045	0.103	0.003	196.52	1.14	2.62	0.08
-171	8	3/32	7.987	0.045	0.103	0.003	202.87	1.14	2.62	0.08
-172	8 1/4	3/32	8.237	0.050	0.103	0.003	209.22	1.27	2.62	0.08
-173	8 1/2	3/32	8.487	0.050	0.103	0.003	215.57	1.27	2.62	0.08
-174	8 3/4	3/32	8.737	0.050	0.103	0.003	221.92	1.27	2.62	0.08
-175	9	3/32	8.987	0.050	0.103	0.003	228.27	1.27	2.62	0.08
-176	9 1/4	3/32	9.237	0.055	0.103	0.003	234.62	1.40	2.62	0.08
-177	9 1/2	3/32	9.487	0.055	0.103	0.003	240.97	1.40	2.62	0.08
-178	9 3/4	3/32	9.737	0.055	0.103	0.003	247.32	1.40	2.62	0.08
-201	3/16	1/8	0.171	0.005	0.139	0.004	4.34	0.13	3.53	0.10
-202	1/4	1/8	0.234	0.005	0.139	0.004	5.94	0.13	3.53	0.10
-203	5/16	1/8	0.296	0.005	0.139	0.004	7.52	0.13	3.53	0.10
-204	3/8	1/8	0.359	0.005	0.139	0.004	9.12	0.13	3.53	0.10
-205	7/16	1/8	0.421	0.005	0.139	0.004	10.69	0.13	3.53	0.10
-206	1/2	1/8	0.484	0.005	0.139	0.004	12.29	0.13	3.53	0.10
-207	9/16	1/8	0.546	0.007	0.139	0.004	13.87	0.18	3.53	0.10
-208	5/8	1/8	0.609	0.009	0.139	0.004	15.47	0.23	3.53	0.10
-209	11/16	1/8	0.671	0.009	0.139	0.004	17.04	0.23	3.53	0.10
-210	3/4	1/8	0.734	0.010	0.139	0.004	18.64	0.25	3.53	0.10
-211	13/16	1/8	0.796	0.010	0.139	0.004	20.22	0.25	3.53	0.10
-212	7/8	1/8	0.859	0.010	0.139	0.004	21.82	0.25	3.53	0.10
-213	15/16	1/8	0.921	0.010	0.139	0.004	23.39	0.25	3.53	0.10
-214	1	1/8	0.984	0.010	0.139	0.004	24.99	0.25	3.53	0.10
-215	1 1/16	1/8	1.046	0.010	0.139	0.004	26.57	0.25	3.53	0.10
-216	1 1/8	1/8	1.109	0.012	0.139	0.004	28.17	0.30	3.53	0.10
-217	1 3/16	1/8	1.171	0.012	0.139	0.004	29.74	0.30	3.53	0.10
-218	1 1/4	1/8	1.234	0.012	0.139	0.004	31.34	0.30	3.53	0.10
-219	1 5/16	1/8	1.296	0.012	0.139	0.004	32.92	0.30	3.53	0.10
-220	1 3/8	1/8	1.359	0.012	0.139	0.004	34.52	0.30	3.53	0.10
-221	1 7/16	1/8	1.421	0.012	0.139	0.004	36.09	0.30	3.53	0.10
-222	1 1/2	1/8	1.484	0.015	0.139	0.004	37.69	0.38	3.53	0.10
-223	1 5/8	1/8	1.609	0.015	0.139	0.004	40.87	0.38	3.53	0.10
-224	1 3/4	1/8	1.734	0.015	0.139	0.004	44.04	0.38	3.53	0.10
-225	1 7/8	1/8	1.859	0.018	0.139	0.004	47.22	0.46	3.53	0.10
-226	2	1/8	1.984	0.018	0.139	0.004	50.39	0.46	3.53	0.10
-227	2 1/8	1/8	2.109	0.018	0.139	0.004	53.57	0.46	3.53	0.10
-228	2 1/4	1/8	2.234	0.020	0.139	0.004	56.74	0.51	3.53	0.10
-229	2 3/8	1/8	2.359	0.020	0.139	0.004	59.92	0.51	3.53	0.10
-230	2 1/2	1/8	2.484	0.020	0.139	0.004	63.09	0.51	3.53	0.10
-231	2 5/8	1/8	2.609	0.020	0.139	0.004	66.27	0.51	3.53	0.10
-232	2 3/4	1/8	2.734	0.024	0.139	0.004	69.44	0.61	3.53	0.10
-233	2 7/8	1/8	2.859	0.024	0.139	0.004	72.62	0.61	3.53	0.10
-234	3	1/8	2.984	0.024	0.139	0.004	75.79	0.61	3.53	0.10
-235	3 1/8	1/8	3.109	0.024	0.139	0.004	78.97	0.61	3.53	0.10
-236	3 1/4	1/8	3.234	0.024	0.139	0.004	82.14	0.61	3.53	0.10
-237	3 3/8	1/8	3.359	0.024	0.139	0.004	85.32	0.61	3.53	0.10
-238	3 1/2	1/8	3.484	0.024	0.139	0.004	88.49	0.61	3.53	0.10
-239	3 5/8	1/8	3.609	0.028	0.139	0.004	91.67	0.71	3.53	0.10
-240	3 3/4	1/8	3.734	0.028	0.139	0.004	94.84	0.71	3.53	0.10
-241	3 7/8	1/8	3.859	0.028	0.139	0.004	98.02	0.71	3.53	0.10
-242	4	1/8	3.984	0.028	0.139	0.004	101.19	0.71	3.53	0.10
