AS568 O-Ring Size Chart: Every Dash Number in Inch & mm

An AS568 o-ring is named by a dash number whose first digit gives the cross-section: -004 to -050 are 0.070 in (1.78 mm), -102 to -178 are 0.103 in (2.62 mm), -201 to -284 are 0.139 in (3.53 mm), -309 to -395 are 0.210 in (5.33 mm) and -425 to -475 are 0.275 in (6.99 mm). For example, AS568-214 is 0.984 ± 0.010 in inside diameter × 0.139 ± 0.004 in section (24.99 × 3.53 mm). The tables below list all 350 sizes from -001 to -475 and the 20 boss seals from -901 to -932, transcribed from Apple Rubber's published AS568 table (the SAE AS568 standard itself is sold by SAE). Millimetre values are the inch values × 25.4, not ISO 3601 metric sizes. To convert other dimensions use the Unit Converter; to design the groove, see O-Ring Groove Dimensions.

Cross-section by dash-number series

Dash numbers	Cross-section (in)	Tolerance (in)	Cross-section (mm)
-001 to -003	.040 / .050 / .060	±.003	1.02 / 1.27 / 1.52
-004 to -050	.070	±.003	1.78
-102 to -178	.103	±.003	2.62
-201 to -284	.139	±.004	3.53
-309 to -395	.210	±.005	5.33
-425 to -475	.275	±.006	6.99

How to read the size tables

ID and cross-section are the actual moulded dimensions with their ± tolerance. Inside-diameter tolerance widens as the ring gets bigger: ±0.004 in on the smallest sizes up to ±0.120 in on -475 (25.940 in ID).
OD ref. is the inside diameter plus twice the cross-section, a reference value as Apple Rubber prints it in its gland tables (for -004: 0.070 + 2 × 0.070 = 0.210 in). It is not separately toleranced.
Nominal size is the traditional fractional name (ID × OD × width). It is rounded, and sometimes the actual ID is smaller than the nominal by more than the tolerance (-214: nominal 1 in, actual 0.984 in), so never machine a groove from the nominal size. Where the source leaves a nominal value blank it is shown as —.
Cross-section tolerances in the source: ±0.003 in up to 0.104 in, ±0.004 in at 0.139 in, ±0.005 in at 0.210 in, ±0.006 in at 0.275 in (and ±0.008 in at 0.375 in for non-AS568 sizes).
Material. Apple Rubber's listed sizes are based on 70 durometer nitrile. Every compound shrinks when moulded and some shrink more, so a ring in another material may come from different tooling; ask the maker for the size in your compound.
Ordering (Apple Rubber's format): quantity, AS568 dash number, then durometer and material code, for example AS568-110 70SL for 70 durometer silicone. Non-standard rings are ordered by ID × cross-section.

-001 to -050: 0.070 in (1.78 mm) cross-section and the three small sections

AS568 dash no.	ID (in)	Cross-section (in)	OD ref. (in)	ID (mm)	Cross-section (mm)	Nominal ID × OD × width (in)
-001	.029 ±.004	.040 ±.003	.109	0.74 ±0.10	1.02 ±0.08	1/32 × 3/32 × 1/32
-001 1/2	.070 ±.004	.040 ±.003	.150	1.78 ±0.10	1.02 ±0.08	1/16 × 1/8 × 1/32
-002	.042 ±.004	.050 ±.003	.142	1.07 ±0.10	1.27 ±0.08	3/64 × 9/64 × 3/64
-003	.056 ±.004	.060 ±.003	.176	1.42 ±0.10	1.52 ±0.08	1/16 × 3/16 × 1/16
-004	.070 ±.005	.070 ±.003	.210	1.78 ±0.13	1.78 ±0.08	5/64 × 13/64 × 1/16
-005	.101 ±.005	.070 ±.003	.241	2.57 ±0.13	1.78 ±0.08	3/32 × 7/32 × 1/16
-006	.114 ±.005	.070 ±.003	.254	2.90 ±0.13	1.78 ±0.08	1/8 × 1/4 × 1/16
-007	.145 ±.005	.070 ±.003	.285	3.68 ±0.13	1.78 ±0.08	5/32 × 9/32 × 1/16
-008	.176 ±.005	.070 ±.003	.316	4.47 ±0.13	1.78 ±0.08	3/16 × 5/16 × 1/16
-009	.208 ±.005	.070 ±.003	.348	5.28 ±0.13	1.78 ±0.08	7/32 × 11/32 × 1/16
-010	.239 ±.005	.070 ±.003	.379	6.07 ±0.13	1.78 ±0.08	1/4 × 3/8 × 1/16
-011	.301 ±.005	.070 ±.003	.441	7.65 ±0.13	1.78 ±0.08	5/16 × 7/16 × 1/16
-012	.364 ±.005	.070 ±.003	.504	9.25 ±0.13	1.78 ±0.08	3/8 × 1/2 × 1/16
-013	.426 ±.005	.070 ±.003	.566	10.82 ±0.13	1.78 ±0.08	7/16 × 9/16 × 1/16
-014	.489 ±.005	.070 ±.003	.629	12.42 ±0.13	1.78 ±0.08	1/2 × 5/8 × 1/16
-015	.551 ±.007	.070 ±.003	.691	14.00 ±0.18	1.78 ±0.08	9/16 × 11/16 × 1/16
-016	.614 ±.009	.070 ±.003	.754	15.60 ±0.23	1.78 ±0.08	5/8 × 3/4 × 1/16
-017	.676 ±.009	.070 ±.003	.816	17.17 ±0.23	1.78 ±0.08	11/16 × 13/16 × 1/16
-018	.739 ±.009	.070 ±.003	.879	18.77 ±0.23	1.78 ±0.08	3/4 × 7/8 × 1/16
-019	.801 ±.009	.070 ±.003	.941	20.35 ±0.23	1.78 ±0.08	13/16 × 15/16 × 1/16
-020	.864 ±.009	.070 ±.003	1.004	21.95 ±0.23	1.78 ±0.08	7/8 × 1 × 1/16
-021	.926 ±.009	.070 ±.003	1.066	23.52 ±0.23	1.78 ±0.08	15/16 × 1 1/16 × 1/16
-022	.989 ±.010	.070 ±.003	1.129	25.12 ±0.25	1.78 ±0.08	1 × 1 1/8 × 1/16
-023	1.051 ±.010	.070 ±.003	1.191	26.70 ±0.25	1.78 ±0.08	1 1/16 × 1 3/16 × 1/16
-024	1.114 ±.010	.070 ±.003	1.254	28.30 ±0.25	1.78 ±0.08	1 1/8 × 1 1/4 × 1/16
-025	1.176 ±.011	.070 ±.003	1.316	29.87 ±0.28	1.78 ±0.08	1 3/16 × 1 5/16 × 1/16
-026	1.239 ±.011	.070 ±.003	1.379	31.47 ±0.28	1.78 ±0.08	1 1/4 × 1 3/8 × 1/16
-027	1.301 ±.011	.070 ±.003	1.441	33.05 ±0.28	1.78 ±0.08	1 5/16 × 1 7/16 × 1/16
-028	1.364 ±.013	.070 ±.003	1.504	34.65 ±0.33	1.78 ±0.08	1 3/8 × 1 1/2 × 1/16
-029	1.489 ±.013	.070 ±.003	1.629	37.82 ±0.33	1.78 ±0.08	1 1/2 × 1 5/8 × 1/16
-030	1.614 ±.013	.070 ±.003	1.754	41.00 ±0.33	1.78 ±0.08	1 5/8 × 1 3/4 × 1/16
-031	1.739 ±.015	.070 ±.003	1.879	44.17 ±0.38	1.78 ±0.08	1 3/4 × 1 7/8 × 1/16
-032	1.864 ±.015	.070 ±.003	2.004	47.35 ±0.38	1.78 ±0.08	1 7/8 × 2 × 1/16
-033	1.989 ±.018	.070 ±.003	2.129	50.52 ±0.46	1.78 ±0.08	2 × 2 1/8 × 1/16
-034	2.114 ±.018	.070 ±.003	2.254	53.70 ±0.46	1.78 ±0.08	2 1/8 × 2 1/4 × 1/16
-035	2.239 ±.018	.070 ±.003	2.379	56.87 ±0.46	1.78 ±0.08	2 1/4 × 2 3/8 × 1/16
-036	2.364 ±.018	.070 ±.003	2.504	60.05 ±0.46	1.78 ±0.08	2 3/8 × 2 1/2 × 1/16
-037	2.489 ±.018	.070 ±.003	2.629	63.22 ±0.46	1.78 ±0.08	2 1/2 × 2 5/8 × 1/16
-038	2.614 ±.020	.070 ±.003	2.754	66.40 ±0.51	1.78 ±0.08	2 5/8 × 2 3/4 × 1/16
-039	2.739 ±.020	.070 ±.003	2.879	69.57 ±0.51	1.78 ±0.08	2 3/4 × 2 7/8 × 1/16
-040	2.864 ±.020	.070 ±.003	3.004	72.75 ±0.51	1.78 ±0.08	2 7/8 × 3 × 1/16
-041	2.989 ±.024	.070 ±.003	3.129	75.92 ±0.61	1.78 ±0.08	3 × 3 1/8 × 1/16
-042	3.239 ±.024	.070 ±.003	3.379	82.27 ±0.61	1.78 ±0.08	3 1/4 × 3 3/8 × 1/16
-043	3.489 ±.024	.070 ±.003	3.629	88.62 ±0.61	1.78 ±0.08	3 1/2 × 3 5/8 × 1/16
-044	3.739 ±.027	.070 ±.003	3.879	94.97 ±0.69	1.78 ±0.08	3 3/4 × 3 7/8 × 1/16
-045	3.989 ±.027	.070 ±.003	4.129	101.32 ±0.69	1.78 ±0.08	4 × 4 1/8 × 1/16
-046	4.239 ±.030	.070 ±.003	4.379	107.67 ±0.76	1.78 ±0.08	4 1/4 × 4 3/8 × 1/16
-047	4.489 ±.030	.070 ±.003	4.629	114.02 ±0.76	1.78 ±0.08	4 1/2 × 4 5/8 × 1/16
-048	4.739 ±.030	.070 ±.003	4.879	120.37 ±0.76	1.78 ±0.08	4 3/4 × 4 7/8 × 1/16
-049	4.989 ±.037	.070 ±.003	5.129	126.72 ±0.94	1.78 ±0.08	5 × 5 1/8 × 1/16
-050	5.239 ±.037	.070 ±.003	5.379	133.07 ±0.94	1.78 ±0.08	5 1/4 × 5 3/8 × 1/16

