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-029	1.489	37.82	±.013	±0.33	0.07	1.78	±.003	±0.08
AS 568A-030	1.614	41	±.013	±0.33	0.07	1.78	±.003	±0.08
AS 568A-031	1.739	44.17	±.015	±0.38	0.07	1.78	±.003	±0.08
AS 568A-032	1.864	47.35	±.015	±0.38	0.07	1.78	±.003	±0.08
AS 568A-033	1.989	50.52	±.018	±0.46	0.07	1.78	±.003	±0.08
AS 568A-034	2.114	53.7	±.018	±0.46	0.07	1.78	±.003	±0.08
AS 568A-035	2.239	56.87	±.018	±0.46	0.07	1.78	±.003	±0.08
AS 568A-036	2.364	60.05	±.018	±0.46	0.07	1.78	±.003	±0.08
AS 568A-037	2.489	63.22	±.018	±0.46	0.07	1.78	±.003	±0.08
AS 568A-038	2.614	66.4	±.020	±0.51	0.07	1.78	±.003	±0.08
AS 568A-039	2.739	69.57	±.020	±0.51	0.07	1.78	±.003	±0.08
AS 568A-040	2.864	72.75	±.020	±0.51	0.07	1.78	±.003	±0.08
AS 568A-041	2.989	75.92	±.024	±0.61	0.07	1.78	±.003	±0.08
AS 568A-042	3.239	82.27	±.024	±0.61	0.07	1.78	±.003	±0.08
AS 568A-043	3.489	88.62	±.024	±0.61	0.07	1.78	±.003	±0.08
AS 568A-044	3.739	94.97	±.027	±0.69	0.07	1.78	±.003	±0.08
AS 568A-045	3.989	101.32	±.027	±0.69	0.07	1.78	±.003	±0.08
AS 568A-046	4.239	107.67	±.030	±0.76	0.07	1.78	±.003	±0.08
AS 568A-047	4.489	114.02	±.030	±0.76	0.07	1.78	±.003	±0.08
AS 568A-048	4.739	120.37	±.030	±0.76	0.07	1.78	±.003	±0.08
AS 568A-049	4.989	126.72	±.037	±0.94	0.07	1.78	±.003	±0.08
AS 568A-050	5.239	133.07	±.037	±0.94	0.07	1.78	±.003	±0.08
AS 568A-102	0.049	1.24	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-103	0.081	2.06	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-104	0.112	2.84	±.005	±0.13	0.103	2.62	±.003	±0.08