Backup Ring Size Chart (AS568)

AS568 back-up ring size chart with dash numbers, ID, width, height, and contour dimensions for high-pressure extrusion protection, plus how back-up rings fit the AS568 system.

History of back-up rings Master O-Ring Size Chart AS568 Size Chart

Back-up rings (anti-extrusion rings) sit beside an O-Ring to block the clearance gap under high pressure. Dash numbers match the companion O-Ring (for example an AS568-214 back-up fits an AS568-214 O-Ring). Tables below list ID, radial width (W), axial height (HT), and contour geometry.

Code links open a product search on theoringstore.com. Prefer the interactive AS568 Backup chip on the Master O-Ring Size Chart when you want nearest-match search.

346 sizes · AS568 Backup

0xx series

47 sizes

AS568 Backup 0xx series size table
Dash	Code	ID (in)	W (in)	HT (in)	Contour R (in)	Contour HT (in)	ID (mm)	W (mm)	HT (mm)
-004	AS568-004	0.096 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	2.44 ±0.13	1.35 ±0.08	1.24
-005	AS568-005	0.127 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	3.23 ±0.13	1.35 ±0.08	1.24
-006	AS568-006	0.140 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	3.56 ±0.13	1.35 ±0.08	1.24
-007	AS568-007	0.171 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	4.34 ±0.13	1.35 ±0.08	1.24
-008	AS568-008	0.202 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	5.13 ±0.13	1.35 ±0.08	1.24
-009	AS568-009	0.234 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	5.94 ±0.13	1.35 ±0.08	1.24
-010	AS568-010	0.265 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	6.73 ±0.13	1.35 ±0.08	1.24
-011	AS568-011	0.327 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	8.31 ±0.13	1.35 ±0.08	1.24
-012	AS568-012	0.390 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	9.91 ±0.13	1.35 ±0.08	1.24
-013	AS568-013	0.455 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	11.56 ±0.13	1.35 ±0.08	1.24
-014	AS568-014	0.518 ±.005	0.053 ±.003	0.049	0.087	0.045 ±.003	13.16 ±0.13	1.35 ±0.08	1.24
-015	AS568-015	0.580 ±.007	0.053 ±.003	0.049	0.087	0.045 ±.003	14.73 ±0.18	1.35 ±0.08	1.24
-016	AS568-016	0.643 ±.009	0.053 ±.003	0.049	0.087	0.045 ±.003	16.33 ±0.23	1.35 ±0.08	1.24
-017	AS568-017	0.705 ±.009	0.053 ±.003	0.049	0.087	0.045 ±.003	17.91 ±0.23	1.35 ±0.08	1.24
-018	AS568-018	0.768 ±.009	0.053 ±.003	0.049	0.087	0.045 ±.003	19.51 ±0.23	1.35 ±0.08	1.24
-019	AS568-019	0.830 ±.009	0.053 ±.003	0.049	0.087	0.045 ±.003	21.08 ±0.23	1.35 ±0.08	1.24
-020	AS568-020	0.893 ±.009	0.053 ±.003	0.049	0.087	0.045 ±.003	22.68 ±0.23	1.35 ±0.08	1.24
-021	AS568-021	0.955 ±.009	0.053 ±.003	0.049	0.087	0.045 ±.003	24.26 ±0.23	1.35 ±0.08	1.24
-022	AS568-022	1.018 ±.01	0.053 ±.003	0.049	0.087	0.045 ±.003	25.86 ±0.25	1.35 ±0.08	1.24
-023	AS568-023	1.080 ±.01	0.053 ±.003	0.049	0.087	0.045 ±.003	27.43 ±0.25	1.35 ±0.08	1.24
-024	AS568-024	1.143 ±.01	0.053 ±.003	0.049	0.087	0.045 ±.003	29.03 ±0.25	1.35 ±0.08	1.24
-025	AS568-025	1.205 ±.011	0.053 ±.003	0.049	0.087	0.045 ±.003	30.61 ±0.28	1.35 ±0.08	1.24
-026	AS568-026	1.268 ±.011	0.053 ±.003	0.049	0.087	0.045 ±.003	32.21 ±0.28	1.35 ±0.08	1.24
-027	AS568-027	1.330 ±.011	0.053 ±.003	0.049	0.087	0.045 ±.003	33.78 ±0.28	1.35 ±0.08	1.24
-028	AS568-028	1.393 ±.013	0.053 ±.003	0.049	0.087	0.045 ±.003	35.38 ±0.33	1.35 ±0.08	1.24
-029	AS568-029	1.518 ±.013	0.053 ±.003	0.049	0.087	0.045 ±.003	38.56 ±0.33	1.35 ±0.08	1.24
-030	AS568-030	1.643 ±.013	0.053 ±.003	0.049	0.087	0.045 ±.003	41.73 ±0.33	1.35 ±0.08	1.24
-031	AS568-031	1.768 ±.015	0.053 ±.003	0.049	0.087	0.045 ±.003	44.91 ±0.38	1.35 ±0.08	1.24
-032	AS568-032	1.893 ±.015	0.053 ±.003	0.049	0.087	0.045 ±.003	48.08 ±0.38	1.35 ±0.08	1.24
-033	AS568-033	2.018 ±.018	0.053 ±.003	0.049	0.087	0.045 ±.003	51.26 ±0.46	1.35 ±0.08	1.24
-034	AS568-034	2.143 ±.018	0.053 ±.003	0.049	0.087	0.045 ±.003	54.43 ±0.46	1.35 ±0.08	1.24
-035	AS568-035	2.268 ±.018	0.053 ±.003	0.049	0.087	0.045 ±.003	57.61 ±0.46	1.35 ±0.08	1.24
-036	AS568-036	2.393 ±.018	0.053 ±.003	0.049	0.087	0.045 ±.003	60.78 ±0.46	1.35 ±0.08	1.24
-037	AS568-037	2.518 ±.018	0.053 ±.003	0.049	0.087	0.045 ±.003	63.96 ±0.46	1.35 ±0.08	1.24
-038	AS568-038	2.643 ±.02	0.053 ±.003	0.049	0.087	0.045 ±.003	67.13 ±0.51	1.35 ±0.08	1.24
-039	AS568-039	2.768 ±.02	0.053 ±.003	0.049	0.087	0.045 ±.003	70.31 ±0.51	1.35 ±0.08	1.24
-040	AS568-040	2.893 ±.02	0.053 ±.003	0.049	0.087	0.045 ±.003	73.48 ±0.51	1.35 ±0.08	1.24
-041	AS568-041	3.018 ±.024	0.053 ±.003	0.049	0.087	0.045 ±.003	76.66 ±0.61	1.35 ±0.08	1.24
-042	AS568-042	3.268 ±.024	0.053 ±.003	0.049	0.087	0.045 ±.003	83.01 ±0.61	1.35 ±0.08	1.24
-043	AS568-043	3.518 ±.024	0.053 ±.003	0.049	0.087	0.045 ±.003	89.36 ±0.61	1.35 ±0.08	1.24
-044	AS568-044	3.768 ±.027	0.053 ±.003	0.049	0.087	0.045 ±.003	95.71 ±0.69	1.35 ±0.08	1.24
-045	AS568-045	4.018 ±.027	0.053 ±.003	0.049	0.087	0.045 ±.003	102.06 ±0.69	1.35 ±0.08	1.24
-046	AS568-046	4.268 ±.03	0.053 ±.003	0.049	0.087	0.045 ±.003	108.41 ±0.76	1.35 ±0.08	1.24
-047	AS568-047	4.518 ±.03	0.053 ±.003	0.049	0.087	0.045 ±.003	114.76 ±0.76	1.35 ±0.08	1.24
-048	AS568-048	4.768 ±.03	0.053 ±.003	0.049	0.087	0.045 ±.003	121.11 ±0.76	1.35 ±0.08	1.24
-049	AS568-049	5.018 ±.037	0.053 ±.003	0.049	0.087	0.045 ±.003	127.46 ±0.94	1.35 ±0.08	1.24
-050	AS568-050	5.268 ±.037	0.053 ±.003	0.049	0.087	0.045 ±.003	133.81 ±0.94	1.35 ±0.08	1.24

