Back-up Ring Size Chart

The chart gives the metric and inch dimensions for the most common AS568 sizes of backup rings.

NOTE: The “A” dimension, or Axial Height, applies only to the rubber contoured backup rings. PTFE backup rings are flat, so do not have this contour.

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Dash Number	I.D. inch	Width inch	Thickness inch	A inch	I.D. mm	Width mm	Thickness mm	A mm
4	0.096	0.053	0.049	0.045	2.44	1.35	1.24	1.14
5	0.127	0.053	0.049	0.045	3.23	1.35	1.24	1.14
6	0.14	0.053	0.049	0.045	3.56	1.35	1.24	1.14
7	0.171	0.053	0.049	0.045	4.34	1.35	1.24	1.14
8	0.202	0.053	0.049	0.045	5.13	1.35	1.24	1.14
9	0.234	0.053	0.049	0.045	5.94	1.35	1.24	1.14
10	0.265	0.053	0.049	0.045	6.73	1.35	1.24	1.14
11	0.327	0.053	0.049	0.045	8.31	1.35	1.24	1.14
12	0.39	0.053	0.049	0.045	9.91	1.35	1.24	1.14
13	0.455	0.053	0.049	0.045	11.56	1.35	1.24	1.14
14	0.518	0.053	0.049	0.045	13.16	1.35	1.24	1.14
15	0.58	0.053	0.049	0.045	14.73	1.35	1.24	1.14
16	0.643	0.053	0.049	0.045	16.33	1.35	1.24	1.14
17	0.705	0.053	0.049	0.045	17.91	1.35	1.24	1.14
18	0.768	0.053	0.049	0.045	19.51	1.35	1.24	1.14
19	0.83	0.053	0.049	0.045	21.08	1.35	1.24	1.14
20	0.893	0.053	0.049	0.045	22.68	1.35	1.24	1.14
21	0.955	0.053	0.049	0.045	24.26	1.35	1.24	1.14
22	1.018	0.053	0.049	0.045	25.86	1.35	1.24	1.14
23	1.08	0.053	0.049	0.045	27.43	1.35	1.24	1.14
24	1.143	0.053	0.049	0.045	29.03	1.35	1.24	1.14
25	1.205	0.053	0.049	0.045	30.61	1.35	1.24	1.14
26	1.268	0.053	0.049	0.045	32.21	1.35	1.24	1.14
27	1.33	0.053	0.049	0.045	33.78	1.35	1.24	1.14
28	1.393	0.053	0.049	0.045	35.38	1.35	1.24	1.14

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