-102 to -178: 0.103 in (2.62 mm) cross-section

AS568 dash no.	ID (in)	Cross-section (in)	OD ref. (in)	ID (mm)	Cross-section (mm)	Nominal ID × OD × width (in)
-102	.049 ±.005	.103 ±.003	.255	1.24 ±0.13	2.62 ±0.08	1/16 × 1/4 × 3/32
-103	.081 ±.005	.103 ±.003	.287	2.06 ±0.13	2.62 ±0.08	3/32 × 9/32 × 3/32
-104	.112 ±.005	.103 ±.003	.318	2.84 ±0.13	2.62 ±0.08	1/8 × 5/16 × 3/32
-105	.143 ±.005	.103 ±.003	.349	3.63 ±0.13	2.62 ±0.08	5/32 × 11/32 × 3/32
-106	.174 ±.005	.103 ±.003	.380	4.42 ±0.13	2.62 ±0.08	3/16 × 3/8 × 3/32
-107	.206 ±.005	.103 ±.003	.412	5.23 ±0.13	2.62 ±0.08	7/32 × 13/32 × 3/32
-108	.237 ±.005	.103 ±.003	.443	6.02 ±0.13	2.62 ±0.08	1/4 × 7/16 × 3/32
-109	.299 ±.005	.103 ±.003	.505	7.59 ±0.13	2.62 ±0.08	5/16 × 1/2 × 3/32
-110	.362 ±.005	.103 ±.003	.568	9.19 ±0.13	2.62 ±0.08	3/8 × 9/16 × 3/32
-111	.424 ±.005	.103 ±.003	.630	10.77 ±0.13	2.62 ±0.08	7/16 × 5/8 × 3/32
-112	.487 ±.005	.103 ±.003	.693	12.37 ±0.13	2.62 ±0.08	1/2 × 11/16 × 3/32
-113	.549 ±.007	.103 ±.003	.755	13.94 ±0.18	2.62 ±0.08	9/16 × 3/4 × 3/32
-114	.612 ±.009	.103 ±.003	.818	15.54 ±0.23	2.62 ±0.08	5/8 × 13/16 × 3/32
-115	.674 ±.009	.103 ±.003	.880	17.12 ±0.23	2.62 ±0.08	11/16 × 7/8 × 3/32
-116	.737 ±.009	.103 ±.003	.943	18.72 ±0.23	2.62 ±0.08	3/4 × 15/16 × 3/32
-117	.799 ±.010	.103 ±.003	1.005	20.29 ±0.25	2.62 ±0.08	13/16 × 1 × 3/32
-118	.862 ±.010	.103 ±.003	1.068	21.89 ±0.25	2.62 ±0.08	7/8 × 1 1/16 × 3/32
-119	.924 ±.010	.103 ±.003	1.130	23.47 ±0.25	2.62 ±0.08	15/16 × 1 1/8 × 3/32
-120	.987 ±.010	.103 ±.003	1.193	25.07 ±0.25	2.62 ±0.08	1 × 1 3/16 × 3/32
-121	1.049 ±.010	.103 ±.003	1.255	26.64 ±0.25	2.62 ±0.08	1 1/16 × 1 1/4 × 3/32
-122	1.112 ±.010	.103 ±.003	1.318	28.24 ±0.25	2.62 ±0.08	1 1/8 × 1 5/16 × 3/32
-123	1.174 ±.012	.103 ±.003	1.380	29.82 ±0.30	2.62 ±0.08	1 3/16 × 1 3/8 × 3/32
-124	1.237 ±.012	.103 ±.003	1.443	31.42 ±0.30	2.62 ±0.08	1 1/4 × 1 7/16 × 3/32
-125	1.299 ±.012	.103 ±.003	1.505	32.99 ±0.30	2.62 ±0.08	1 5/16 × 1 1/2 × 3/32
-126	1.362 ±.012	.103 ±.003	1.568	34.59 ±0.30	2.62 ±0.08	1 3/8 × 1 9/16 × 3/32
-127	1.424 ±.012	.103 ±.003	1.630	36.17 ±0.30	2.62 ±0.08	1 7/16 × 1 5/8 × 3/32
-128	1.487 ±.012	.103 ±.003	1.693	37.77 ±0.30	2.62 ±0.08	1 1/2 × 1 11/16 × 3/32
-129	1.549 ±.015	.103 ±.003	1.755	39.34 ±0.38	2.62 ±0.08	1 9/16 × 1 3/4 × 3/32
-130	1.612 ±.015	.103 ±.003	1.818	40.94 ±0.38	2.62 ±0.08	1 5/8 × 1 13/16 × 3/32
-131	1.674 ±.015	.103 ±.003	1.880	42.52 ±0.38	2.62 ±0.08	1 11/16 × 1 7/8 × 3/32
-132	1.737 ±.015	.103 ±.003	1.943	44.12 ±0.38	2.62 ±0.08	1 3/4 × 1 15/16 × 3/32
-133	1.799 ±.015	.103 ±.003	2.005	45.69 ±0.38	2.62 ±0.08	1 13/16 × 2 × 3/32
-134	1.862 ±.015	.103 ±.003	2.068	47.29 ±0.38	2.62 ±0.08	1 7/8 × 2 1/16 × 3/32
-135	1.925 ±.017	.103 ±.003	2.131	48.90 ±0.43	2.62 ±0.08	1 15/16 × 2 1/8 × 3/32
-136	1.987 ±.017	.103 ±.003	2.193	50.47 ±0.43	2.62 ±0.08	2 × 2 3/16 × 3/32
-137	2.050 ±.017	.103 ±.003	2.256	52.07 ±0.43	2.62 ±0.08	2 1/16 × 2 1/4 × 3/32
-138	2.112 ±.017	.103 ±.003	2.318	53.64 ±0.43	2.62 ±0.08	2 1/8 × 2 5/16 × 3/32
-139	2.175 ±.017	.103 ±.003	2.381	55.25 ±0.43	2.62 ±0.08	2 3/16 × 2 3/8 × 3/32
-140	2.237 ±.017	.103 ±.003	2.443	56.82 ±0.43	2.62 ±0.08	2 1/4 × 2 7/16 × 3/32
-141	2.300 ±.020	.103 ±.003	2.506	58.42 ±0.51	2.62 ±0.08	2 5/16 × 2 1/2 × 3/32
-142	2.362 ±.020	.103 ±.003	2.568	59.99 ±0.51	2.62 ±0.08	2 3/8 × 2 9/16 × 3/32
-143	2.425 ±.020	.103 ±.003	2.631	61.60 ±0.51	2.62 ±0.08	2 7/16 × 2 5/8 × 3/32
-144	2.487 ±.020	.103 ±.003	2.693	63.17 ±0.51	2.62 ±0.08	2 1/2 × 2 11/16 × 3/32
-145	2.550 ±.020	.103 ±.003	2.756	64.77 ±0.51	2.62 ±0.08	2 9/16 × 2 3/4 × 3/32
-146	2.612 ±.020	.103 ±.003	2.818	66.34 ±0.51	2.62 ±0.08	2 5/8 × 2 13/16 × 3/32
-147	2.675 ±.022	.103 ±.003	2.881	67.95 ±0.56	2.62 ±0.08	2 11/16 × 2 7/8 × 3/32
-148	2.737 ±.022	.103 ±.003	2.943	69.52 ±0.56	2.62 ±0.08	2 3/4 × 2 15/16 × 3/32
-149	2.800 ±.022	.103 ±.003	3.006	71.12 ±0.56	2.62 ±0.08	2 13/16 × 3 × 3/32
-150	2.862 ±.022	.103 ±.003	3.068	72.69 ±0.56	2.62 ±0.08	2 7/8 × 3 1/16 × 3/32
-151	2.987 ±.024	.103 ±.003	3.193	75.87 ±0.61	2.62 ±0.08	3 × 3 3/16 × 3/32
-152	3.237 ±.024	.103 ±.003	3.443	82.22 ±0.61	2.62 ±0.08	3 1/4 × 3 7/16 × 3/32
-153	3.487 ±.024	.103 ±.003	3.693	88.57 ±0.61	2.62 ±0.08	3 1/2 × 3 11/16 × 3/32
-154	3.737 ±.028	.103 ±.003	3.943	94.92 ±0.71	2.62 ±0.08	3 3/4 × 3 15/16 × 3/32
-155	3.987 ±.028	.103 ±.003	4.193	101.27 ±0.71	2.62 ±0.08	4 × 4 3/16 × 3/32
-156	4.237 ±.030	.103 ±.003	4.443	107.62 ±0.76	2.62 ±0.08	4 1/4 × 4 7/16 × 3/32
-157	4.487 ±.030	.103 ±.003	4.693	113.97 ±0.76	2.62 ±0.08	4 1/2 × 4 11/16 × 3/32
-158	4.737 ±.030	.103 ±.003	4.943	120.32 ±0.76	2.62 ±0.08	4 3/4 × 4 15/16 × 3/32
-159	4.987 ±.035	.103 ±.003	5.193	126.67 ±0.89	2.62 ±0.08	5 × 5 3/16 × 3/32
-160	5.237 ±.035	.103 ±.003	5.443	133.02 ±0.89	2.62 ±0.08	5 1/4 × 5 7/16 × 3/32
-161	5.487 ±.035	.103 ±.003	5.693	139.37 ±0.89	2.62 ±0.08	5 1/2 × 5 11/16 × 3/32
-162	5.737 ±.035	.103 ±.003	5.943	145.72 ±0.89	2.62 ±0.08	5 3/4 × 5 15/16 × 3/32
-163	5.987 ±.035	.103 ±.003	6.193	152.07 ±0.89	2.62 ±0.08	6 × 6 3/16 × 3/32
-164	6.237 ±.040	.103 ±.003	6.443	158.42 ±1.02	2.62 ±0.08	6 1/4 × 6 7/16 × 3/32
-165	6.487 ±.040	.103 ±.003	6.693	164.77 ±1.02	2.62 ±0.08	6 1/2 × 6 11/16 × 3/32
-166	6.737 ±.040	.103 ±.003	6.943	171.12 ±1.02	2.62 ±0.08	6 3/4 × 6 15/16 × 3/32
-167	6.987 ±.040	.103 ±.003	7.193	177.47 ±1.02	2.62 ±0.08	7 × 7 3/16 × 3/32
-168	7.237 ±.045	.103 ±.003	7.443	183.82 ±1.14	2.62 ±0.08	7 1/4 × 7 7/16 × 3/32
-169	7.487 ±.045	.103 ±.003	7.693	190.17 ±1.14	2.62 ±0.08	7 1/2 × 7 11/16 × 3/32
-170	7.737 ±.045	.103 ±.003	7.943	196.52 ±1.14	2.62 ±0.08	7 3/4 × 7 15/16 × 3/32
-171	7.987 ±.045	.103 ±.003	8.193	202.87 ±1.14	2.62 ±0.08	8 × 8 3/16 × 3/32
-172	8.237 ±.050	.103 ±.003	8.443	209.22 ±1.27	2.62 ±0.08	8 1/4 × 8 7/16 × 3/32
-173	8.487 ±.050	.103 ±.003	8.693	215.57 ±1.27	2.62 ±0.08	8 1/2 × 8 11/16 × 3/32
-174	8.737 ±.050	.103 ±.003	8.943	221.92 ±1.27	2.62 ±0.08	8 3/4 × 8 15/16 × 3/32
-175	8.987 ±.050	.103 ±.003	9.193	228.27 ±1.27	2.62 ±0.08	9 × 9 3/16 × 3/32
-176	9.237 ±.055	.103 ±.003	9.443	234.62 ±1.40	2.62 ±0.08	9 1/4 × 9 7/16 × 3/32
-177	9.487 ±.055	.103 ±.003	9.693	240.97 ±1.40	2.62 ±0.08	9 1/2 × 9 11/16 × 3/32
-178	9.737 ±.055	.103 ±.003	9.943	247.32 ±1.40	2.62 ±0.08	9 3/4 × 9 15/16 × 3/32