1xx series

77 sizes

AS568 Backup 1xx series size table
Dash	Code	ID (in)	W (in)	HT (in)	Contour R (in)	Contour HT (in)	ID (mm)	W (mm)	HT (mm)
-102	AS568-102	0.077 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	1.96 ±0.13	2.18 ±0.08	1.35
-103	AS568-103	0.109 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	2.77 ±0.13	2.18 ±0.08	1.35
-104	AS568-104	0.140 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	3.56 ±0.13	2.18 ±0.08	1.35
-105	AS568-105	0.171 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	4.34 ±0.13	2.18 ±0.08	1.35
-106	AS568-106	0.202 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	5.13 ±0.13	2.18 ±0.08	1.35
-107	AS568-107	0.234 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	5.94 ±0.13	2.18 ±0.08	1.35
-108	AS568-108	0.265 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	6.73 ±0.13	2.18 ±0.08	1.35
-109	AS568-109	0.327 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	8.31 ±0.13	2.18 ±0.08	1.35
-110	AS568-110	0.390 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	9.91 ±0.13	2.18 ±0.08	1.35
-111	AS568-111	0.452 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	11.48 ±0.13	2.18 ±0.08	1.35
-112	AS568-112	0.515 ±.005	0.086 ±.003	0.053	0.129	0.045 ±.003	13.08 ±0.13	2.18 ±0.08	1.35
-113	AS568-113	0.577 ±.007	0.086 ±.003	0.053	0.129	0.045 ±.003	14.66 ±0.18	2.18 ±0.08	1.35
-114	AS568-114	0.640 ±.009	0.086 ±.003	0.053	0.129	0.045 ±.003	16.26 ±0.23	2.18 ±0.08	1.35
-115	AS568-115	0.702 ±.009	0.086 ±.003	0.053	0.129	0.045 ±.003	17.83 ±0.23	2.18 ±0.08	1.35
-116	AS568-116	0.765 ±.009	0.086 ±.003	0.053	0.129	0.045 ±.003	19.43 ±0.23	2.18 ±0.08	1.35
-117	AS568-117	0.831 ±.01	0.086 ±.003	0.053	0.129	0.045 ±.003	21.11 ±0.25	2.18 ±0.08	1.35
-118	AS568-118	0.893 ±.01	0.086 ±.003	0.053	0.129	0.045 ±.003	22.68 ±0.25	2.18 ±0.08	1.35
-119	AS568-119	0.956 ±.01	0.086 ±.003	0.053	0.129	0.045 ±.003	24.28 ±0.25	2.18 ±0.08	1.35
-120	AS568-120	1.018 ±.01	0.086 ±.003	0.053	0.129	0.045 ±.003	25.86 ±0.25	2.18 ±0.08	1.35
-121	AS568-121	1.081 ±.01	0.086 ±.003	0.053	0.129	0.045 ±.003	27.46 ±0.25	2.18 ±0.08	1.35
-122	AS568-122	1.143 ±.01	0.086 ±.003	0.053	0.129	0.045 ±.003	29.03 ±0.25	2.18 ±0.08	1.35
-123	AS568-123	1.206 ±.012	0.086 ±.003	0.053	0.129	0.045 ±.003	30.63 ±0.30	2.18 ±0.08	1.35
-124	AS568-124	1.268 ±.012	0.086 ±.003	0.053	0.129	0.045 ±.003	32.21 ±0.30	2.18 ±0.08	1.35
-125	AS568-125	1.331 ±.012	0.086 ±.003	0.053	0.129	0.045 ±.003	33.81 ±0.30	2.18 ±0.08	1.35
-126	AS568-126	1.393 ±.012	0.086 ±.003	0.053	0.129	0.045 ±.003	35.38 ±0.30	2.18 ±0.08	1.35
-127	AS568-127	1.456 ±.012	0.086 ±.003	0.053	0.129	0.045 ±.003	36.98 ±0.30	2.18 ±0.08	1.35
-128	AS568-128	1.518 ±.012	0.086 ±.003	0.053	0.129	0.045 ±.003	38.56 ±0.30	2.18 ±0.08	1.35
-129	AS568-129	1.581 ±.015	0.086 ±.003	0.053	0.129	0.045 ±.003	40.16 ±0.38	2.18 ±0.08	1.35
-130	AS568-130	1.643 ±.015	0.086 ±.003	0.053	0.129	0.045 ±.003	41.73 ±0.38	2.18 ±0.08	1.35
-131	AS568-131	1.706 ±.015	0.086 ±.003	0.053	0.129	0.045 ±.003	43.33 ±0.38	2.18 ±0.08	1.35
-132	AS568-132	1.768 ±.015	0.086 ±.003	0.053	0.129	0.045 ±.003	44.91 ±0.38	2.18 ±0.08	1.35
-133	AS568-133	1.831 ±.015	0.086 ±.003	0.053	0.129	0.045 ±.003	46.51 ±0.38	2.18 ±0.08	1.35
-134	AS568-134	1.893 ±.015	0.086 ±.003	0.053	0.129	0.045 ±.003	48.08 ±0.38	2.18 ±0.08	1.35
-135	AS568-135	1.956 ±.017	0.086 ±.003	0.053	0.129	0.045 ±.003	49.68 ±0.43	2.18 ±0.08	1.35
-136	AS568-136	2.018 ±.017	0.086 ±.003	0.053	0.129	0.045 ±.003	51.26 ±0.43	2.18 ±0.08	1.35
-137	AS568-137	2.081 ±.017	0.086 ±.003	0.053	0.129	0.045 ±.003	52.86 ±0.43	2.18 ±0.08	1.35
-138	AS568-138	2.143 ±.017	0.086 ±.003	0.053	0.129	0.045 ±.003	54.43 ±0.43	2.18 ±0.08	1.35
