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-130	1.612	40.94	±.015	±0.38	0.103	2.62	±.003	±0.08
AS 568A-131	1.674	42.52	±.015	±0.38	0.103	2.62	±.003	±0.08
AS 568A-132	1.737	44.12	±.015	±0.38	0.103	2.62	±.003	±0.08
AS 568A-133	1.799	45.69	±.015	±0.38	0.103	2.62	±.003	±0.08
AS 568A-134	1.862	47.3	±.015	±0.38	0.103	2.62	±.003	±0.08
AS 568A-135	1.925	48.9	±.017	±0.43	0.103	2.62	±.003	±0.08
AS 568A-136	1.987	50.47	±.017	±0.43	0.103	2.62	±.003	±0.08
AS 568A-137	2.05	52.07	±.017	±0.43	0.103	2.62	±.003	±0.08
AS 568A-138	2.112	53.64	±.017	±0.43	0.103	2.62	±.003	±0.08
AS 568A-139	2.175	55.25	±.017	±0.43	0.103	2.62	±.003	±0.08
AS 568A-140	2.237	56.82	±.017	±0.43	0.103	2.62	±.003	±0.08
AS 568A-141	2.3	58.42	±.020	±0.51	0.103	2.62	±.003	±0.08
AS 568A-142	2.362	59.99	±.020	±0.51	0.103	2.62	±.003	±0.08
AS 568A-143	2.425	61.6	±.020	±0.51	0.103	2.62	±.003	±0.08
AS 568A-144	2.487	63.17	±.020	±0.51	0.103	2.62	±.003	±0.08
AS 568A-145	2.55	64.77	±.020	±0.51	0.103	2.62	±.003	±0.08
AS 568A-146	2.612	66.34	±.020	±0.51	0.103	2.62	±.003	±0.08
AS 568A-147	2.675	67.95	±.022	±0.56	0.103	2.62	±.003	±0.08
AS 568A-148	2.737	69.52	±.022	±0.56	0.103	2.62	±.003	±0.08
AS 568A-149	2.8	71.12	±.022	±0.56	0.103	2.62	±.003	±0.08
AS 568A-150	2.862	72.69	±.022	±0.56	0.103	2.62	±.003	±0.08
AS 568A-151	2.987	75.87	±.024	±0.61	0.103	2.62	±.003	±0.08
AS 568A-152	3.237	82.22	±.024	±0.61	0.103	2.62	±.003	±0.08
AS 568A-153	3.487	88.57	±.024	±0.61	0.103	2.62	±.003	±0.08
AS 568A-154	3.737	94.92	±.028	±0.71	0.103	2.62	±.003	±0.08