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-351	4.725	120.02	±.030	±0.76	0.21	5.33	±.005	±0.13
AS 568A-352	4.85	123.19	±.030	±0.76	0.21	5.33	±.005	±0.13
AS 568A-353	4.975	126.37	±.037	±0.94	0.21	5.33	±.005	±0.13
AS 568A-354	5.1	129.54	±.037	±0.94	0.21	5.33	±.005	±0.13
AS 568A-355	5.225	132.72	±.037	±0.94	0.21	5.33	±.005	±0.13
AS 568A-356	5.35	135.89	±.037	±0.94	0.21	5.33	±.005	±0.13
AS 568A-357	5.475	139.07	±.037	±0.94	0.21	5.33	±.005	±0.13
AS 568A-358	5.6	142.24	±.037	±0.94	0.21	5.33	±.005	±0.13
AS 568A-359	5.725	145.42	±.037	±0.94	0.21	5.33	±.005	±0.13
AS 568A-360	5.85	148.59	±.037	±0.94	0.21	5.33	±.005	±0.13
AS 568A-361	5.975	151.77	±.037	±0.94	0.21	5.33	±.005	±0.13
AS 568A-362	6.225	158.12	±.040	±1.02	0.21	5.33	±.005	±0.13
AS 568A-363	6.475	164.47	±.040	±1.02	0.21	5.33	±.005	±0.13
AS 568A-364	6.725	170.82	±.040	±1.02	0.21	5.33	±.005	±0.13
AS 568A-365	6.975	177.17	±.040	±1.02	0.21	5.33	±.005	±0.13
AS 568A-366	7.225	183.52	±.045	±1.14	0.21	5.33	±.005	±0.13
AS 568A-367	7.475	189.87	±.045	±1.14	0.21	5.33	±.005	±0.13
AS 568A-368	7.725	196.22	±.045	±1.14	0.21	5.33	±.005	±0.13
AS 568A-369	7.975	202.57	±.045	±1.14	0.21	5.33	±.005	±0.13
AS 568A-370	8.225	208.92	±.050	±1.27	0.21	5.33	±.005	±0.13
AS 568A-371	8.475	215.27	±.050	±1.27	0.21	5.33	±.005	±0.13
AS 568A-372	8.725	221.62	±.050	±1.27	0.21	5.33	±.005	±0.13
AS 568A-373	8.975	227.97	±.050	±1.27	0.21	5.33	±.005	±0.13
AS 568A-374	9.225	234.32	±.055	±1.40	0.21	5.33	±.005	±0.13
AS 568A-375	9.475	240.67	±.055	±1.40	0.21	5.33	±.005	±0.13