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-004	0.07	1.78	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-005	0.101	2.57	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-006	0.114	2.9	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-007	0.145	3.68	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-008	0.176	4.47	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-009	0.208	5.28	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-010	0.239	6.07	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-011	0.301	7.65	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-012	0.364	9.25	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-013	0.426	10.82	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-014	0.489	12.42	±.005	±0.13	0.07	1.78	±.003	±0.08
AS 568A-015	0.551	14	±.007	±0.18	0.07	1.78	±.003	±0.08
AS 568A-016	0.614	15.6	±.009	±0.23	0.07	1.78	±.003	±0.08
AS 568A-017	0.676	17.17	±.009	±0.23	0.07	1.78	±.003	±0.08
AS 568A-018	0.739	18.77	±.009	±0.23	0.07	1.78	±.003	±0.08
AS 568A-019	0.801	20.35	±.009	±0.23	0.07	1.78	±.003	±0.08
AS 568A-020	0.864	21.95	±.009	±0.23	0.07	1.78	±.003	±0.08
AS 568A-021	0.926	23.52	±.009	±0.23	0.07	1.78	±.003	±0.08
AS 568A-022	0.989	25.12	±.010	±0.25	0.07	1.78	±.003	±0.08
AS 568A-023	1.051	26.7	±.010	±0.25	0.07	1.78	±.003	±0.08
AS 568A-024	1.114	28.3	±.010	±0.25	0.07	1.78	±.003	±0.08
AS 568A-025	1.176	29.87	±.011	±0.28	0.07	1.78	±.003	±0.08
AS 568A-026	1.239	31.47	±.011	±0.28	0.07	1.78	±.003	±0.08
AS 568A-027	1.301	33.05	±.011	±0.28	0.07	1.78	±.003	±0.08
AS 568A-028	1.364	34.65	±.013	±0.33	0.07	1.78	±.003	±0.08