-243	4 1/8	1/8	4.109	0.028	0.139	0.004	104.37	0.71	3.53	0.10
-244	4 1/4	1/8	4.234	0.030	0.139	0.004	107.54	0.76	3.53	0.10
-245	4 3/8	1/8	4.359	0.030	0.139	0.004	110.72	0.76	3.53	0.10
-246	4 1/2	1/8	4.484	0.030	0.139	0.004	113.89	0.76	3.53	0.10
-247	4 5/8	1/8	4.609	0.030	0.139	0.004	117.07	0.76	3.53	0.10
-248	4 3/4	1/8	4.734	0.030	0.139	0.004	120.24	0.76	3.53	0.10
-249	4 7/8	1/8	4.859	0.035	0.139	0.004	123.42	0.89	3.53	0.10
-250	5	1/8	4.984	0.035	0.139	0.004	126.59	0.89	3.53	0.10
-251	5 1/8	1/8	5.109	0.035	0.139	0.004	129.77	0.89	3.53	0.10
-252	5 1/4	1/8	5.234	0.035	0.139	0.004	132.94	0.89	3.53	0.10
-253	5 3/8	1/8	5.359	0.035	0.139	0.004	136.12	0.89	3.53	0.10
-254	5 1/2	1/8	5.484	0.035	0.139	0.004	139.29	0.89	3.53	0.10
-255	5 5/8	1/8	5.609	0.035	0.139	0.004	142.47	0.89	3.53	0.10
-256	5 3/4	1/8	5.734	0.035	0.139	0.004	145.64	0.89	3.53	0.10
-257	5 7/8	1/8	5.859	0.035	0.139	0.004	148.82	0.89	3.53	0.10
-258	6	1/8	5.984	0.035	0.139	0.004	151.99	0.89	3.53	0.10
-259	6 1/4	1/8	6.234	0.040	0.139	0.004	158.34	1.02	3.53	0.10
-260	6 1/2	1/8	6.484	0.040	0.139	0.004	164.69	1.02	3.53	0.10
-261	6 3/4	1/8	6.734	0.040	0.139	0.004	171.04	1.02	3.53	0.10
-262	7	1/8	6.984	0.040	0.139	0.004	177.39	1.02	3.53	0.10
-263	7 1/4	1/8	7.234	0.045	0.139	0.004	183.74	1.14	3.53	0.10
-264	7 1/2	1/8	7.484	0.045	0.139	0.004	190.09	1.14	3.53	0.10
-265	7 3/4	1/8	7.734	0.045	0.139	0.004	196.44	1.14	3.53	0.10
-266	8	1/8	7.984	0.045	0.139	0.004	202.79	1.14	3.53	0.10
-267	8 1/4	1/8	8.234	0.050	0.139	0.004	209.14	1.27	3.53	0.10
-268	8 1/2	1/8	8.484	0.050	0.139	0.004	215.49	1.27	3.53	0.10
-269	8 3/4	1/8	8.734	0.050	0.139	0.004	221.84	1.27	3.53	0.10
-270	9	1/8	8.984	0.050	0.139	0.004	228.19	1.27	3.53	0.10
-271	9 1/4	1/8	9.234	0.055	0.139	0.004	234.54	1.40	3.53	0.10
-272	9 1/2	1/8	9.484	0.055	0.139	0.004	240.89	1.40	3.53	0.10
-273	9 3/4	1/8	9.734	0.055	0.139	0.004	247.24	1.40	3.53	0.10
-274	10	1/8	9.984	0.055	0.139	0.004	253.59	1.40	3.53	0.10
-275	10 1/2	1/8	10.484	0.055	0.139	0.004	266.29	1.40	3.53	0.10
-276	11	1/8	10.984	0.065	0.139	0.004	278.99	1.65	3.53	0.10
-277	11 1/2	1/8	11.484	0.065	0.139	0.004	291.69	1.65	3.53	0.10
-278	12	1/8	11.984	0.065	0.139	0.004	304.39	1.65	3.53	0.10
-279	13	1/8	12.984	0.065	0.139	0.004	329.79	1.65	3.53	0.10
-280	14	1/8	13.984	0.065	0.139	0.004	355.19	1.65	3.53	0.10
-281	15	1/8	14.984	0.065	0.139	0.004	380.59	1.65	3.53	0.10
-282	16	1/8	15.955	0.075	0.139	0.004	405.26	1.91	3.53	0.10
-283	17	1/8	16.955	0.080	0.139	0.004	430.66	2.03	3.53	0.10
-284	18	1/8	17.955	0.085	0.139	0.004	456.06	2.16	3.53	0.10
-309	7/16	3/16	0.412	0.005	0.210	0.005	10.46	0.13	5.33	0.13
-310	1/2	3/16	0.475	0.005	0.210	0.005	12.07	0.13	5.33	0.13
-311	9/16	3/16	0.537	0.007	0.210	0.005	13.64	0.18	5.33	0.13
-312	5/8	3/16	0.600	0.009	0.210	0.005	15.24	0.23	5.33	0.13
-313	11/16	3/16	0.662	0.009	0.210	0.005	16.81	0.23	5.33	0.13
-314	3/4	3/16	0.725	0.010	0.210	0.005	18.42	0.25	5.33	0.13
-315	13/16	3/16	0.787	0.010	0.210	0.005	19.99	0.25	5.33	0.13
-316	7/8	3/16	0.850	0.010	0.210	0.005	21.59	0.25	5.33	0.13
-317	15/16	3/16	0.912	0.010	0.210	0.005	23.16	0.25	5.33	0.13