-139	AS568-139	2.206 ±.017	0.086 ±.003	0.053	0.129	0.045 ±.003	56.03 ±0.43	2.18 ±0.08	1.35
-140	AS568-140	2.268 ±.017	0.086 ±.003	0.053	0.129	0.045 ±.003	57.61 ±0.43	2.18 ±0.08	1.35
-141	AS568-141	2.331 ±.02	0.086 ±.003	0.053	0.129	0.045 ±.003	59.21 ±0.51	2.18 ±0.08	1.35
-142	AS568-142	2.393 ±.02	0.086 ±.003	0.053	0.129	0.045 ±.003	60.78 ±0.51	2.18 ±0.08	1.35
-143	AS568-143	2.456 ±.02	0.086 ±.003	0.053	0.129	0.045 ±.003	62.38 ±0.51	2.18 ±0.08	1.35
-144	AS568-144	2.518 ±.02	0.086 ±.003	0.053	0.129	0.045 ±.003	63.96 ±0.51	2.18 ±0.08	1.35
-145	AS568-145	2.581 ±.02	0.086 ±.003	0.053	0.129	0.045 ±.003	65.56 ±0.51	2.18 ±0.08	1.35
-146	AS568-146	2.643 ±.02	0.086 ±.003	0.053	0.129	0.045 ±.003	67.13 ±0.51	2.18 ±0.08	1.35
-147	AS568-147	2.706 ±.022	0.086 ±.003	0.053	0.129	0.045 ±.003	68.73 ±0.56	2.18 ±0.08	1.35
-148	AS568-148	2.768 ±.022	0.086 ±.003	0.053	0.129	0.045 ±.003	70.31 ±0.56	2.18 ±0.08	1.35
-149	AS568-149	2.831 ±.022	0.086 ±.003	0.053	0.129	0.045 ±.003	71.91 ±0.56	2.18 ±0.08	1.35
-150	AS568-150	2.893 ±.022	0.086 ±.003	0.053	0.129	0.045 ±.003	73.48 ±0.56	2.18 ±0.08	1.35
-151	AS568-151	3.018 ±.024	0.086 ±.003	0.053	0.129	0.045 ±.003	76.66 ±0.61	2.18 ±0.08	1.35
-152	AS568-152	3.268 ±.024	0.086 ±.003	0.053	0.129	0.045 ±.003	83.01 ±0.61	2.18 ±0.08	1.35
-153	AS568-153	3.518 ±.024	0.086 ±.003	0.053	0.129	0.045 ±.003	89.36 ±0.61	2.18 ±0.08	1.35
-154	AS568-154	3.768 ±.028	0.086 ±.003	0.053	0.129	0.045 ±.003	95.71 ±0.71	2.18 ±0.08	1.35
-155	AS568-155	4.018 ±.028	0.086 ±.003	0.053	0.129	0.045 ±.003	102.06 ±0.71	2.18 ±0.08	1.35
-156	AS568-156	4.268 ±.03	0.086 ±.003	0.053	0.129	0.045 ±.003	108.41 ±0.76	2.18 ±0.08	1.35
-157	AS568-157	4.518 ±.03	0.086 ±.003	0.053	0.129	0.045 ±.003	114.76 ±0.76	2.18 ±0.08	1.35
-158	AS568-158	4.768 ±.03	0.086 ±.003	0.053	0.129	0.045 ±.003	121.11 ±0.76	2.18 ±0.08	1.35
-159	AS568-159	5.018 ±.035	0.086 ±.003	0.053	0.129	0.045 ±.003	127.46 ±0.89	2.18 ±0.08	1.35
-160	AS568-160	5.268 ±.035	0.086 ±.003	0.053	0.129	0.045 ±.003	133.81 ±0.89	2.18 ±0.08	1.35
-161	AS568-161	5.518 ±.035	0.086 ±.003	0.053	0.129	0.045 ±.003	140.16 ±0.89	2.18 ±0.08	1.35
-162	AS568-162	5.768 ±.035	0.086 ±.003	0.053	0.129	0.045 ±.003	146.51 ±0.89	2.18 ±0.08	1.35
-163	AS568-163	6.018 ±.035	0.086 ±.003	0.053	0.129	0.045 ±.003	152.86 ±0.89	2.18 ±0.08	1.35
-164	AS568-164	6.268 ±.04	0.086 ±.003	0.053	0.129	0.045 ±.003	159.21 ±1.02	2.18 ±0.08	1.35
-165	AS568-165	6.518 ±.04	0.086 ±.003	0.053	0.129	0.045 ±.003	165.56 ±1.02	2.18 ±0.08	1.35
-166	AS568-166	6.768 ±.04	0.086 ±.003	0.053	0.129	0.045 ±.003	171.91 ±1.02	2.18 ±0.08	1.35
-167	AS568-167	7.018 ±.04	0.086 ±.003	0.053	0.129	0.045 ±.003	178.26 ±1.02	2.18 ±0.08	1.35
-168	AS568-168	7.268 ±.045	0.086 ±.003	0.053	0.129	0.045 ±.003	184.61 ±1.14	2.18 ±0.08	1.35
-169	AS568-169	7.518 ±.045	0.086 ±.003	0.053	0.129	0.045 ±.003	190.96 ±1.14	2.18 ±0.08	1.35
-170	AS568-170	7.768 ±.045	0.086 ±.003	0.053	0.129	0.045 ±.003	197.31 ±1.14	2.18 ±0.08	1.35
-171	AS568-171	8.018 ±.045	0.086 ±.003	0.053	0.129	0.045 ±.003	203.66 ±1.14	2.18 ±0.08	1.35
-172	AS568-172	8.268 ±.05	0.086 ±.003	0.053	0.129	0.045 ±.003	210.01 ±1.27	2.18 ±0.08	1.35
-173	AS568-173	8.518 ±.05	0.086 ±.003	0.053	0.129	0.045 ±.003	216.36 ±1.27	2.18 ±0.08	1.35
-174	AS568-174	8.768 ±.05	0.086 ±.003	0.053	0.129	0.045 ±.003	222.71 ±1.27	2.18 ±0.08	1.35
-175	AS568-175	9.018 ±.05	0.086 ±.003	0.053	0.129	0.045 ±.003	229.06 ±1.27	2.18 ±0.08	1.35
-176	AS568-176	9.268 ±.055	0.086 ±.003	0.053	0.129	0.045 ±.003	235.41 ±1.40	2.18 ±0.08	1.35
-177	AS568-177	9.518 ±.055	0.086 ±.003	0.053	0.129	0.045 ±.003	241.76 ±1.40	2.18 ±0.08	1.35
-178	AS568-178	9.768 ±.055	0.086 ±.003	0.053	0.129	0.045 ±.003	248.11 ±1.40	2.18 ±0.08	1.35