-201 to -284: 0.139 in (3.53 mm) cross-section

AS568 dash no.	ID (in)	Cross-section (in)	OD ref. (in)	ID (mm)	Cross-section (mm)	Nominal ID × OD × width (in)
-201	.171 ±.005	.139 ±.004	.449	4.34 ±0.13	3.53 ±0.10	3/16 × 7/16 × 1/8
-202	.234 ±.005	.139 ±.004	.512	5.94 ±0.13	3.53 ±0.10	1/4 × 1/2 × 1/8
-203	.296 ±.005	.139 ±.004	.574	7.52 ±0.13	3.53 ±0.10	5/16 × 9/16 × 1/8
-204	.359 ±.005	.139 ±.004	.637	9.12 ±0.13	3.53 ±0.10	3/8 × 5/8 × 1/8
-205	.421 ±.005	.139 ±.004	.699	10.69 ±0.13	3.53 ±0.10	7/16 × 11/16 × 1/8
-206	.484 ±.005	.139 ±.004	.762	12.29 ±0.13	3.53 ±0.10	1/2 × 3/4 × 1/8
-207	.546 ±.007	.139 ±.004	.824	13.87 ±0.18	3.53 ±0.10	9/16 × 13/16 × 1/8
-208	.609 ±.009	.139 ±.004	.887	15.47 ±0.23	3.53 ±0.10	5/8 × 7/8 × 1/8
-209	.671 ±.009	.139 ±.004	.949	17.04 ±0.23	3.53 ±0.10	11/16 × 15/16 × 1/8
-210	.734 ±.010	.139 ±.004	1.012	18.64 ±0.25	3.53 ±0.10	3/4 × 1 × 1/8
-211	.796 ±.010	.139 ±.004	1.074	20.22 ±0.25	3.53 ±0.10	13/16 × 1 1/16 × 1/8
-212	.859 ±.010	.139 ±.004	1.137	21.82 ±0.25	3.53 ±0.10	7/8 × 1 1/8 × 1/8
-213	.921 ±.010	.139 ±.004	1.199	23.39 ±0.25	3.53 ±0.10	15/16 × 1 3/16 × 1/8
-214	.984 ±.010	.139 ±.004	1.262	24.99 ±0.25	3.53 ±0.10	1 × 1 1/4 × 1/8
-215	1.046 ±.010	.139 ±.004	1.324	26.57 ±0.25	3.53 ±0.10	1 1/16 × 1 5/16 × 1/8
-216	1.109 ±.012	.139 ±.004	1.387	28.17 ±0.30	3.53 ±0.10	1 1/8 × 1 3/8 × 1/8
-217	1.171 ±.012	.139 ±.004	1.449	29.74 ±0.30	3.53 ±0.10	1 3/16 × 1 7/16 × 1/8
-218	1.234 ±.012	.139 ±.004	1.512	31.34 ±0.30	3.53 ±0.10	1 1/4 × 1 1/2 × 1/8
-219	1.296 ±.012	.139 ±.004	1.574	32.92 ±0.30	3.53 ±0.10	1 5/16 × 1 9/16 × 1/8
-220	1.359 ±.012	.139 ±.004	1.637	34.52 ±0.30	3.53 ±0.10	1 3/8 × 1 5/8 × 1/8
-221	1.421 ±.012	.139 ±.004	1.699	36.09 ±0.30	3.53 ±0.10	1 7/16 × 1 11/16 × 1/8
-222	1.484 ±.015	.139 ±.004	1.762	37.69 ±0.38	3.53 ±0.10	1 1/2 × 1 3/4 × 1/8
-223	1.609 ±.015	.139 ±.004	1.887	40.87 ±0.38	3.53 ±0.10	1 5/8 × 1 7/8 × 1/8
-224	1.734 ±.015	.139 ±.004	2.012	44.04 ±0.38	3.53 ±0.10	1 3/4 × 2 × 1/8
-225	1.859 ±.018	.139 ±.004	2.137	47.22 ±0.46	3.53 ±0.10	1 7/8 × 2 1/8 × 1/8
-226	1.984 ±.018	.139 ±.004	2.262	50.39 ±0.46	3.53 ±0.10	2 × 2 1/4 × 1/8
-227	2.109 ±.018	.139 ±.004	2.387	53.57 ±0.46	3.53 ±0.10	2 1/8 × 2 3/8 × 1/8
-228	2.234 ±.020	.139 ±.004	2.512	56.74 ±0.51	3.53 ±0.10	2 1/4 × 2 1/2 × 1/8
-229	2.359 ±.020	.139 ±.004	2.637	59.92 ±0.51	3.53 ±0.10	2 3/8 × 2 5/8 × 1/8
-230	2.484 ±.020	.139 ±.004	2.762	63.09 ±0.51	3.53 ±0.10	2 1/2 × 2 3/4 × 1/8
-231	2.609 ±.020	.139 ±.004	2.887	66.27 ±0.51	3.53 ±0.10	2 5/8 × 2 7/8 × 1/8
-232	2.734 ±.024	.139 ±.004	3.012	69.44 ±0.61	3.53 ±0.10	2 3/4 × 3 × 1/8
-233	2.859 ±.024	.139 ±.004	3.137	72.62 ±0.61	3.53 ±0.10	2 7/8 × 3 1/8 × 1/8
-234	2.984 ±.024	.139 ±.004	3.262	75.79 ±0.61	3.53 ±0.10	3 × 3 1/4 × 1/8
-235	3.109 ±.024	.139 ±.004	3.387	78.97 ±0.61	3.53 ±0.10	3 1/8 × 3 3/8 × 1/8
-236	3.234 ±.024	.139 ±.004	3.512	82.14 ±0.61	3.53 ±0.10	3 1/4 × 3 1/2 × 1/8
-237	3.359 ±.024	.139 ±.004	3.637	85.32 ±0.61	3.53 ±0.10	3 3/8 × 3 5/8 × 1/8
-238	3.484 ±.024	.139 ±.004	3.762	88.49 ±0.61	3.53 ±0.10	3 1/2 × 3 3/4 × 1/8
-239	3.609 ±.028	.139 ±.004	3.887	91.67 ±0.71	3.53 ±0.10	3 5/8 × 3 7/8 × 1/8
-240	3.734 ±.028	.139 ±.004	4.012	94.84 ±0.71	3.53 ±0.10	3 3/4 × 4 × 1/8
-241	3.859 ±.028	.139 ±.004	4.137	98.02 ±0.71	3.53 ±0.10	3 7/8 × 4 1/8 × 1/8