-318	1	3/16	0.975	0.010	0.210	0.005	24.77	0.25	5.33	0.13
-319	1 1/16	3/16	1.037	0.010	0.210	0.005	26.34	0.25	5.33	0.13
-320	1 1/8	3/16	1.100	0.012	0.210	0.005	27.94	0.30	5.33	0.13
-321	1 3/16	3/16	1.162	0.012	0.210	0.005	29.51	0.30	5.33	0.13
-322	1 1/4	3/16	1.225	0.012	0.210	0.005	31.12	0.30	5.33	0.13
-323	1 5/16	3/16	1.287	0.012	0.210	0.005	32.69	0.30	5.33	0.13
-324	1 3/8	3/16	1.350	0.012	0.210	0.005	34.29	0.30	5.33	0.13
-325	1 1/2	3/16	1.475	0.015	0.210	0.005	37.47	0.38	5.33	0.13
-326	1 5/8	3/16	1.600	0.015	0.210	0.005	40.64	0.38	5.33	0.13
-327	1 3/4	3/16	1.725	0.015	0.210	0.005	43.82	0.38	5.33	0.13
-328	1 7/8	3/16	1.850	0.015	0.210	0.005	46.99	0.38	5.33	0.13
-329	2	3/16	1.975	0.018	0.210	0.005	50.17	0.46	5.33	0.13
-330	2 1/8	3/16	2.100	0.018	0.210	0.005	53.34	0.46	5.33	0.13
-331	2 1/4	3/16	2.225	0.018	0.210	0.005	56.52	0.46	5.33	0.13
-332	2 3/8	3/16	2.350	0.018	0.210	0.005	59.69	0.46	5.33	0.13
-333	2 1/2	3/16	2.475	0.020	0.210	0.005	62.87	0.51	5.33	0.13
-334	2 5/8	3/16	2.600	0.020	0.210	0.005	66.04	0.51	5.33	0.13
-335	2 3/4	3/16	2.725	0.020	0.210	0.005	69.22	0.51	5.33	0.13
-336	2 7/8	3/16	2.850	0.020	0.210	0.005	72.39	0.51	5.33	0.13
-337	3	3/16	2.975	0.024	0.210	0.005	75.57	0.61	5.33	0.13
-338	3 1/8	3/16	3.100	0.024	0.210	0.005	78.74	0.61	5.33	0.13
-339	3 1/4	3/16	3.225	0.024	0.210	0.005	81.92	0.61	5.33	0.13
-340	3 3/8	3/16	3.350	0.024	0.210	0.005	85.09	0.61	5.33	0.13
-341	3 1/2	3/16	3.475	0.024	0.210	0.005	88.27	0.61	5.33	0.13
-342	3 5/8	3/16	3.600	0.028	0.210	0.005	91.44	0.71	5.33	0.13
-343	3 3/4	3/16	3.725	0.028	0.210	0.005	94.62	0.71	5.33	0.13
-344	3 7/8	3/16	3.850	0.028	0.210	0.005	97.79	0.71	5.33	0.13
-345	4	3/16	3.975	0.028	0.210	0.005	100.97	0.71	5.33	0.13
-346	4 1/8	3/16	4.100	0.028	0.210	0.005	104.14	0.71	5.33	0.13
-347	4 1/4	3/16	4.225	0.030	0.210	0.005	107.32	0.76	5.33	0.13
-348	4 3/8	3/16	4.350	0.030	0.210	0.005	110.49	0.76	5.33	0.13
-349	4 1/2	3/16	4.475	0.030	0.210	0.005	113.67	0.76	5.33	0.13
-350	4 5/8	3/16	4.600	0.030	0.210	0.005	116.84	0.76	5.33	0.13
-351	4 3/4	3/16	4.725	0.030	0.210	0.005	120.02	0.76	5.33	0.13
-352	4 7/8	3/16	4.850	0.030	0.210	0.005	123.19	0.76	5.33	0.13
-353	5	3/16	4.975	0.037	0.210	0.005	126.37	0.94	5.33	0.13
-354	5 1/8	3/16	5.100	0.037	0.210	0.005	129.54	0.94	5.33	0.13
-355	5 1/4	3/16	5.225	0.037	0.210	0.005	132.72	0.94	5.33	0.13
-356	5 3/8	3/16	5.350	0.037	0.210	0.005	135.89	0.94	5.33	0.13
-357	5 1/2	3/16	5.475	0.037	0.210	0.005	139.07	0.94	5.33	0.13
-358	5 5/8	3/16	5.600	0.037	0.210	0.005	142.24	0.94	5.33	0.13
-359	5 3/4	3/16	5.725	0.037	0.210	0.005	145.42	0.94	5.33	0.13
-360	5 7/8	3/16	5.850	0.037	0.210	0.005	148.59	0.94	5.33	0.13
-361	6	3/16	5.975	0.037	0.210	0.005	151.77	0.94	5.33	0.13
-362	6 1/4	3/16	6.225	0.040	0.210	0.005	158.12	1.02	5.33	0.13
-363	6 1/2	3/16	6.475	0.040	0.210	0.005	164.47	1.02	5.33	0.13
-364	6 3/4	3/16	6.725	0.040	0.210	0.005	170.82	1.02	5.33	0.13
-365	7	3/16	6.975	0.040	0.210	0.005	177.17	1.02	5.33	0.13
-366	7 1/4	3/16	7.225	0.045	0.210	0.005	183.52	1.14	5.33	0.13