2xx series

84 sizes

AS568 Backup 2xx series size table
Dash	Code	ID (in)	W (in)	HT (in)	Contour R (in)	Contour HT (in)	ID (mm)	W (mm)	HT (mm)
-201	AS568-201	0.202 ±.005	0.118 ±.004	0.050	0.174	0.040 ±.003	5.13 ±0.13	3.00 ±0.10	1.27
-202	AS568-202	0.265 ±.005	0.118 ±.004	0.050	0.174	0.040 ±.003	6.73 ±0.13	3.00 ±0.10	1.27
-203	AS568-203	0.327 ±.005	0.118 ±.004	0.050	0.174	0.040 ±.003	8.31 ±0.13	3.00 ±0.10	1.27
-204	AS568-204	0.390 ±.005	0.118 ±.004	0.050	0.174	0.040 ±.003	9.91 ±0.13	3.00 ±0.10	1.27
-205	AS568-205	0.455 ±.005	0.118 ±.004	0.050	0.174	0.040 ±.003	11.56 ±0.13	3.00 ±0.10	1.27
-206	AS568-206	0.518 ±.005	0.118 ±.004	0.050	0.174	0.040 ±.003	13.16 ±0.13	3.00 ±0.10	1.27
-207	AS568-207	0.580 ±.007	0.118 ±.004	0.050	0.174	0.040 ±.003	14.73 ±0.18	3.00 ±0.10	1.27
-208	AS568-208	0.643 ±.009	0.118 ±.004	0.050	0.174	0.040 ±.003	16.33 ±0.23	3.00 ±0.10	1.27
-209	AS568-209	0.705 ±.009	0.118 ±.004	0.050	0.174	0.040 ±.003	17.91 ±0.23	3.00 ±0.10	1.27
-210	AS568-210	0.766 ±.01	0.118 ±.004	0.050	0.174	0.040 ±.003	19.46 ±0.25	3.00 ±0.10	1.27
-211	AS568-211	0.828 ±.01	0.118 ±.004	0.050	0.174	0.040 ±.003	21.03 ±0.25	3.00 ±0.10	1.27
-212	AS568-212	0.891 ±.01	0.118 ±.004	0.050	0.174	0.040 ±.003	22.63 ±0.25	3.00 ±0.10	1.27
-213	AS568-213	0.953 ±.01	0.118 ±.004	0.050	0.174	0.040 ±.003	24.21 ±0.25	3.00 ±0.10	1.27
-214	AS568-214	1.016 ±.01	0.118 ±.004	0.050	0.174	0.040 ±.003	25.81 ±0.25	3.00 ±0.10	1.27
-215	AS568-215	1.078 ±.01	0.118 ±.004	0.050	0.174	0.040 ±.003	27.38 ±0.25	3.00 ±0.10	1.27
-216	AS568-216	1.141 ±.012	0.118 ±.004	0.050	0.174	0.040 ±.003	28.98 ±0.30	3.00 ±0.10	1.27
-217	AS568-217	1.203 ±.012	0.118 ±.004	0.050	0.174	0.040 ±.003	30.56 ±0.30	3.00 ±0.10	1.27
-218	AS568-218	1.266 ±.012	0.118 ±.004	0.050	0.174	0.040 ±.003	32.16 ±0.30	3.00 ±0.10	1.27
-219	AS568-219	1.334 ±.012	0.118 ±.004	0.050	0.174	0.040 ±.003	33.88 ±0.30	3.00 ±0.10	1.27
-220	AS568-220	1.397 ±.012	0.118 ±.004	0.050	0.174	0.040 ±.003	35.48 ±0.30	3.00 ±0.10	1.27
-221	AS568-221	1.459 ±.012	0.118 ±.004	0.050	0.174	0.040 ±.003	37.06 ±0.30	3.00 ±0.10	1.27
-222	AS568-222	1.522 ±.015	0.118 ±.004	0.050	0.174	0.040 ±.003	38.66 ±0.38	3.00 ±0.10	1.27
-223	AS568-223	1.647 ±.015	0.118 ±.004	0.050	0.174	0.040 ±.003	41.83 ±0.38	3.00 ±0.10	1.27
-224	AS568-224	1.772 ±.015	0.118 ±.004	0.050	0.174	0.040 ±.003	45.01 ±0.38	3.00 ±0.10	1.27
-225	AS568-225	1.897 ±.018	0.118 ±.004	0.050	0.174	0.040 ±.003	48.18 ±0.46	3.00 ±0.10	1.27
-226	AS568-226	2.022 ±.018	0.118 ±.004	0.050	0.174	0.040 ±.003	51.36 ±0.46	3.00 ±0.10	1.27
-227	AS568-227	2.147 ±.018	0.118 ±.004	0.050	0.174	0.040 ±.003	54.53 ±0.46	3.00 ±0.10	1.27
-228	AS568-228	2.272 ±.02	0.118 ±.004	0.050	0.174	0.040 ±.003	57.71 ±0.51	3.00 ±0.10	1.27
-229	AS568-229	2.397 ±.02	0.118 ±.004	0.050	0.174	0.040 ±.003	60.88 ±0.51	3.00 ±0.10	1.27
-230	AS568-230	2.522 ±.02	0.118 ±.004	0.050	0.174	0.040 ±.003	64.06 ±0.51	3.00 ±0.10	1.27
-231	AS568-231	2.631 ±.02	0.118 ±.004	0.050	0.174	0.040 ±.003	66.83 ±0.51	3.00 ±0.10	1.27
-232	AS568-232	2.756 ±.024	0.118 ±.004	0.050	0.174	0.040 ±.003	70.00 ±0.61	3.00 ±0.10	1.27
-233	AS568-233	2.881 ±.024	0.118 ±.004	0.050	0.174	0.040 ±.003	73.18 ±0.61	3.00 ±0.10	1.27
-234	AS568-234	3.006 ±.024	0.118 ±.004	0.050	0.174	0.040 ±.003	76.35 ±0.61	3.00 ±0.10	1.27
-235	AS568-235	3.131 ±.024	0.118 ±.004	0.050	0.174	0.040 ±.003	79.53 ±0.61	3.00 ±0.10	1.27
-236	AS568-236	3.256 ±.024	0.118 ±.004	0.050	0.174	0.040 ±.003	82.70 ±0.61	3.00 ±0.10	1.27
-237	AS568-237	3.381 ±.024	0.118 ±.004	0.050	0.174	0.040 ±.003	85.88 ±0.61	3.00 ±0.10	1.27
-238	AS568-238	3.506 ±.024	0.118 ±.004	0.050	0.174	0.040 ±.003	89.05 ±0.61	3.00 ±0.10	1.27
-239	AS568-239	3.631 ±.028	0.118 ±.004	0.050	0.174	0.040 ±.003	92.23 ±0.71	3.00 ±0.10	1.27
-240	AS568-240	3.756 ±.028	0.118 ±.004	0.050	0.174	0.040 ±.003	95.40 ±0.71	3.00 ±0.10	1.27
-241	AS568-241	3.881 ±.028	0.118 ±.004	0.050	0.174	0.040 ±.003	98.58 ±0.71	3.00 ±0.10	1.27
-242	AS568-242	4.006 ±.028	0.118 ±.004	0.050	0.174	0.040 ±.003	101.75 ±0.71	3.00 ±0.10	1.27