-242	3.984 ±.028	.139 ±.004	4.262	101.19 ±0.71	3.53 ±0.10	4 × 4 1/4 × 1/8
-243	4.109 ±.028	.139 ±.004	4.387	104.37 ±0.71	3.53 ±0.10	4 1/8 × 4 3/8 × 1/8
-244	4.234 ±.030	.139 ±.004	4.512	107.54 ±0.76	3.53 ±0.10	4 1/4 × 4 1/2 × 1/8
-245	4.359 ±.030	.139 ±.004	4.637	110.72 ±0.76	3.53 ±0.10	4 3/8 × 4 5/8 × 1/8
-246	4.484 ±.030	.139 ±.004	4.762	113.89 ±0.76	3.53 ±0.10	4 1/2 × 4 3/4 × 1/8
-247	4.609 ±.030	.139 ±.004	4.887	117.07 ±0.76	3.53 ±0.10	4 5/8 × 4 7/8 × 1/8
-248	4.734 ±.030	.139 ±.004	5.012	120.24 ±0.76	3.53 ±0.10	4 3/4 × 5 × 1/8
-249	4.859 ±.035	.139 ±.004	5.137	123.42 ±0.89	3.53 ±0.10	4 7/8 × 5 1/8 × 1/8
-250	4.984 ±.035	.139 ±.004	5.262	126.59 ±0.89	3.53 ±0.10	5 × 5 1/4 × 1/8
-251	5.109 ±.035	.139 ±.004	5.387	129.77 ±0.89	3.53 ±0.10	5 1/8 × 5 3/8 × 1/8
-252	5.234 ±.035	.139 ±.004	5.512	132.94 ±0.89	3.53 ±0.10	5 1/4 × 5 1/2 × 1/8
-253	5.359 ±.035	.139 ±.004	5.637	136.12 ±0.89	3.53 ±0.10	5 3/8 × 5 5/8 × 1/8
-254	5.484 ±.035	.139 ±.004	5.762	139.29 ±0.89	3.53 ±0.10	5 1/2 × 5 3/4 × 1/8
-255	5.609 ±.035	.139 ±.004	5.887	142.47 ±0.89	3.53 ±0.10	5 5/8 × 5 7/8 × 1/8
-256	5.734 ±.035	.139 ±.004	6.012	145.64 ±0.89	3.53 ±0.10	5 3/4 × 6 × 1/8
-257	5.859 ±.035	.139 ±.004	6.137	148.82 ±0.89	3.53 ±0.10	5 7/8 × 6 1/8 × 1/8
-258	5.984 ±.035	.139 ±.004	6.262	151.99 ±0.89	3.53 ±0.10	6 × 6 1/4 × 1/8
-259	6.234 ±.040	.139 ±.004	6.512	158.34 ±1.02	3.53 ±0.10	6 1/4 × 6 1/2 × 1/8
-260	6.484 ±.040	.139 ±.004	6.762	164.69 ±1.02	3.53 ±0.10	6 1/2 × 6 3/4 × 1/8
-261	6.734 ±.040	.139 ±.004	7.012	171.04 ±1.02	3.53 ±0.10	6 3/4 × 7 × 1/8
-262	6.984 ±.040	.139 ±.004	7.262	177.39 ±1.02	3.53 ±0.10	7 × 7 1/4 × 1/8
-263	7.234 ±.045	.139 ±.004	7.512	183.74 ±1.14	3.53 ±0.10	7 1/4 × 7 1/2 × 1/8
-264	7.484 ±.045	.139 ±.004	7.762	190.09 ±1.14	3.53 ±0.10	7 1/2 × 7 3/4 × 1/8
-265	7.734 ±.045	.139 ±.004	8.012	196.44 ±1.14	3.53 ±0.10	7 3/4 × 8 × 1/8
-266	7.984 ±.045	.139 ±.004	8.262	202.79 ±1.14	3.53 ±0.10	8 × 8 1/4 × 1/8
-267	8.234 ±.050	.139 ±.004	8.512	209.14 ±1.27	3.53 ±0.10	8 1/4 × 8 1/2 × 1/8
-268	8.484 ±.050	.139 ±.004	8.762	215.49 ±1.27	3.53 ±0.10	8 1/2 × 8 3/4 × 1/8
-269	8.734 ±.050	.139 ±.004	9.012	221.84 ±1.27	3.53 ±0.10	8 3/4 × 9 × 1/8
-270	8.984 ±.050	.139 ±.004	9.262	228.19 ±1.27	3.53 ±0.10	9 × 9 1/4 × 1/8
-271	9.234 ±.055	.139 ±.004	9.512	234.54 ±1.40	3.53 ±0.10	9 1/4 × 9 1/2 × 1/8
-272	9.484 ±.055	.139 ±.004	9.762	240.89 ±1.40	3.53 ±0.10	9 1/2 × 9 3/4 × 1/8
-273	9.734 ±.055	.139 ±.004	10.012	247.24 ±1.40	3.53 ±0.10	9 3/4 × 10 × 1/8
-274	9.984 ±.055	.139 ±.004	10.262	253.59 ±1.40	3.53 ±0.10	10 × 10 1/4 × 1/8
-275	10.484 ±.055	.139 ±.004	10.762	266.29 ±1.40	3.53 ±0.10	10 1/2 × 10 3/4 × 1/8
-276	10.984 ±.065	.139 ±.004	11.262	278.99 ±1.65	3.53 ±0.10	11 × 11 1/4 × 1/8
-277	11.484 ±.065	.139 ±.004	11.762	291.69 ±1.65	3.53 ±0.10	11 1/2 × 11 3/4 × 1/8
-278	11.984 ±.065	.139 ±.004	12.262	304.39 ±1.65	3.53 ±0.10	12 × 12 1/4 × 1/8
-279	12.984 ±.065	.139 ±.004	13.262	329.79 ±1.65	3.53 ±0.10	13 × 13 1/4 × 1/8
-280	13.984 ±.065	.139 ±.004	14.262	355.19 ±1.65	3.53 ±0.10	14 × 14 1/4 × 1/8
-281	14.984 ±.065	.139 ±.004	15.262	380.59 ±1.65	3.53 ±0.10	15 × 15 1/4 × 1/8
-282	15.955 ±.075	.139 ±.004	16.233	405.26 ±1.91	3.53 ±0.10	16 × 16 1/4 × 1/8
-283	16.955 ±.080	.139 ±.004	17.233	430.66 ±2.03	3.53 ±0.10	17 × 17 1/4 × 1/8
-284	17.955 ±.085	.139 ±.004	18.233	456.06 ±2.16	3.53 ±0.10	18 × 18 1/4 × 1/8