-367	7 1/2	3/16	7.475	0.045	0.210	0.005	189.87	1.14	5.33	0.13
-368	7 3/4	3/16	7.725	0.045	0.210	0.005	196.22	1.14	5.33	0.13
-369	8	3/16	7.975	0.045	0.210	0.005	202.57	1.14	5.33	0.13
-370	8 1/4	3/16	8.225	0.050	0.210	0.005	208.92	1.27	5.33	0.13
-371	8 1/2	3/16	8.475	0.050	0.210	0.005	215.27	1.27	5.33	0.13
-372	8 3/4	3/16	8.725	0.050	0.210	0.005	221.62	1.27	5.33	0.13
-373	9	3/16	8.975	0.050	0.210	0.005	227.97	1.27	5.33	0.13
-374	9 1/4	3/16	9.225	0.055	0.210	0.005	234.32	1.40	5.33	0.13
-375	9 1/2	3/16	9.475	0.055	0.210	0.005	240.67	1.40	5.33	0.13
-376	9 3/4	3/16	9.725	0.055	0.210	0.005	247.02	1.40	5.33	0.13
-377	10	3/16	9.975	0.055	0.210	0.005	253.37	1.40	5.33	0.13
-378	10 1/2	3/16	10.475	0.060	0.210	0.005	266.07	1.52	5.33	0.13
-379	11	3/16	10.975	0.060	0.210	0.005	278.77	1.52	5.33	0.13
-380	11 1/2	3/16	11.475	0.065	0.210	0.005	291.47	1.65	5.33	0.13
-381	12	3/16	11.975	0.065	0.210	0.005	304.17	1.65	5.33	0.13
-382	13	3/16	12.975	0.065	0.210	0.005	329.57	1.65	5.33	0.13
-383	14	3/16	13.975	0.070	0.210	0.005	354.97	1.78	5.33	0.13
-384	15	3/16	14.975	0.070	0.210	0.005	380.37	1.78	5.33	0.13
-385	16	3/16	15.955	0.075	0.210	0.005	405.26	1.91	5.33	0.13
-386	17	3/16	16.955	0.080	0.210	0.005	430.66	2.03	5.33	0.13
-387	18	3/16	17.955	0.085	0.210	0.005	456.06	2.16	5.33	0.13
-388	19	3/16	18.955	0.090	0.210	0.005	481.45	2.29	5.33	0.13
-389	20	3/16	19.955	0.095	0.210	0.005	506.85	2.41	5.33	0.13
-390	21	3/16	20.955	0.095	0.210	0.005	532.25	2.41	5.33	0.13
-391	22	3/16	21.955	0.100	0.210	0.005	557.65	2.54	5.33	0.13
-392	23	3/16	22.940	0.105	0.210	0.005	582.68	2.67	5.33	0.13
-393	24	3/16	23.940	0.110	0.210	0.005	608.08	2.79	5.33	0.13
-394	25	3/16	24.940	0.115	0.210	0.005	633.48	2.92	5.33	0.13
-395	26	3/16	25.940	0.120	0.210	0.005	658.88	3.05	5.33	0.13
-425	4 1/2	1/4	4.475	0.033	0.275	0.006	113.67	0.84	6.99	0.15
-426	4 5/8	1/4	4.600	0.033	0.275	0.006	116.84	0.84	6.99	0.15
-427	4 3/4	1/4	4.725	0.033	0.275	0.006	120.02	0.84	6.99	0.15
-428	4 7/8	1/4	4.850	0.033	0.275	0.006	123.19	0.84	6.99	0.15
-429	5	1/4	4.975	0.037	0.275	0.006	126.37	0.94	6.99	0.15
-430	5 1/8	1/4	5.100	0.037	0.275	0.006	129.54	0.94	6.99	0.15
-431	5 1/4	1/4	5.225	0.037	0.275	0.006	132.72	0.94	6.99	0.15
-432	5 3/8	1/4	5.350	0.037	0.275	0.006	135.89	0.94	6.99	0.15
-433	5 1/2	1/4	5.475	0.037	0.275	0.006	139.07	0.94	6.99	0.15
-434	5 5/8	1/4	5.600	0.037	0.275	0.006	142.24	0.94	6.99	0.15
-435	5 3/4	1/4	5.725	0.037	0.275	0.006	145.42	0.94	6.99	0.15
-436	5 7/8	1/4	5.850	0.037	0.275	0.006	148.59	0.94	6.99	0.15
-437	6	1/4	5.975	0.037	0.275	0.006	151.77	0.94	6.99	0.15
-438	6 1/4	1/4	6.225	0.040	0.275	0.006	158.12	1.02	6.99	0.15
-439	6 1/2	1/4	6.475	0.040	0.275	0.006	164.47	1.02	6.99	0.15
-440	6 3/4	1/4	6.725	0.040	0.275	0.006	170.82	1.02	6.99	0.15
-441	7	1/4	6.975	0.040	0.275	0.006	177.17	1.02	6.99	0.15
-442	7 1/4	1/4	7.225	0.045	0.275	0.006	183.52	1.14	6.99	0.15
-443	7 1/2	1/4	7.475	0.045	0.275	0.006	189.87	1.14	6.99	0.15
-444	7 3/4	1/4	7.725	0.045	0.275	0.006	196.22	1.14	6.99	0.15
-445	8	1/4	7.975	0.045	0.275	0.006	202.57	1.14	6.99	0.15