-243	AS568-243	4.131 ±.028	0.118 ±.004	0.050	0.174	0.040 ±.003	104.93 ±0.71	3.00 ±0.10	1.27
-244	AS568-244	4.256 ±.03	0.118 ±.004	0.050	0.174	0.040 ±.003	108.10 ±0.76	3.00 ±0.10	1.27
-245	AS568-245	4.381 ±.03	0.118 ±.004	0.050	0.174	0.040 ±.003	111.28 ±0.76	3.00 ±0.10	1.27
-246	AS568-246	4.506 ±.03	0.118 ±.004	0.050	0.174	0.040 ±.003	114.45 ±0.76	3.00 ±0.10	1.27
-247	AS568-247	4.631 ±.03	0.118 ±.004	0.050	0.174	0.040 ±.003	117.63 ±0.76	3.00 ±0.10	1.27
-248	AS568-248	4.768 ±.03	0.118 ±.004	0.050	0.174	0.040 ±.003	121.11 ±0.76	3.00 ±0.10	1.27
-249	AS568-249	4.893 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	124.28 ±0.89	3.00 ±0.10	1.27
-250	AS568-250	5.018 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	127.46 ±0.89	3.00 ±0.10	1.27
-251	AS568-251	5.143 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	130.63 ±0.89	3.00 ±0.10	1.27
-252	AS568-252	5.268 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	133.81 ±0.89	3.00 ±0.10	1.27
-253	AS568-253	5.393 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	136.98 ±0.89	3.00 ±0.10	1.27
-254	AS568-254	5.518 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	140.16 ±0.89	3.00 ±0.10	1.27
-255	AS568-255	5.643 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	143.33 ±0.89	3.00 ±0.10	1.27
-256	AS568-256	5.768 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	146.51 ±0.89	3.00 ±0.10	1.27
-257	AS568-257	5.893 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	149.68 ±0.89	3.00 ±0.10	1.27
-258	AS568-258	6.018 ±.035	0.118 ±.004	0.050	0.174	0.040 ±.003	152.86 ±0.89	3.00 ±0.10	1.27
-259	AS568-259	6.268 ±.04	0.118 ±.004	0.050	0.174	0.040 ±.003	159.21 ±1.02	3.00 ±0.10	1.27
-260	AS568-260	6.518 ±.04	0.118 ±.004	0.050	0.174	0.040 ±.003	165.56 ±1.02	3.00 ±0.10	1.27
-261	AS568-261	6.768 ±.04	0.118 ±.004	0.050	0.174	0.040 ±.003	171.91 ±1.02	3.00 ±0.10	1.27
-262	AS568-262	7.018 ±.04	0.118 ±.004	0.050	0.174	0.040 ±.003	178.26 ±1.02	3.00 ±0.10	1.27
-263	AS568-263	7.268 ±.045	0.118 ±.004	0.050	0.174	0.040 ±.003	184.61 ±1.14	3.00 ±0.10	1.27
-264	AS568-264	7.518 ±.045	0.118 ±.004	0.050	0.174	0.040 ±.003	190.96 ±1.14	3.00 ±0.10	1.27
-265	AS568-265	7.768 ±.045	0.118 ±.004	0.050	0.174	0.040 ±.003	197.31 ±1.14	3.00 ±0.10	1.27
-266	AS568-266	8.018 ±.045	0.118 ±.004	0.050	0.174	0.040 ±.003	203.66 ±1.14	3.00 ±0.10	1.27
-267	AS568-267	8.268 ±.05	0.118 ±.004	0.050	0.174	0.040 ±.003	210.01 ±1.27	3.00 ±0.10	1.27
-268	AS568-268	8.518 ±.05	0.118 ±.004	0.050	0.174	0.040 ±.003	216.36 ±1.27	3.00 ±0.10	1.27
-269	AS568-269	8.768 ±.05	0.118 ±.004	0.050	0.174	0.040 ±.003	222.71 ±1.27	3.00 ±0.10	1.27
-270	AS568-270	9.018 ±.05	0.118 ±.004	0.050	0.174	0.040 ±.003	229.06 ±1.27	3.00 ±0.10	1.27
-271	AS568-271	9.268 ±.055	0.118 ±.004	0.050	0.174	0.040 ±.003	235.41 ±1.40	3.00 ±0.10	1.27
-272	AS568-272	9.518 ±.055	0.118 ±.004	0.050	0.174	0.040 ±.003	241.76 ±1.40	3.00 ±0.10	1.27
-273	AS568-273	9.768 ±.055	0.118 ±.004	0.050	0.174	0.040 ±.003	248.11 ±1.40	3.00 ±0.10	1.27
-274	AS568-274	10.018 ±.055	0.118 ±.004	0.050	0.174	0.040 ±.003	254.46 ±1.40	3.00 ±0.10	1.27
-275	AS568-275	10.518 ±.055	0.118 ±.004	0.050	0.174	0.040 ±.003	267.16 ±1.40	3.00 ±0.10	1.27
-276	AS568-276	11.018 ±.065	0.118 ±.004	0.050	0.174	0.040 ±.003	279.86 ±1.65	3.00 ±0.10	1.27
-277	AS568-277	11.518 ±.065	0.118 ±.004	0.050	0.174	0.040 ±.003	292.56 ±1.65	3.00 ±0.10	1.27
-278	AS568-278	12.018 ±.065	0.118 ±.004	0.050	0.174	0.040 ±.003	305.26 ±1.65	3.00 ±0.10	1.27
-279	AS568-279	13.018 ±.065	0.118 ±.004	0.050	0.174	0.040 ±.003	330.66 ±1.65	3.00 ±0.10	1.27
-280	AS568-280	14.018 ±.065	0.118 ±.004	0.050	0.174	0.040 ±.003	356.06 ±1.65	3.00 ±0.10	1.27
-281	AS568-281	15.018 ±.065	0.118 ±.004	0.050	0.174	0.040 ±.003	381.46 ±1.65	3.00 ±0.10	1.27
-282	AS568-282	15.989 ±.075	0.118 ±.004	0.050	0.174	0.040 ±.003	406.12 ±1.90	3.00 ±0.10	1.27
-283	AS568-283	16.989 ±.08	0.118 ±.004	0.050	0.174	0.040 ±.003	431.52 ±2.03	3.00 ±0.10	1.27
-284	AS568-284	17.989 ±.085	0.118 ±.004	0.050	0.174	0.040 ±.003	456.92 ±2.16	3.00 ±0.10	1.27