-309 to -395: 0.210 in (5.33 mm) cross-section

AS568 dash no.	ID (in)	Cross-section (in)	OD ref. (in)	ID (mm)	Cross-section (mm)	Nominal ID × OD × width (in)
-309	.412 ±.005	.210 ±.005	.832	10.46 ±0.13	5.33 ±0.13	7/16 × 13/16 × 3/16
-310	.475 ±.005	.210 ±.005	.895	12.07 ±0.13	5.33 ±0.13	1/2 × 7/8 × 3/16
-311	.537 ±.007	.210 ±.005	.957	13.64 ±0.18	5.33 ±0.13	9/16 × 15/16 × 3/16
-312	.600 ±.009	.210 ±.005	1.020	15.24 ±0.23	5.33 ±0.13	5/8 × 1 × 3/16
-313	.662 ±.009	.210 ±.005	1.082	16.81 ±0.23	5.33 ±0.13	11/16 × 1 1/16 × 3/16
-314	.725 ±.010	.210 ±.005	1.145	18.42 ±0.25	5.33 ±0.13	3/4 × 1 1/8 × 3/16
-315	.787 ±.010	.210 ±.005	1.207	19.99 ±0.25	5.33 ±0.13	13/16 × 1 3/16 × 3/16
-316	.850 ±.010	.210 ±.005	1.270	21.59 ±0.25	5.33 ±0.13	7/8 × 1 1/4 × 3/16
-317	.912 ±.010	.210 ±.005	1.332	23.16 ±0.25	5.33 ±0.13	15/16 × 1 5/16 × 3/16
-318	.975 ±.010	.210 ±.005	1.395	24.77 ±0.25	5.33 ±0.13	1 × 1 3/8 × 3/16
-319	1.037 ±.010	.210 ±.005	1.457	26.34 ±0.25	5.33 ±0.13	1 1/16 × 1 7/16 × 3/16
-320	1.100 ±.012	.210 ±.005	1.520	27.94 ±0.30	5.33 ±0.13	1 1/8 × 1 1/2 × 3/16
-321	1.162 ±.012	.210 ±.005	1.582	29.51 ±0.30	5.33 ±0.13	1 3/16 × 1 9/16 × 3/16
-322	1.225 ±.012	.210 ±.005	1.645	31.12 ±0.30	5.33 ±0.13	1 1/4 × 1 5/8 × 3/16
-323	1.287 ±.012	.210 ±.005	1.707	32.69 ±0.30	5.33 ±0.13	1 5/16 × — × 3/16
-324	1.350 ±.012	.210 ±.005	1.770	34.29 ±0.30	5.33 ±0.13	1 3/8 × 1 3/4 × 3/16
-325	1.475 ±.015	.210 ±.005	1.895	37.47 ±0.38	5.33 ±0.13	1 1/2 × 1 7/8 × 3/16
-326	1.600 ±.015	.210 ±.005	2.020	40.64 ±0.38	5.33 ±0.13	1 5/8 × 2 × 3/16
-327	1.725 ±.015	.210 ±.005	2.145	43.82 ±0.38	5.33 ±0.13	1 3/4 × 2 1/8 × 3/16
-328	1.850 ±.015	.210 ±.005	2.270	46.99 ±0.38	5.33 ±0.13	1 7/8 × 2 1/4 × 3/16
-329	1.975 ±.018	.210 ±.005	2.395	50.17 ±0.46	5.33 ±0.13	2 × 2 3/8 × 3/16
-330	2.100 ±.018	.210 ±.005	2.520	53.34 ±0.46	5.33 ±0.13	2 1/8 × 2 1/2 × 3/16
-331	2.225 ±.018	.210 ±.005	2.645	56.52 ±0.46	5.33 ±0.13	2 1/4 × 2 5/8 × 3/16
-332	2.350 ±.018	.210 ±.005	2.770	59.69 ±0.46	5.33 ±0.13	2 3/8 × 2 3/4 × 3/16
-333	2.475 ±.020	.210 ±.005	2.895	62.87 ±0.51	5.33 ±0.13	2 1/2 × 2 7/8 × 3/16
-334	2.600 ±.020	.210 ±.005	3.020	66.04 ±0.51	5.33 ±0.13	2 5/8 × 3 × 3/16
-335	2.725 ±.020	.210 ±.005	3.145	69.22 ±0.51	5.33 ±0.13	2 3/4 × 3 1/8 × 3/16
-336	2.850 ±.020	.210 ±.005	3.270	72.39 ±0.51	5.33 ±0.13	2 7/8 × 3 1/4 × 3/16
-337	2.975 ±.024	.210 ±.005	3.395	75.57 ±0.61	5.33 ±0.13	3 × 3 3/8 × 3/16
-338	3.100 ±.024	.210 ±.005	3.520	78.74 ±0.61	5.33 ±0.13	3 1/8 × 3 1/2 × 3/16
-339	3.225 ±.024	.210 ±.005	3.645	81.92 ±0.61	5.33 ±0.13	3 1/4 × 3 5/8 × 3/16
-340	3.350 ±.024	.210 ±.005	3.770	85.09 ±0.61	5.33 ±0.13	3 3/8 × 3 3/4 × 3/16
-341	3.475 ±.024	.210 ±.005	3.895	88.27 ±0.61	5.33 ±0.13	3 1/2 × 3 7/8 × 3/16
-342	3.600 ±.028	.210 ±.005	4.020	91.44 ±0.71	5.33 ±0.13	3 5/8 × 4 × 3/16
-343	3.725 ±.028	.210 ±.005	4.145	94.62 ±0.71	5.33 ±0.13	3 3/4 × 4 1/8 × 3/16
-344	3.850 ±.028	.210 ±.005	4.270	97.79 ±0.71	5.33 ±0.13	3 7/8 × 4 1/4 × 3/16
-345	3.975 ±.028	.210 ±.005	4.395	100.97 ±0.71	5.33 ±0.13	4 × 4 3/8 × 3/16
-346	4.100 ±.028	.210 ±.005	4.520	104.14 ±0.71	5.33 ±0.13	4 1/8 × 4 1/2 × 3/16
-347	4.225 ±.030	.210 ±.005	4.645	107.32 ±0.76	5.33 ±0.13	4 1/4 × 4 5/8 × 3/16
-348	4.350 ±.030	.210 ±.005	4.770	110.49 ±0.76	5.33 ±0.13	4 3/8 × 4 3/4 × 3/16
-349	4.475 ±.030	.210 ±.005	4.895	113.67 ±0.76	5.33 ±0.13	4 1/2 × 4 7/8 × 3/16
-350	4.600 ±.030	.210 ±.005	5.020	116.84 ±0.76	5.33 ±0.13	4 5/8 × 5 × 3/16
-351	4.725 ±.030	.210 ±.005	5.145	120.02 ±0.76	5.33 ±0.13	4 3/4 × 5 1/8 × 3/16