-446	8 1/2	1/4	8.475	0.055	0.275	0.006	215.27	1.40	6.99	0.15
-447	9	1/4	8.975	0.055	0.275	0.006	227.97	1.40	6.99	0.15
-448	9 1/2	1/4	9.475	0.055	0.275	0.006	240.67	1.40	6.99	0.15
-449	10	1/4	9.975	0.055	0.275	0.006	253.37	1.40	6.99	0.15
-450	10 1/2	1/4	10.475	0.060	0.275	0.006	266.07	1.52	6.99	0.15
-451	11	1/4	10.975	0.060	0.275	0.006	278.77	1.52	6.99	0.15
-452	11 1/2	1/4	11.475	0.060	0.275	0.006	291.47	1.52	6.99	0.15
-453	12	1/4	11.975	0.060	0.275	0.006	304.17	1.52	6.99	0.15
-454	12 1/2	1/4	12.475	0.060	0.275	0.006	316.87	1.52	6.99	0.15
-455	13	1/4	12.975	0.060	0.275	0.006	329.57	1.52	6.99	0.15
-456	13 1/2	1/4	13.475	0.070	0.275	0.006	342.27	1.78	6.99	0.15
-457	14	1/4	13.975	0.070	0.275	0.006	354.97	1.78	6.99	0.15
-458	14 1/2	1/4	14.475	0.070	0.275	0.006	367.67	1.78	6.99	0.15
-459	15	1/4	14.975	0.070	0.275	0.006	380.37	1.78	6.99	0.15
-460	15 1/2	1/4	15.475	0.070	0.275	0.006	393.07	1.78	6.99	0.15
-461	16	1/4	15.955	0.075	0.275	0.006	405.26	1.91	6.99	0.15
-462	16 1/2	1/4	16.455	0.075	0.275	0.006	417.96	1.91	6.99	0.15
-463	17	1/4	16.955	0.080	0.275	0.006	430.66	2.03	6.99	0.15
-464	17 1/2	1/4	17.455	0.085	0.275	0.006	443.36	2.16	6.99	0.15
-465	18	1/4	17.955	0.085	0.275	0.006	456.06	2.16	6.99	0.15
-466	18 1/2	1/4	18.455	0.085	0.275	0.006	468.76	2.16	6.99	0.15
-467	19	1/4	18.955	0.090	0.275	0.006	481.46	2.29	6.99	0.15
-468	19 1/2	1/4	19.455	0.090	0.275	0.006	494.16	2.29	6.99	0.15
-469	20	1/4	19.955	0.095	0.275	0.006	506.86	2.41	6.99	0.15
-470	21	1/4	20.955	0.095	0.275	0.006	532.26	2.41	6.99	0.15
-471	22	1/4	21.955	0.100	0.275	0.006	557.66	2.54	6.99	0.15
-472	23	1/4	22.940	0.105	0.275	0.006	582.68	2.67	6.99	0.15
-473	24	1/4	23.940	0.110	0.275	0.006	608.08	2.79	6.99	0.15
-474	25	1/4	24.940	0.115	0.275	0.006	633.48	2.92	6.99	0.15
-475	26	1/4	25.940	0.120	0.275	0.006	658.88	3.05	6.99	0.15
AS568 SIZE	Nominal ID		Measurements ID in inches	±ID	Measurements CS in inches	±CS	Measurements ID in mm	±ID	Measurements CS in mm	± C/S
-901	3/32		0.185	0.005	0.056	0.003	4.70	0.13	1.42	0.08
-902	1/8		0.239	0.005	0.064	0.003	6.07	0.13	1.63	0.08
-903	3/16		0.301	0.005	0.064	0.003	7.65	0.13	1.63	0.08
-904	1/4		0.351	0.005	0.072	0.003	8.92	0.13	1.83	0.08
-905	5/16		0.414	0.005	0.072	0.003	10.52	0.13	1.83	0.08
-906	3/8		0.468	0.005	0.078	0.003	11.89	0.13	1.98	0.08
-907	7/16		0.530	0.007	0.082	0.003	13.46	0.18	2.08	0.08
-908	1/2		0.644	0.009	0.087	0.003	16.36	0.23	2.21	0.08
-909	9/16		0.706	0.009	0.097	0.003	17.93	0.23	2.46	0.08
-910	5/8		0.755	0.009	0.097	0.003	19.18	0.23	2.46	0.08
-911	11/16		0.863	0.009	0.116	0.004	21.92	0.23	2.95	0.10
-912	3/4		0.924	0.009	0.116	0.004	23.47	0.23	2.95	0.10
-913	13/16		0.986	0.010	0.116	0.004	25.04	0.25	2.95	0.10
-914	7/8		1.047	0.010	0.116	0.004	26.59	0.25	2.95	0.10
-916	1		1.171	0.010	0.116	0.004	29.74	0.25	2.95	0.10
-918	1 1/8		1.355	0.012	0.116	0.004	34.42	0.30	2.95	0.10
-920	1 1/4		1.475	0.014	0.118	0.004	37.47	0.36	3.00	0.10
-924	1 1/2		1.720	0.014	0.118	0.004	43.69	0.36	3.00	0.10
-928	1 3/4		2.090	0.018	0.118	0.004	53.09	0.46	3.00	0.10
-932	2		2.337	0.018	0.118	0.004	59.36	0.46	3.00	0.10