3xx series

87 sizes

AS568 Backup 3xx series size table
Dash	Code	ID (in)	W (in)	HT (in)	Contour R (in)	Contour HT (in)	ID (mm)	W (mm)	HT (mm)
-309	AS568-309	0.450 ±.005	0.183 ±.005	0.076	0.262	0.060 ±.004	11.43 ±0.13	4.65 ±0.13	1.93
-310	AS568-310	0.513 ±.005	0.183 ±.005	0.076	0.262	0.060 ±.004	13.03 ±0.13	4.65 ±0.13	1.93
-311	AS568-311	0.575 ±.007	0.183 ±.005	0.076	0.262	0.060 ±.004	14.61 ±0.18	4.65 ±0.13	1.93
-312	AS568-312	0.638 ±.009	0.183 ±.005	0.076	0.262	0.060 ±.004	16.21 ±0.23	4.65 ±0.13	1.93
-313	AS568-313	0.700 ±.009	0.183 ±.005	0.076	0.262	0.060 ±.004	17.78 ±0.23	4.65 ±0.13	1.93
-314	AS568-314	0.763 ±.01	0.183 ±.005	0.076	0.262	0.060 ±.004	19.38 ±0.25	4.65 ±0.13	1.93
-315	AS568-315	0.825 ±.01	0.183 ±.005	0.076	0.262	0.060 ±.004	20.95 ±0.25	4.65 ±0.13	1.93
-316	AS568-316	0.888 ±.01	0.183 ±.005	0.076	0.262	0.060 ±.004	22.56 ±0.25	4.65 ±0.13	1.93
-317	AS568-317	0.950 ±.01	0.183 ±.005	0.076	0.262	0.060 ±.004	24.13 ±0.25	4.65 ±0.13	1.93
-318	AS568-318	1.013 ±.01	0.183 ±.005	0.076	0.262	0.060 ±.004	25.73 ±0.25	4.65 ±0.13	1.93
-319	AS568-319	1.075 ±.01	0.183 ±.005	0.076	0.262	0.060 ±.004	27.30 ±0.25	4.65 ±0.13	1.93
-320	AS568-320	1.138 ±.012	0.183 ±.005	0.076	0.262	0.060 ±.004	28.91 ±0.30	4.65 ±0.13	1.93
-321	AS568-321	1.200 ±.012	0.183 ±.005	0.076	0.262	0.060 ±.004	30.48 ±0.30	4.65 ±0.13	1.93
-322	AS568-322	1.263 ±.012	0.183 ±.005	0.076	0.262	0.060 ±.004	32.08 ±0.30	4.65 ±0.13	1.93
-323	AS568-323	1.316 ±.012	0.183 ±.005	0.076	0.262	0.060 ±.004	33.43 ±0.30	4.65 ±0.13	1.93
-324	AS568-324	1.388 ±.012	0.183 ±.005	0.076	0.262	0.060 ±.004	35.26 ±0.30	4.65 ±0.13	1.93
-325	AS568-325	1.513 ±.015	0.183 ±.005	0.076	0.262	0.060 ±.004	38.43 ±0.38	4.65 ±0.13	1.93
-326	AS568-326	1.638 ±.015	0.183 ±.005	0.076	0.262	0.060 ±.004	41.61 ±0.38	4.65 ±0.13	1.93
-327	AS568-327	1.763 ±.015	0.183 ±.005	0.076	0.262	0.060 ±.004	44.78 ±0.38	4.65 ±0.13	1.93
-328	AS568-328	1.888 ±.015	0.183 ±.005	0.076	0.262	0.060 ±.004	47.96 ±0.38	4.65 ±0.13	1.93
-329	AS568-329	2.013 ±.018	0.183 ±.005	0.076	0.262	0.060 ±.004	51.13 ±0.46	4.65 ±0.13	1.93
-330	AS568-330	2.138 ±.018	0.183 ±.005	0.076	0.262	0.060 ±.004	54.31 ±0.46	4.65 ±0.13	1.93
-331	AS568-331	2.268 ±.018	0.183 ±.005	0.076	0.262	0.060 ±.004	57.61 ±0.46	4.65 ±0.13	1.93
-332	AS568-332	2.393 ±.018	0.183 ±.005	0.076	0.262	0.060 ±.004	60.78 ±0.46	4.65 ±0.13	1.93
-333	AS568-333	2.518 ±.02	0.183 ±.005	0.076	0.262	0.060 ±.004	63.96 ±0.51	4.65 ±0.13	1.93
-334	AS568-334	2.643 ±.02	0.183 ±.005	0.076	0.262	0.060 ±.004	67.13 ±0.51	4.65 ±0.13	1.93
-335	AS568-335	2.768 ±.02	0.183 ±.005	0.076	0.262	0.060 ±.004	70.31 ±0.51	4.65 ±0.13	1.93
-336	AS568-336	2.893 ±.02	0.183 ±.005	0.076	0.262	0.060 ±.004	73.48 ±0.51	4.65 ±0.13	1.93
-337	AS568-337	3.018 ±.024	0.183 ±.005	0.076	0.262	0.060 ±.004	76.66 ±0.61	4.65 ±0.13	1.93
-338	AS568-338	3.143 ±.024	0.183 ±.005	0.076	0.262	0.060 ±.004	79.83 ±0.61	4.65 ±0.13	1.93
-339	AS568-339	3.273 ±.024	0.183 ±.005	0.076	0.262	0.060 ±.004	83.13 ±0.61	4.65 ±0.13	1.93
-340	AS568-340	3.398 ±.024	0.183 ±.005	0.076	0.262	0.060 ±.004	86.31 ±0.61	4.65 ±0.13	1.93
-341	AS568-341	3.523 ±.024	0.183 ±.005	0.076	0.262	0.060 ±.004	89.48 ±0.61	4.65 ±0.13	1.93
-342	AS568-342	3.648 ±.028	0.183 ±.005	0.076	0.262	0.060 ±.004	92.66 ±0.71	4.65 ±0.13	1.93
-343	AS568-343	3.773 ±.028	0.183 ±.005	0.076	0.262	0.060 ±.004	95.83 ±0.71	4.65 ±0.13	1.93
-344	AS568-344	3.898 ±.028	0.183 ±.005	0.076	0.262	0.060 ±.004	99.01 ±0.71	4.65 ±0.13	1.93
-345	AS568-345	4.028 ±.028	0.183 ±.005	0.076	0.262	0.060 ±.004	102.31 ±0.71	4.65 ±0.13	1.93
-346	AS568-346	4.153 ±.028	0.183 ±.005	0.076	0.262	0.060 ±.004	105.49 ±0.71	4.65 ±0.13	1.93
-347	AS568-347	4.278 ±.03	0.183 ±.005	0.076	0.262	0.060 ±.004	108.66 ±0.76	4.65 ±0.13	1.93
-348	AS568-348	4.403 ±.03	0.183 ±.005	0.076	0.262	0.060 ±.004	111.84 ±0.76	4.65 ±0.13	1.93
-349	AS568-349	4.528 ±.03	0.183 ±.005	0.076	0.262	0.060 ±.004	115.01 ±0.76	4.65 ±0.13	1.93
-350	AS568-350	4.653 ±.03	0.183 ±.005	0.076	0.262	0.060 ±.004	118.19 ±0.76	4.65 ±0.13	1.93
-351	AS568-351	4.778 ±.03	0.183 ±.005	0.076	0.262	0.060 ±.004	121.36 ±0.76	4.65 ±0.13	1.93