-352	4.850 ±.030	.210 ±.005	5.270	123.19 ±0.76	5.33 ±0.13	4 7/8 × 5 1/4 × 3/16
-353	4.975 ±.037	.210 ±.005	5.395	126.37 ±0.94	5.33 ±0.13	5 × 5 3/8 × 3/16
-354	5.100 ±.037	.210 ±.005	5.520	129.54 ±0.94	5.33 ±0.13	5 1/8 × 5 1/2 × 3/16
-355	5.225 ±.037	.210 ±.005	5.645	132.72 ±0.94	5.33 ±0.13	5 1/4 × 5 5/8 × 3/16
-356	5.350 ±.037	.210 ±.005	5.770	135.89 ±0.94	5.33 ±0.13	5 3/8 × 5 3/4 × 3/16
-357	5.475 ±.037	.210 ±.005	5.895	139.07 ±0.94	5.33 ±0.13	5 1/2 × 5 7/8 × 3/16
-358	5.600 ±.037	.210 ±.005	6.020	142.24 ±0.94	5.33 ±0.13	5 5/8 × 6 × 3/16
-359	5.725 ±.037	.210 ±.005	6.145	145.42 ±0.94	5.33 ±0.13	5 3/4 × 6 1/8 × 3/16
-360	5.850 ±.037	.210 ±.005	6.270	148.59 ±0.94	5.33 ±0.13	5 7/8 × 6 1/4 × 3/16
-361	5.975 ±.037	.210 ±.005	6.395	151.77 ±0.94	5.33 ±0.13	6 × 6 3/8 × 3/16
-362	6.225 ±.040	.210 ±.005	6.645	158.12 ±1.02	5.33 ±0.13	6 1/4 × 6 5/8 × 3/16
-363	6.475 ±.040	.210 ±.005	6.895	164.47 ±1.02	5.33 ±0.13	6 1/2 × 6 7/8 × 3/16
-364	6.725 ±.040	.210 ±.005	7.145	170.82 ±1.02	5.33 ±0.13	6 3/4 × 7 1/8 × 3/16
-365	6.975 ±.040	.210 ±.005	7.395	177.17 ±1.02	5.33 ±0.13	7 × 7 3/8 × 3/16
-366	7.225 ±.045	.210 ±.005	7.645	183.52 ±1.14	5.33 ±0.13	7 1/4 × 7 5/8 × 3/16
-367	7.475 ±.045	.210 ±.005	7.895	189.87 ±1.14	5.33 ±0.13	7 1/2 × 7 7/8 × 3/16
-368	7.725 ±.045	.210 ±.005	8.145	196.22 ±1.14	5.33 ±0.13	7 3/4 × 8 1/8 × 3/16
-369	7.975 ±.045	.210 ±.005	8.395	202.57 ±1.14	5.33 ±0.13	8 × 8 3/8 × 3/16
-370	8.225 ±.050	.210 ±.005	8.645	208.92 ±1.27	5.33 ±0.13	8 1/4 × 8 5/8 × 3/16
-371	8.475 ±.050	.210 ±.005	8.895	215.27 ±1.27	5.33 ±0.13	8 1/2 × 8 7/8 × 3/16
-372	8.725 ±.050	.210 ±.005	9.145	221.62 ±1.27	5.33 ±0.13	8 3/4 × 9 1/8 × 3/16
-373	8.975 ±.050	.210 ±.005	9.395	227.97 ±1.27	5.33 ±0.13	9 × 9 3/8 × 3/16
-374	9.225 ±.055	.210 ±.005	9.645	234.32 ±1.40	5.33 ±0.13	9 1/4 × 9 5/8 × 3/16
-375	9.475 ±.055	.210 ±.005	9.895	240.67 ±1.40	5.33 ±0.13	9 1/2 × 9 7/8 × 3/16
-376	9.725 ±.055	.210 ±.005	10.145	247.02 ±1.40	5.33 ±0.13	9 3/4 × 10 1/8 × 3/16
-377	9.975 ±.055	.210 ±.005	10.395	253.37 ±1.40	5.33 ±0.13	10 × 10 3/8 × 3/16
-378	10.475 ±.060	.210 ±.005	10.895	266.07 ±1.52	5.33 ±0.13	10 1/2 × 10 7/8 × 3/16
-379	10.975 ±.060	.210 ±.005	11.395	278.77 ±1.52	5.33 ±0.13	11 × 11 3/8 × 3/16
-380	11.475 ±.065	.210 ±.005	11.895	291.47 ±1.65	5.33 ±0.13	11 1/2 × 11 7/8 × 3/16
-381	11.975 ±.065	.210 ±.005	12.395	304.17 ±1.65	5.33 ±0.13	12 × 12 3/8 × 3/16
-382	12.975 ±.065	.210 ±.005	13.395	329.57 ±1.65	5.33 ±0.13	13 × 13 3/8 × 3/16
-383	13.975 ±.070	.210 ±.005	14.395	354.97 ±1.78	5.33 ±0.13	14 × 14 3/8 × 3/16
-384	14.975 ±.070	.210 ±.005	15.395	380.37 ±1.78	5.33 ±0.13	15 × 15 3/8 × 3/16
-385	15.955 ±.075	.210 ±.005	16.375	405.26 ±1.91	5.33 ±0.13	16 × 16 3/8 × 3/16
-386	16.955 ±.080	.210 ±.005	17.375	430.66 ±2.03	5.33 ±0.13	17 × 17 3/8 × 3/16
-387	17.955 ±.085	.210 ±.005	18.375	456.06 ±2.16	5.33 ±0.13	18 × 18 3/8 × 3/16
-388	18.955 ±.090	.210 ±.005	19.375	481.46 ±2.29	5.33 ±0.13	19 × 19 3/8 × 3/16
-389	19.955 ±.095	.210 ±.005	20.375	506.86 ±2.41	5.33 ±0.13	20 × 20 3/8 × 3/16
-390	20.955 ±.095	.210 ±.005	21.375	532.26 ±2.41	5.33 ±0.13	21 × 21 3/8 × 3/16
-391	21.955 ±.100	.210 ±.005	22.375	557.66 ±2.54	5.33 ±0.13	22 × 22 3/8 × 3/16
-392	22.940 ±.105	.210 ±.005	23.360	582.68 ±2.67	5.33 ±0.13	23 × 23 3/8 × 3/16
-393	23.940 ±.110	.210 ±.005	24.360	608.08 ±2.79	5.33 ±0.13	24 × 24 3/8 × 3/16
-394	24.940 ±.115	.210 ±.005	25.360	633.48 ±2.92	5.33 ±0.13	25 × 25 3/8 × 3/16
-395	25.940 ±.120	.210 ±.005	26.360	658.88 ±3.05	5.33 ±0.13	26 × 26 3/8 × 3/16