Second -Compression rate and stretching amount for orings

The O-ring is a typical extruded seal. The compression ratio and stretching amount of the cross-sectional diameter of the O-ring are the main contents of sealing design, which are of great significance for sealing performance and service life. The good sealing effect of O-ring largely depends on the correct matching of O-ring size and groove size, forming a reasonable compression and stretching amount of the sealing ring.

1. Compression rate

The compression rate W is commonly expressed as follows:

W=(d0 h)/d0 × 100%

In the formula, d0- the cross-sectional diameter of the O-ring in the free state (mm);

H – The distance between the bottom of the O-ring groove and the sealed surface (groove depth), i.e. the cross-sectional height of the O-ring after compression (mm)

2.When selecting the compression ratio of the O-ring, the following three aspects should be considered:

(1). There should be sufficient sealing contact area;(2). Try to minimize the friction force;(3). Try to avoid permanent deformation.

It is not difficult to see from the above factors that there are contradictions between them. A high compression rate can obtain high contact pressure, but an excessive compression rate undoubtedly increases sliding friction and permanent deformation. If the compression rate is too small, it may be due to the coaxiality error and O-ring error of the sealing groove not meeting the requirements, resulting in the disappearance of some compression amount and causing leakage. Therefore, when choosing the compression ratio of the O-ring, it is necessary to weigh various factors. Generally, the compression rate of static seals is greater than that of dynamic seals, but its extreme value should be less than 25%. Otherwise, the compression stress will significantly relax and excessive permanent deformation will occur, especially in high-temperature working conditions.The selection of compression ratio W for O-ring seals should consider the usage conditions, such as static or dynamic seals; Static sealing can be divided into radial sealing and axial sealing; The leakage gap of radial seals (or cylindrical static seals) is the radial gap, while the leakage gap of axial seals (or planar static seals) is the axial gap. Axial sealing is divided into two situations based on whether the pressure medium acts on the inner diameter or outer diameter of the O-ring: internal pressure and external pressure. The increase in internal pressure leads to stretching, while the external pressure reduces the initial stretching of the O-ring. The different forms of static seals mentioned above have different directions of action of the sealing medium on the O-ring, so the pre pressure design is also different. For dynamic seals, it is necessary to distinguish between reciprocating motion seals and rotary motion seals.

(2). Static sealing: Like reciprocating sealing devices, cylindrical static sealing devices generally take W=10% to 15%; The flat static sealing device takes W=15%~30%.For dynamic sealing, it can be divided into three situations; The reciprocating motion is generally taken as W=10% to 15%. When selecting the compression ratio for rotary motion seals, the Joule heat effect must be considered. Generally speaking, the inner diameter of the O-ring used for rotary motion is 3% -5% larger than the shaft diameter, and the compression ratio of the outer diameter is W=3% -8%. For low friction sports, O-rings are generally selected with a smaller compression ratio of W=5% -8% in order to reduce frictional resistance. In addition, the expansion of rubber materials caused by medium and temperature should also be considered. Usually, beyond the given compression deformation, the maximum allowable expansion rate is 15%. Exceeding this range indicates that the material selection is not appropriate, and O-rings of other materials should be used instead, or the given compression deformation rate should be corrected.

