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-430	5.1	129.54	±.037	±0.94	0.275	6.99	±.006	±0.15
AS 568A-431	5.225	132.72	±.037	±0.94	0.275	6.99	±.006	±0.15
AS 568A-432	5.35	135.89	±.037	±0.94	0.275	6.99	±.006	±0.15
AS 568A-433	5.475	139.07	±.037	±0.94	0.275	6.99	±.006	±0.15
AS 568A-434	5.6	142.24	±.037	±0.94	0.275	6.99	±.006	±0.15
AS 568A-435	5.725	145.42	±.037	±0.94	0.275	6.99	±.006	±0.15
AS 568A-436	5.85	148.59	±.037	±0.94	0.275	6.99	±.006	±0.15
AS 568A-437	5.975	151.77	±.037	±0.94	0.275	6.99	±.006	±0.15
AS 568A-438	6.225	158.12	±.040	±1.02	0.275	6.99	±.006	±0.15
AS 568A-439	6.475	164.47	±.040	±1.02	0.275	6.99	±.006	±0.15
AS 568A-440	6.725	170.82	±.040	±1.02	0.275	6.99	±.006	±0.15
AS 568A-441	6.975	177.17	±.040	±1.02	0.275	6.99	±.006	±0.15
AS 568A-442	7.225	183.52	±.045	±1.14	0.275	6.99	±.006	±0.15
AS 568A-443	7.475	189.87	±.045	±1.14	0.275	6.99	±.006	±0.15
AS 568A-444	7.725	196.22	±.045	±1.14	0.275	6.99	±.006	±0.15
AS 568A-445	7.975	202.57	±.045	±1.14	0.275	6.99	±.006	±0.15
AS 568A-446	8.475	215.27	±.055	±1.40	0.275	6.99	±.006	±0.15
AS 568A-447	8.975	227.97	±.055	±1.40	0.275	6.99	±.006	±0.15
AS 568A-448	9.475	240.67	±.055	±1.40	0.275	6.99	±.006	±0.15
AS 568A-449	9.975	253.37	±.055	±1.40	0.275	6.99	±.006	±0.15
AS 568A-450	10.475	266.07	±.060	±1.52	0.275	6.99	±.006	±0.15
AS 568A-451	10.975	278.77	±.060	±1.52	0.275	6.99	±.006	±0.15
AS 568A-452	11.475	291.47	±.060	±1.52	0.275	6.99	±.006	±0.15
AS 568A-453	11.975	304.17	±.060	±1.52	0.275	6.99	±.006	±0.15
AS 568A-454	12.475	316.87	±.060	±1.52	0.275	6.99	±.006	±0.15