-425 to -475: 0.275 in (6.99 mm) cross-section

AS568 dash no.	ID (in)	Cross-section (in)	OD ref. (in)	ID (mm)	Cross-section (mm)	Nominal ID × OD × width (in)
-425	4.475 ±.033	.275 ±.006	5.025	113.67 ±0.84	6.99 ±0.15	4 1/2 × 5 × 1/4
-426	4.600 ±.033	.275 ±.006	5.150	116.84 ±0.84	6.99 ±0.15	4 5/8 × 5 1/8 × 1/4
-427	4.725 ±.033	.275 ±.006	5.275	120.02 ±0.84	6.99 ±0.15	4 3/4 × 5 1/4 × 1/4
-428	4.850 ±.033	.275 ±.006	5.400	123.19 ±0.84	6.99 ±0.15	4 7/8 × 5 3/8 × 1/4
-429	4.975 ±.037	.275 ±.006	5.525	126.37 ±0.94	6.99 ±0.15	5 × 5 1/2 × 1/4
-430	5.100 ±.037	.275 ±.006	5.650	129.54 ±0.94	6.99 ±0.15	5 1/8 × 5 5/8 × 1/4
-431	5.225 ±.037	.275 ±.006	5.775	132.72 ±0.94	6.99 ±0.15	5 1/4 × 5 3/4 × 1/4
-432	5.350 ±.037	.275 ±.006	5.900	135.89 ±0.94	6.99 ±0.15	5 3/8 × 5 7/8 × 1/4
-433	5.475 ±.037	.275 ±.006	6.025	139.07 ±0.94	6.99 ±0.15	5 1/2 × 6 × 1/4
-434	5.600 ±.037	.275 ±.006	6.150	142.24 ±0.94	6.99 ±0.15	5 5/8 × 6 1/8 × 1/4
-435	5.725 ±.037	.275 ±.006	6.275	145.42 ±0.94	6.99 ±0.15	5 3/4 × 6 1/4 × 1/4
-436	5.850 ±.037	.275 ±.006	6.400	148.59 ±0.94	6.99 ±0.15	5 7/8 × 6 3/8 × 1/4
-437	5.975 ±.037	.275 ±.006	6.525	151.77 ±0.94	6.99 ±0.15	6 × 6 1/2 × 1/4
-438	6.225 ±.040	.275 ±.006	6.775	158.12 ±1.02	6.99 ±0.15	6 1/4 × 6 3/4 × 1/4
-439	6.475 ±.040	.275 ±.006	7.025	164.47 ±1.02	6.99 ±0.15	6 1/2 × 7 × 1/4
-440	6.725 ±.040	.275 ±.006	7.275	170.82 ±1.02	6.99 ±0.15	6 3/4 × 7 1/4 × 1/4
-441	6.975 ±.040	.275 ±.006	7.525	177.17 ±1.02	6.99 ±0.15	7 × 7 1/2 × 1/4
-442	7.225 ±.045	.275 ±.006	7.775	183.52 ±1.14	6.99 ±0.15	7 1/4 × 7 3/4 × 1/4
-443	7.475 ±.045	.275 ±.006	8.025	189.87 ±1.14	6.99 ±0.15	7 1/2 × 8 × 1/4
-444	7.725 ±.045	.275 ±.006	8.275	196.22 ±1.14	6.99 ±0.15	7 3/4 × 8 1/4 × 1/4
-445	7.975 ±.045	.275 ±.006	8.525	202.57 ±1.14	6.99 ±0.15	8 × 8 1/2 × 1/4
-446	8.475 ±.055	.275 ±.006	9.025	215.27 ±1.40	6.99 ±0.15	8 1/2 × 9 × 1/4
-447	8.975 ±.055	.275 ±.006	9.525	227.97 ±1.40	6.99 ±0.15	9 × 9 1/2 × 1/4
-448	9.475 ±.055	.275 ±.006	10.025	240.67 ±1.40	6.99 ±0.15	9 1/2 × 10 × 1/4
-449	9.975 ±.055	.275 ±.006	10.525	253.37 ±1.40	6.99 ±0.15	10 × 10 1/2 × 1/4
-450	10.475 ±.060	.275 ±.006	11.025	266.07 ±1.52	6.99 ±0.15	10 1/2 × 11 × 1/4
-451	10.975 ±.060	.275 ±.006	11.525	278.77 ±1.52	6.99 ±0.15	11 × 11 1/2 × 1/4
-452	11.475 ±.060	.275 ±.006	12.025	291.47 ±1.52	6.99 ±0.15	11 1/2 × 12 × 1/4
-453	11.975 ±.060	.275 ±.006	12.525	304.17 ±1.52	6.99 ±0.15	12 × 12 1/2 × 1/4
-454	12.475 ±.060	.275 ±.006	13.025	316.87 ±1.52	6.99 ±0.15	12 1/2 × 13 × 1/4
-455	12.975 ±.060	.275 ±.006	13.525	329.57 ±1.52	6.99 ±0.15	13 × 13 1/2 × 1/4
-456	13.475 ±.070	.275 ±.006	14.025	342.27 ±1.78	6.99 ±0.15	13 1/2 × 14 × 1/4
-457	13.975 ±.070	.275 ±.006	14.525	354.97 ±1.78	6.99 ±0.15	14 × 14 1/2 × 1/4
-458	14.475 ±.070	.275 ±.006	15.025	367.67 ±1.78	6.99 ±0.15	14 1/4 × 15 × 1/4
-459	14.975 ±.070	.275 ±.006	15.525	380.37 ±1.78	6.99 ±0.15	15 × 15 1/2 × 1/4
-460	15.475 ±.070	.275 ±.006	16.025	393.07 ±1.78	6.99 ±0.15	15 1/2 × 16 × 1/4
-461	15.955 ±.075	.275 ±.006	16.505	405.26 ±1.91	6.99 ±0.15	16 × 16 1/2 × 1/4
-462	16.455 ±.075	.275 ±.006	17.005	417.96 ±1.91	6.99 ±0.15	16 1/2 × 17 × 1/4
-463	16.955 ±.080	.275 ±.006	17.505	430.66 ±2.03	6.99 ±0.15	17 × 17 1/2 × 1/4
-464	17.455 ±.085	.275 ±.006	18.005	443.36 ±2.16	6.99 ±0.15	17 1/2 × 18 × 1/4
-465	17.955 ±.085	.275 ±.006	18.505	456.06 ±2.16	6.99 ±0.15	18 × 18 1/2 × 1/4
-466	18.455 ±.085	.275 ±.006	19.005	468.76 ±2.16	6.99 ±0.15	18 1/2 × 19 × 1/4
-467	18.955 ±.090	.275 ±.006	19.505	481.46 ±2.29	6.99 ±0.15	19 × 19 1/2 × 1/4
-468	19.455 ±.090	.275 ±.006	20.005	494.16 ±2.29	6.99 ±0.15	19 1/2 × 20 × 1/4
-469	19.955 ±.090	.275 ±.006	20.505	506.86 ±2.29	6.99 ±0.15	20 × 20 1/2 × 1/4
-470	20.955 ±.090	.275 ±.006	21.505	532.26 ±2.29	6.99 ±0.15	21 × 21 1/2 × 1/4
-471	21.955 ±.100	.275 ±.006	22.505	557.66 ±2.54	6.99 ±0.15	22 × 22 1/2 × 1/4
-472	22.940 ±.105	.275 ±.006	23.490	582.68 ±2.67	6.99 ±0.15	23 × 23 1/2 × 1/4
-473	23.940 ±.110	.275 ±.006	24.490	608.08 ±2.79	6.99 ±0.15	24 × 24 1/2 × 1/4
-474	24.940 ±.115	.275 ±.006	25.490	633.48 ±2.92	6.99 ±0.15	25 × 25 1/2 × 1/4
-475	25.940 ±.120	.275 ±.006	26.490	658.88 ±3.05	6.99 ±0.15	26 × 26 1/2 × 1/4