(3)Stretching amount ,After being installed in the sealing groove, the O-ring generally has a certain amount of stretching. Like the compression rate, the amount of stretching also has a significant impact on the sealing performance and service life of the O-ring. A large amount of stretching not only makes it difficult to install the O-ring, but also reduces the compression rate due to changes in the cross-sectional diameter d0, leading to leakage. The stretching amount a can be expressed as follows:α= (d+d0)/(d1+d0) In the formula, d – shaft diameter (mm); D1– Inner diameter of O-ring (mm).The range of stretching amount is 1% -5%. The recommended values for the stretching amount of the O-ring are given in the table. The stretching amount of the O-ring can be selected according to the size of the shaft diameter according to the table’s selection limit. Precedence range of compression ratio and stretching amount for O-ring

Third-the relationship between the inner diameter(ID), outer diameter(OD), and wire diameter(C/S) of O-ring.

OD=ID+C/S*2 Such as : ID=3MM C/S=1MM OD=3MM+1*2=5MM

Fourth-Materials commonly used in the production of O-rings

NBR : NBR O-RING

has excellent oil resistance, benzene resistance, heat resistance, and physical and mechanical properties, and is one of the common raw materials for oil resistant rubber products. It is widely used in the manufacturing of oil resistant gaskets, gaskets, rubber hoses, aircraft mailboxes, flexible packaging, printing and dyeing rubber rollers, cable materials, and adhesives.

EPDM: EPDM O-RING

with excellent mechanical properties, chemical resistance, and heat resistance, while also exhibiting strong weather resistance. Ethylene propylene diene monomer (EPDM) exhibits excellent properties in terms of ozone resistance, heat resistance, weather resistance, and low softness, making it suitable for applications that are ozone resistant, weather resistant, and UV resistant. However, due to its own structural characteristics, the flame retardancy, oil resistance, and adhesion of EPDM rubber are relatively poor. Nevertheless, this type of rubber has a main chain saturated structure and can be blended with other materials to improve performance by learning from each other’s strengths and weaknesses

VMQ(SILICONE): SILICONE O-RING

with Temperature and oil resistance. Silicone rubber has good low-temperature resistance and can generally work at -55 ℃. After the introduction of phenyl, it can reach -73 ℃. The heat resistance of silicone rubber is also outstanding, and it can work for a long time at 180 ℃. It can withstand several weeks or more of elasticity even at slightly above 200 ℃, and can instantly withstand high temperatures above 300 ℃. Silicone rubber has good breathability and the oxygen permeability is the highest among synthetic polymers. In addition, silicone rubber also has prominent characteristics of physiological inertness and does not cause coagulation, making it widely used in the medical field.

VITON(FKM FPM):VITON O-RING

has excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance, and atmospheric aging resistance, and has been widely used in fields such as aerospace, aviation, automotive, petroleum, and household appliances. It is a key material that cannot be replaced in the cutting-edge industries of national defense

HNBR :HNBR O-RING

has good oil resistance (good resistance to fuel oil, lubricating oil, and aromatic solvents); And due to its highly saturated structure, it has good heat resistance, excellent chemical corrosion resistance (good resistance to Freon, acid, and alkali), excellent ozone resistance, and high compression permanent deformation resistance; At the same time, hydrogenated nitrile rubber also has characteristics such as high strength, high tear resistance, and excellent wear resistance, making it one of the most excellent rubbers in terms of comprehensive performance.

CR(neoprene) : CR O-RING

with good physical and mechanical properties, oil resistance, heat resistance, flame resistance, sunlight resistance, ozone resistance, acid and alkali resistance, and chemical reagent resistance. The disadvantage is poor cold resistance and storage stability. It has high tensile strength, elongation, reversible crystallinity, and good adhesion. Resistant to aging and heat. Excellent oil and chemical resistance

FVMQ: FVMQ O-RING with Good physical and mechanical properties and chemical stability, capable of long-term use at 200 ℃ and short-term use at 250 ℃; The brittleness point ranges from -20 ℃ to -40 ℃; Excellent medium resistance, excellent stability against organic solvents, inorganic acids, and oxidants, especially excellent acid resistance; It has excellent weather resistance and ozone resistance. After being exposed to the atmosphere for several years, its physical and mechanical properties change very little, and its effect on microorganisms is also relatively stable

FEPM(Aflas):FEPM O-RING

has good stability, chemical resistance, especially resistance to high concentrations of acids, alkalis, and strong oxidizing agents for various types of vehicle fuels, lubricants, brake oils, mineral oils, and silicone oils, as well as excellent resistance to high-pressure water vapor, water, and electrical insulation. It has low breathability and can be used at temperatures between -400 and 200 degrees Celsius

FFKM :FFKM O-RING

Has elasticity and thermal and chemical stability of polytetrafluoroethylene. Long term working temperature -39~288 degrees Celsius, short-term up to 315 degrees Celsius, still has a certain degree of plasticity below the embrittlement temperature, hard but not brittle, and can be bent. Stable for all chemicals except for swelling in fluorinated solvents. it is the Currently the most expensive rubber in the world.Brand: Kalrez

Fifth- rubber O-ring specifications Measurement methods and tools.

