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-105	0.143	3.63	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-106	0.174	4.42	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-107	0.206	5.23	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-108	0.237	6.02	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-109	0.299	7.59	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-110	0.362	9.19	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-111	0.424	10.77	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-112	0.487	12.37	±.005	±0.13	0.103	2.62	±.003	±0.08
AS 568A-113	0.549	13.94	±.007	±0.18	0.103	2.62	±.003	±0.08
AS 568A-114	0.612	15.54	±.009	±0.23	0.103	2.62	±.003	±0.08
AS 568A-115	0.674	17.12	±.009	±0.23	0.103	2.62	±.003	±0.08
AS 568A-116	0.737	18.72	±.009	±0.23	0.103	2.62	±.003	±0.08
AS 568A-117	0.799	20.3	±.010	±0.25	0.103	2.62	±.003	±0.08
AS 568A-118	0.862	21.89	±.010	±0.25	0.103	2.62	±.003	±0.08
AS 568A-119	0.924	23.47	±.010	±0.25	0.103	2.62	±.003	±0.08
AS 568A-120	0.987	25.07	±.010	±0.25	0.103	2.62	±.003	±0.08
AS 568A-121	1.049	26.64	±.010	±0.25	0.103	2.62	±.003	±0.08
AS 568A-122	1.112	28.24	±.010	±0.25	0.103	2.62	±.003	±0.08
AS 568A-123	1.174	29.82	±.012	±0.30	0.103	2.62	±.003	±0.08
AS 568A-124	1.237	31.42	±.012	±0.30	0.103	2.62	±.003	±0.08
AS 568A-125	1.299	32.99	±.012	±0.30	0.103	2.62	±.003	±0.08
AS 568A-126	1.362	34.59	±.012	±0.30	0.103	2.62	±.003	±0.08
AS 568A-127	1.424	36.17	±.012	±0.30	0.103	2.62	±.003	±0.08
AS 568A-128	1.487	37.77	±.012	±0.30	0.103	2.62	±.003	±0.08
AS 568A-129	1.549	39.34	±.015	±0.38	0.103	2.62	±.003	±0.08