-901 to -932: boss seals for straight-thread tube fittings

AS568 dash no.	Tube OD (in)	ID (in)	Cross-section (in)	ID (mm)	Cross-section (mm)
-901	3/32	.185 ±.005	.056 ±.003	4.70	1.42
-902	1/8	.239 ±.005	.064 ±.003	6.07	1.63
-903	3/16	.301 ±.005	.064 ±.003	7.65	1.63
-904	1/4	.351 ±.005	.072 ±.003	8.92	1.83
-905	5/16	.414 ±.005	.072 ±.003	10.52	1.83
-906	3/8	.468 ±.005	.078 ±.003	11.89	1.98
-907	7/16	.530 ±.007	.082 ±.003	13.46	2.08
-908	1/2	.644 ±.009	.087 ±.003	16.36	2.21
-909	9/16	.706 ±.009	.097 ±.003	17.93	2.46
-910	5/8	.755 ±.009	.097 ±.003	19.18	2.46
-911	11/16	.863 ±.009	.116 ±.004	21.92	2.95
-912	3/4	.924 ±.009	.116 ±.004	23.47	2.95
-913	13/16	.986 ±.010	.116 ±.004	25.04	2.95
-914	7/8	1.047 ±.010	.116 ±.004	26.59	2.95
-916	1	1.171 ±.010	.116 ±.004	29.74	2.95
-918	1 1/8	1.355 ±.012	.116 ±.004	34.42	2.95
-920	1 1/4	1.475 ±.014	.118 ±.004	37.47	3.00
-924	1 1/2	1.720 ±.014	.118 ±.004	43.69	3.00
-928	1 3/4	2.090 ±.018	.118 ±.004	53.09	3.00
-932	2	2.337 ±.018	.118 ±.004	59.36	3.00

About the 900 series

Apple Rubber describes these as o-rings for boss gaskets on straight-thread tube fittings, "primarily utilized in hydraulic tubing and fittings up to 3000 psi", sealing under compression against the boss, and "normally supplied in 90 durometer material".
From -902 up, the last two digits are the tube outside diameter in sixteenths of an inch (-908 for a 1/2 in tube, -932 for a 2 in tube). -901 is the exception: the source lists it for a 3/32 in tube.
Their cross-sections (0.056 to 0.118 in) do not follow the five main AS568 series, so do not use the cross-section series rule above for them.

Choosing a size

Stretch on a piston (inside) groove: 1 to 5%, with 2% ideal in most applications; more than 5% is not recommended because the section thins and the ring ages faster. O-ring ID = groove diameter ÷ (1 + stretch): a 0.231 in groove takes an ID of 0.229 to 0.220 in (Apple Rubber, section 3).
Face (axial) seals are sized by the side the pressure pushes the ring towards: with pressure from the inside, give the ring some interference on its OD; with pressure from the outside, make its ID close to the groove ID (Apple Rubber, section 3).
Rotary shafts: do not stretch the ring over the shaft at all; use a shaft no larger than the ring's free ID (Apple Rubber, section 4).
Cross-section: pick it from the gland depth and the squeeze you need; the gland tables by cross-section are on O-Ring Groove Dimensions.

Sources

Apple Rubber Products, Inc., Seal Design Guide, 2020 (www.applerubber.com/src/pdf/seal-design-guide.pdf). Used for: AS568 sizes and tolerances (section 9), gland design tables (section 4, p. 20), stretch, squeeze, surface finish, extrusion and material temperature ranges.
SAE International, AS568 Aerospace Size Standard for O-rings (current revision; paywalled). Not reproduced here; the values above are Apple Rubber's published copy of the AS568 sizes. Apple Rubber's glossary notes that the standard "periodically changes so check for the latest revision".
Millimetre values are calculated on this page (inch × 25.4, rounded to 0.01 mm). They are not ISO 3601-1 metric sizes, which have their own dimensions and tolerances.

Frequently asked questions

What do AS568 dash numbers mean?

The dash number names one inside diameter and cross-section, and its first digit sets the cross-section: -004 to -050 are 0.070 in (1.78 mm), -102 to -178 are 0.103 in (2.62 mm), -201 to -284 are 0.139 in (3.53 mm), -309 to -395 are 0.210 in (5.33 mm) and -425 to -475 are 0.275 in (6.99 mm). Within a series the inside diameter grows with the number. -001, -002 and -003 are smaller sections (0.040, 0.050 and 0.060 in).

What size is an AS568-214 o-ring?

AS568-214 has an inside diameter of 0.984 ± 0.010 in and a cross-section of 0.139 ± 0.004 in, which is 24.99 mm × 3.53 mm. Its reference outside diameter is 1.262 in (32.05 mm). It is sold under the nominal size 1 × 1-1/4 × 1/8 in.

Why is the actual size different from the nominal size?

The nominal fractions are a name, not a measurement. AS568-214 is called 1 × 1-1/4 × 1/8 in, but its actual inside diameter is 0.984 in and its section is 0.139 in. Design the groove from the actual dimensions and tolerances. Apple Rubber notes that its listed sizes assume the shrinkage of 70 durometer nitrile, so other materials may need different tooling.

What are 900-series o-rings?

The -901 to -932 sizes are boss seals for straight-thread tube fittings, used mainly in hydraulic tubing and fittings up to 3,000 psi and normally made in 90 durometer material (Apple Rubber). From -902 up, the last two digits give the tube outside diameter in sixteenths of an inch: -904 suits a 1/4 in tube and has a 0.351 in ID × 0.072 in section; -916 suits a 1 in tube.

How do I pick the AS568 size for a piston groove?

Choose an o-ring whose inside diameter is slightly smaller than the groove diameter so that it is stretched 1 to 5%, with about 2% ideal (Apple Rubber). O-ring ID = groove diameter ÷ (1 + stretch). For a 0.231 in groove that gives 0.229 to 0.220 in. Then pick the cross-section that gives the right squeeze for the gland depth (see the o-ring groove dimensions page).

Was this article helpful?