Common measuring tools have :

1-High precision projector

Instrument characteristics :Non contact measurement, making measurement invisible and suitable for measuring thin-walled and soft parts;Has strong image magnification function and stronger small size measurement ability;Fast measurement speed greatly improves measurement efficiency;The high density of sampling points ensures high reliability of measurement;Convenient clamping.

2-Electronic digital caliper

Instrument characteristics :A length measurement tool that uses measurement systems such as capacitive and magnetic grids to display measurement values digitally. The commonly used resolution is 0.01mm, with an allowable error of ± 0.03mm/150mm. There are also high-precision digital calipers with a resolution of 0.005mm, with an allowable error of ± 0.015mm/150mm. There is also a multi-purpose digital display micrometer caliper with a resolution of 0.001mm (which is a national patent for Anyi measuring tools and only they can produce it), with a permissible error of ± 0.005mm/50mm. Due to the intuitive and clear reading, the measurement efficiency is high.

3-π ruler(PITAPE)

Instrument characteristics :

1. The π ruler is composed of an elastic steel strip. Its two ends are respectively engraved with the main and auxiliary rulers. The minimum graduation value of the main ruler is 0.5mm or 1mm; The minimum graduation values of the auxiliary ruler are 0.02mm, 0.05mm, 0.01mm, 0.1mm, etc.

2. When in use, wrap the π ruler around the workpiece and use a vernier reading method to directly read the average diameter of the measured piece.

Advantages and disadvantages

(1). High accuracy: As the diameter is measured through the circumference of the π ruler, the marking error during the production of the ruler can be reduced by π times and reflected in the measurement results. So in the φ In large diameter measurements above 500mm, its accuracy is higher than that of a vernier caliper. stay φ This advantage is particularly prominent in measurements above 1000mm.

(2). When measuring steel parts with a π ruler, it is not affected by the temperature of the work piece. This is because the π ruler is very thin, and it will be is othermal with the tested piece in a very short period of time during measurement. Additionally, their thermal expansion coefficients are very close, basically overcoming the influence of temperature.

(3. In the measurement of large and extra large diameters, the use of auxiliary components (patented magnetic bridges) allows for easy operation by one person at a time.

(4). Measuring thin-walled parts is not easy to cause deformation of the work piece. (5). Convenient to carry and store (6). The price is low.

(7). Disadvantage: Unable to lock the reading; Geometric deviations such as ovality cannot be measured.

Sixth O-ring Use and o-ring installation.

1. Use of O-ring

O-ring is widely used at the joints of various hydraulic and pneumatic components, cylinder surfaces, and flange surfaces. For O-rings used during movement, when the working pressure is greater than 9.8Mpa and subjected to unidirectional pressure, a retaining ring should be installed on the other side of the O-ring in the direction of pressure; If subjected to bidirectional compression, place a retaining ring on both sides of the O-ring. To reduce friction, wedge-shaped retaining rings can also be used. When the pressure liquid is applied from the left, the right retaining ring is pushed up, and the left retaining ring does not come into contact with the sealed surface, thus reducing the friction force. Overall, the use of retaining rings increases the friction force of the sealing device, and wedge shaped retaining rings are of great significance in reducing this friction force. For fixed O-rings, a retaining ring is also required when the working pressure is greater than 32Mpa.

2. Oring installation

The installation quality of O-rings has a significant impact on their sealing performance and service life. Leakage problems are often caused by poor installation.During the installation process, it is not allowed to have the O-ring scratched, misaligned, or twisted. Before assembly, the sealing groove and sealing mating surface must be strictly cleaned; At the same time, apply lubricating grease to the surface that needs to pass through during the assembly of the O-ring.To prevent the O-ring from being cut or scratched by sharp edges such as sharp corners and threads during installation, a 15 º to 30 º lead-in angle should be left at the shaft end and hole end of the installation. When the O-ring needs to pass through the external thread, a special thin-walled metal guide sleeve should be used to cover the external thread; If the O-ring needs to pass through the orifice, the orifice should be inverted into a corresponding diagonal shape to prevent scratches on the O-ring. The slope angle of the groove is generally a=120 º~140 º

You can learn a lot of related knowledge from here. Later, we will introduce some knowledge about oil seals, hydraulic seal, or other customized rubber parts ,such as Cat oil seal, NBR oil seal ,FKM oil seal, TC oil seal,TB oil seal TA oil seal , SC oil seal SB oil seal ,piston seal ,rod seal ,spring seal ,bonded seal, u cup seal,dust seal,Wiper seal,wear ring ,back up ring , rubber cords, o-ring cords ,so we need more time introduce this knowledge to everyone. Thanks for your time !

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