-352	AS568-352	4.903 ±.03	0.183 ±.005	0.076	0.262	0.060 ±.004	124.54 ±0.76	4.65 ±0.13	1.93
-353	AS568-353	5.028 ±.037	0.183 ±.005	0.076	0.262	0.060 ±.004	127.71 ±0.94	4.65 ±0.13	1.93
-354	AS568-354	5.153 ±.037	0.183 ±.005	0.076	0.262	0.060 ±.004	130.89 ±0.94	4.65 ±0.13	1.93
-355	AS568-355	5.278 ±.037	0.183 ±.005	0.076	0.262	0.060 ±.004	134.06 ±0.94	4.65 ±0.13	1.93
-356	AS568-356	5.403 ±.037	0.183 ±.005	0.076	0.262	0.060 ±.004	137.24 ±0.94	4.65 ±0.13	1.93
-357	AS568-357	5.528 ±.037	0.183 ±.005	0.076	0.262	0.060 ±.004	140.41 ±0.94	4.65 ±0.13	1.93
-358	AS568-358	5.653 ±.037	0.183 ±.005	0.076	0.262	0.060 ±.004	143.59 ±0.94	4.65 ±0.13	1.93
-359	AS568-359	5.778 ±.037	0.183 ±.005	0.076	0.262	0.060 ±.004	146.76 ±0.94	4.65 ±0.13	1.93
-360	AS568-360	5.903 ±.037	0.183 ±.005	0.076	0.262	0.060 ±.004	149.94 ±0.94	4.65 ±0.13	1.93
-361	AS568-361	6.028 ±.037	0.183 ±.005	0.076	0.262	0.060 ±.004	153.11 ±0.94	4.65 ±0.13	1.93
-362	AS568-362	6.278 ±.04	0.183 ±.005	0.076	0.262	0.060 ±.004	159.46 ±1.02	4.65 ±0.13	1.93
-363	AS568-363	6.528 ±.04	0.183 ±.005	0.076	0.262	0.060 ±.004	165.81 ±1.02	4.65 ±0.13	1.93
-364	AS568-364	6.778 ±.04	0.183 ±.005	0.076	0.262	0.060 ±.004	172.16 ±1.02	4.65 ±0.13	1.93
-365	AS568-365	7.028 ±.04	0.183 ±.005	0.076	0.262	0.060 ±.004	178.51 ±1.02	4.65 ±0.13	1.93
-366	AS568-366	7.278 ±.045	0.183 ±.005	0.076	0.262	0.060 ±.004	184.86 ±1.14	4.65 ±0.13	1.93
-367	AS568-367	7.528 ±.045	0.183 ±.005	0.076	0.262	0.060 ±.004	191.21 ±1.14	4.65 ±0.13	1.93
-368	AS568-368	7.778 ±.045	0.183 ±.005	0.076	0.262	0.060 ±.004	197.56 ±1.14	4.65 ±0.13	1.93
-369	AS568-369	8.028 ±.045	0.183 ±.005	0.076	0.262	0.060 ±.004	203.91 ±1.14	4.65 ±0.13	1.93
-370	AS568-370	8.278 ±.05	0.183 ±.005	0.076	0.262	0.060 ±.004	210.26 ±1.27	4.65 ±0.13	1.93
-371	AS568-371	8.528 ±.05	0.183 ±.005	0.076	0.262	0.060 ±.004	216.61 ±1.27	4.65 ±0.13	1.93
-372	AS568-372	8.778 ±.05	0.183 ±.005	0.076	0.262	0.060 ±.004	222.96 ±1.27	4.65 ±0.13	1.93
-373	AS568-373	9.028 ±.05	0.183 ±.005	0.076	0.262	0.060 ±.004	229.31 ±1.27	4.65 ±0.13	1.93
-374	AS568-374	9.278 ±.055	0.183 ±.005	0.076	0.262	0.060 ±.004	235.66 ±1.40	4.65 ±0.13	1.93
-375	AS568-375	9.528 ±.055	0.183 ±.005	0.076	0.262	0.060 ±.004	242.01 ±1.40	4.65 ±0.13	1.93
-376	AS568-376	9.778 ±.055	0.183 ±.005	0.076	0.262	0.060 ±.004	248.36 ±1.40	4.65 ±0.13	1.93
-377	AS568-377	10.028 ±.055	0.183 ±.005	0.076	0.262	0.060 ±.004	254.71 ±1.40	4.65 ±0.13	1.93
-378	AS568-378	10.528 ±.06	0.183 ±.005	0.076	0.262	0.060 ±.004	267.41 ±1.52	4.65 ±0.13	1.93
-379	AS568-379	11.028 ±.06	0.183 ±.005	0.076	0.262	0.060 ±.004	280.11 ±1.52	4.65 ±0.13	1.93
-380	AS568-380	11.528 ±.065	0.183 ±.005	0.076	0.262	0.060 ±.004	292.81 ±1.65	4.65 ±0.13	1.93
-381	AS568-381	12.028 ±.065	0.183 ±.005	0.076	0.262	0.060 ±.004	305.51 ±1.65	4.65 ±0.13	1.93
-382	AS568-382	13.028 ±.065	0.183 ±.005	0.076	0.262	0.060 ±.004	330.91 ±1.65	4.65 ±0.13	1.93
-383	AS568-383	14.028 ±.07	0.183 ±.005	0.076	0.262	0.060 ±.004	356.31 ±1.78	4.65 ±0.13	1.93
-384	AS568-384	15.028 ±.07	0.183 ±.005	0.076	0.262	0.060 ±.004	381.71 ±1.78	4.65 ±0.13	1.93
-385	AS568-385	16.008 ±.075	0.183 ±.005	0.076	0.262	0.060 ±.004	406.60 ±1.90	4.65 ±0.13	1.93
-386	AS568-386	17.008 ±.08	0.183 ±.005	0.076	0.262	0.060 ±.004	432.00 ±2.03	4.65 ±0.13	1.93
-387	AS568-387	18.008 ±.085	0.183 ±.005	0.076	0.262	0.060 ±.004	457.40 ±2.16	4.65 ±0.13	1.93
-388	AS568-388	19.006 ±.09	0.183 ±.005	0.076	0.262	0.060 ±.004	482.75 ±2.29	4.65 ±0.13	1.93
-389	AS568-389	20.006 ±.095	0.183 ±.005	0.076	0.262	0.060 ±.004	508.15 ±2.41	4.65 ±0.13	1.93
-390	AS568-390	21.006 ±.095	0.183 ±.005	0.076	0.262	0.060 ±.004	533.55 ±2.41	4.65 ±0.13	1.93
-391	AS568-391	22.006 ±.1	0.183 ±.005	0.076	0.262	0.060 ±.004	558.95 ±2.54	4.65 ±0.13	1.93
-392	AS568-392	22.993 ±.105	0.183 ±.005	0.076	0.262	0.060 ±.004	584.02 ±2.67	4.65 ±0.13	1.93
-393	AS568-393	23.993 ±.11	0.183 ±.005	0.076	0.262	0.060 ±.004	609.42 ±2.79	4.65 ±0.13	1.93
-394	AS568-394	24.993 ±.115	0.183 ±.005	0.076	0.262	0.060 ±.004	634.82 ±2.92	4.65 ±0.13	1.93
-395	AS568-395	25.993 ±.12	0.183 ±.005	0.076	0.262	0.060 ±.004	660.22 ±3.05	4.65 ±0.13	1.93

