Buna-N Back-Ups 90 Durometer Rings

• O-Ring Sizing Chart (PDF)
• O-Ring Material Guide (PDF)

Master Item #	Actual Size I.D. (in)	Actual Size I.D. (mm)	Actual Size I.D. Tolerance (in)	Actual Size I.D. Tolerance (mm)	Actual Size W. (in)	Actual Size W. (mm)	Actual Size W. Tolerance (in)	Actual Size W. Tolerance (mm)
AS 568A-202	0.234	5.94	±.005	±0.13	0.139	3.53	±.004	±0.10
AS 568A-203	0.296	7.52	±.005	±0.13	0.139	3.53	±.004	±0.10
AS 568A-204	0.359	9.12	±.005	±0.13	0.139	3.53	±.004	±0.10
AS 568A-205	0.421	10.69	±.005	±0.13	0.139	3.53	±.004	±0.10
AS 568A-206	0.484	12.29	±.005	±0.13	0.139	3.53	±.004	±0.10
AS 568A-207	0.546	13.87	±.007	±0.17	0.139	3.53	±.004	±0.10
AS 568A-208	0.609	15.47	±.009	±0.23	0.139	3.53	±.004	±0.10
AS 568A-209	0.671	17.04	±.009	±0.23	0.139	3.53	±.004	±0.10
AS 568A-210	0.734	18.64	±.010	±0.25	0.139	3.53	±.004	±0.10
AS 568A-211	0.796	20.22	±.010	±0.25	0.139	3.53	±.004	±0.10
AS 568A-212	0.859	21.82	±.010	±0.25	0.139	3.53	±.004	±0.10
AS 568A-213	0.921	23.39	±.010	±0.25	0.139	3.53	±.004	±0.10
AS 568A-214	0.984	25	±.010	±0.25	0.139	3.53	±.004	±0.10
AS 568A-215	1.046	26.57	±.010	±0.25	0.139	3.53	±.004	±0.10
AS 568A-216	1.109	28.17	±.012	±0.30	0.139	3.53	±.004	±0.10
AS 568A-217	1.171	29.74	±.012	±0.30	0.139	3.53	±.004	±0.10
AS 568A-218	1.234	31.34	±.012	±0.30	0.139	3.53	±.004	±0.10
AS 568A-219	1.296	32.92	±.012	±0.30	0.139	3.53	±.004	±0.10
AS 568A-220	1.359	34.52	±.012	±0.30	0.139	3.53	±.004	±0.10
AS 568A-221	1.421	36.09	±.012	±0.30	0.139	3.53	±.004	±0.10
AS 568A-222	1.484	37.69	±.015	±0.38	0.139	3.53	±.004	±0.10
AS 568A-223	1.609	40.87	±.015	±0.38	0.139	3.53	±.004	±0.10
AS 568A-224	1.734	44.04	±.015	±0.38	0.139	3.53	±.004	±0.10
AS 568A-225	1.859	47.22	±.018	±0.46	0.139	3.53	±.004	±0.10
AS 568A-226	1.984	50.39	±.018	±0.46	0.139	3.53	±.004	±0.10