4xx series

51 sizes

AS568 Backup 4xx series size table
Dash	Code	ID (in)	W (in)	HT (in)	Contour R (in)	Contour HT (in)	ID (mm)	W (mm)	HT (mm)
-425	AS568-425	4.551 ±.033	0.236 ±.006	0.117	0.344	0.096 ±.005	115.60 ±0.84	5.99 ±0.15	2.97
-426	AS568-426	4.676 ±.033	0.236 ±.006	0.117	0.344	0.096 ±.005	118.77 ±0.84	5.99 ±0.15	2.97
-427	AS568-427	4.801 ±.033	0.236 ±.006	0.117	0.344	0.096 ±.005	121.95 ±0.84	5.99 ±0.15	2.97
-428	AS568-428	4.926 ±.033	0.236 ±.006	0.117	0.344	0.096 ±.005	125.12 ±0.84	5.99 ±0.15	2.97
-429	AS568-429	5.051 ±.037	0.236 ±.006	0.117	0.344	0.096 ±.005	128.30 ±0.94	5.99 ±0.15	2.97
-430	AS568-430	5.176 ±.037	0.236 ±.006	0.117	0.344	0.096 ±.005	131.47 ±0.94	5.99 ±0.15	2.97
-431	AS568-431	5.301 ±.037	0.236 ±.006	0.117	0.344	0.096 ±.005	134.65 ±0.94	5.99 ±0.15	2.97
-432	AS568-432	5.426 ±.037	0.236 ±.006	0.117	0.344	0.096 ±.005	137.82 ±0.94	5.99 ±0.15	2.97
-433	AS568-433	5.551 ±.037	0.236 ±.006	0.117	0.344	0.096 ±.005	141.00 ±0.94	5.99 ±0.15	2.97
-434	AS568-434	5.676 ±.037	0.236 ±.006	0.117	0.344	0.096 ±.005	144.17 ±0.94	5.99 ±0.15	2.97
-435	AS568-435	5.801 ±.037	0.236 ±.006	0.117	0.344	0.096 ±.005	147.35 ±0.94	5.99 ±0.15	2.97
-436	AS568-436	5.926 ±.037	0.236 ±.006	0.117	0.344	0.096 ±.005	150.52 ±0.94	5.99 ±0.15	2.97
-437	AS568-437	6.051 ±.037	0.236 ±.006	0.117	0.344	0.096 ±.005	153.70 ±0.94	5.99 ±0.15	2.97
-438	AS568-438	6.274 ±.04	0.236 ±.006	0.117	0.344	0.096 ±.005	159.36 ±1.02	5.99 ±0.15	2.97
-439	AS568-439	6.524 ±.04	0.236 ±.006	0.117	0.344	0.096 ±.005	165.71 ±1.02	5.99 ±0.15	2.97
-440	AS568-440	6.774 ±.04	0.236 ±.006	0.117	0.344	0.096 ±.005	172.06 ±1.02	5.99 ±0.15	2.97
-441	AS568-441	7.024 ±.04	0.236 ±.006	0.117	0.344	0.096 ±.005	178.41 ±1.02	5.99 ±0.15	2.97
-442	AS568-442	7.274 ±.045	0.236 ±.006	0.117	0.344	0.096 ±.005	184.76 ±1.14	5.99 ±0.15	2.97
-443	AS568-443	7.524 ±.045	0.236 ±.006	0.117	0.344	0.096 ±.005	191.11 ±1.14	5.99 ±0.15	2.97
-444	AS568-444	7.774 ±.045	0.236 ±.006	0.117	0.344	0.096 ±.005	197.46 ±1.14	5.99 ±0.15	2.97
-445	AS568-445	8.024 ±.045	0.236 ±.006	0.117	0.344	0.096 ±.005	203.81 ±1.14	5.99 ±0.15	2.97
-446	AS568-446	8.524 ±.055	0.236 ±.006	0.117	0.344	0.096 ±.005	216.51 ±1.40	5.99 ±0.15	2.97
-447	AS568-447	9.024 ±.055	0.236 ±.006	0.117	0.344	0.096 ±.005	229.21 ±1.40	5.99 ±0.15	2.97
-448	AS568-448	9.524 ±.055	0.236 ±.006	0.117	0.344	0.096 ±.005	241.91 ±1.40	5.99 ±0.15	2.97
-449	AS568-449	10.024 ±.055	0.236 ±.006	0.117	0.344	0.096 ±.005	254.61 ±1.40	5.99 ±0.15	2.97
-450	AS568-450	10.524 ±.06	0.236 ±.006	0.117	0.344	0.096 ±.005	267.31 ±1.52	5.99 ±0.15	2.97
-451	AS568-451	11.024 ±.06	0.236 ±.006	0.117	0.344	0.096 ±.005	280.01 ±1.52	5.99 ±0.15	2.97
-452	AS568-452	11.524 ±.06	0.236 ±.006	0.117	0.344	0.096 ±.005	292.71 ±1.52	5.99 ±0.15	2.97
-453	AS568-453	12.024 ±.06	0.236 ±.006	0.117	0.344	0.096 ±.005	305.41 ±1.52	5.99 ±0.15	2.97
-454	AS568-454	12.524 ±.06	0.236 ±.006	0.117	0.344	0.096 ±.005	318.11 ±1.52	5.99 ±0.15	2.97
-455	AS568-455	13.024 ±.06	0.236 ±.006	0.117	0.344	0.096 ±.005	330.81 ±1.52	5.99 ±0.15	2.97
-456	AS568-456	13.524 ±.07	0.236 ±.006	0.117	0.344	0.096 ±.005	343.51 ±1.78	5.99 ±0.15	2.97
-457	AS568-457	14.024 ±.07	0.236 ±.006	0.117	0.344	0.096 ±.005	356.21 ±1.78	5.99 ±0.15	2.97
-458	AS568-458	14.524 ±.07	0.236 ±.006	0.117	0.344	0.096 ±.005	368.91 ±1.78	5.99 ±0.15	2.97
-459	AS568-459	15.024 ±.07	0.236 ±.006	0.117	0.344	0.096 ±.005	381.61 ±1.78	5.99 ±0.15	2.97
-460	AS568-460	15.524 ±.07	0.236 ±.006	0.117	0.344	0.096 ±.005	394.31 ±1.78	5.99 ±0.15	2.97
-461	AS568-461	16.004 ±.075	0.236 ±.006	0.117	0.344	0.096 ±.005	406.50 ±1.90	5.99 ±0.15	2.97
-462	AS568-462	16.504 ±.075	0.236 ±.006	0.117	0.344	0.096 ±.005	419.20 ±1.90	5.99 ±0.15	2.97
-463	AS568-463	17.004 ±.08	0.236 ±.006	0.117	0.344	0.096 ±.005	431.90 ±2.03	5.99 ±0.15	2.97
-464	AS568-464	17.504 ±.085	0.236 ±.006	0.117	0.344	0.096 ±.005	444.60 ±2.16	5.99 ±0.15	2.97
-465	AS568-465	18.004 ±.085	0.236 ±.006	0.117	0.344	0.096 ±.005	457.30 ±2.16	5.99 ±0.15	2.97
-466	AS568-466	18.504 ±.085	0.236 ±.006	0.117	0.344	0.096 ±.005	470.00 ±2.16	5.99 ±0.15	2.97
-467	AS568-467	19.004 ±.09	0.236 ±.006	0.117	0.344	0.096 ±.005	482.70 ±2.29	5.99 ±0.15	2.97
-468	AS568-468	19.504 ±.09	0.236 ±.006	0.117	0.344	0.096 ±.005	495.40 ±2.29	5.99 ±0.15	2.97
-469	AS568-469	20.004 ±.095	0.236 ±.006	0.117	0.344	0.096 ±.005	508.10 ±2.41	5.99 ±0.15	2.97
-470	AS568-470	21.004 ±.095	0.236 ±.006	0.117	0.344	0.096 ±.005	533.50 ±2.41	5.99 ±0.15	2.97
-471	AS568-471	22.004 ±.1	0.236 ±.006	0.117	0.344	0.096 ±.005	558.90 ±2.54	5.99 ±0.15	2.97
-472	AS568-472	23.004 ±.105	0.236 ±.006	0.117	0.344	0.096 ±.005	584.30 ±2.67	5.99 ±0.15	2.97
-473	AS568-473	24.004 ±.11	0.236 ±.006	0.117	0.344	0.096 ±.005	609.70 ±2.79	5.99 ±0.15	2.97
-474	AS568-474	25.004 ±.115	0.236 ±.006	0.117	0.344	0.096 ±.005	635.10 ±2.92	5.99 ±0.15	2.97
-475	AS568-475	26.004 ±.12	0.236 ±.006	0.117	0.344	0.096 ±.005	660.50 ±3.05	5.99 ±0.15	2.97

When to use a back-up ring

System pressure is roughly above 1,500 psi, or the extrusion gap is large
Temperature softens the O-Ring and raises extrusion risk
You need longer seal life without tightening hardware clearances

Pressure direction: one ring on the low-pressure side for unidirectional pressure; two rings (one on each side) for bidirectional or unknown pressure. The gland must be wider than a standard O-Ring groove.

See Back-Up Rings and Shore A Hardness.

Other size charts

Need	Chart
AS568 dash (0xx-4xx)	AS568 O-Ring Size Chart
Metric / ISO 3601	Metric O-Ring Size Chart
JIS S/P/G/V	JIS B 2401 Size Chart
ORB / 900-series boss	ORB Boss Size Chart
Back-up rings	Backup Ring Size Chart
DIN 3771	DIN 3771 Size Chart
Generic Metric	Generic Metric Size Chart
BS 4518	BS 4518 Size Chart
BS 1806	BS 1806 Size Chart
NF T 47-501	NF T 47-501 Size Chart
SMS 1586	SMS 1586 Size Chart
X-Ring	X-Ring Size Chart
Square Ring	Square Ring Size Chart
Parker 500	Parker 500 Size Chart
ISO 6149 ports	ISO 6149 Size Chart
Search across standards	Master O-Ring Size Chart

History and explanation of AS568 back-up rings

What a back-up ring is

A back-up ring is a hard washer-like ring (elastomer, PTFE, or other anti-extrusion material) that fills the extrusion gap so the softer O-Ring cannot flow out under pressure. It does not replace the O-Ring; it protects it.

Why AS568 dashes are reused

Back-up rings are ordered to the same dash as the O-Ring they protect. That keeps BOMs simple: if the seal is -214, the back-up is also -214 geometry (with back-up-specific width/height/contour).

AS568 itself remains a size language. Material (NBR, FKM, PTFE, and so on) is a separate callout.

Contoured vs flat

Many industrial charts list contoured back-up geometry (radius and contour height) for better support against the O-Ring. Flat back-ups still appear in some kits. Match the style your gland and OEM drawing call for.

Using this chart

Find the O-Ring dash.
Read ID / W / HT (and contour if required).
Confirm one-side vs two-side installation and gland width.
Order the matching back-up material for temperature and fluid.

Backup Ring Size Chart (AS568)

0xx series

1xx series

2xx series

3xx series

4xx series

When to use a back-up ring

Other size charts

History and explanation of AS568 back-up rings

What a back-up ring is

Why AS568 dashes are reused

Contoured vs flat

Using this chart

Handbook

The O-Ring Store

Get In Touch

0xx series

1xx series

2xx series

3xx series

4xx series

When to use a back-up ring

Other size charts

Related

History and explanation of AS568 back-up rings

What a back-up ring is

Why AS568 dashes are reused

Contoured vs flat

Using this chart

Handbook

The O-Ring Store

Get In Touch