U.S. Size	British	French	German	Japan	Swiss	Dia inch	Dia MM	Metric
0000	-	-	-	-	-	.390	9.91	-
00	-	-	-	-	-	.422	10.73	-
0	-	-	-	-	-	.454	10.73	-
1/2	A	-	-	-	-	.474	12.18	-
3/4	A 1/2	-	-	-	-	.482	10.73	-
1	B	-	-	1	-	.487	12.37	38.9
1 1/4	B 1/2	-	-	-	-	-	10.73	39.6
1 1/2	C	-	-	-	-	.503	12.76	40.2
1 3/4	C 1/2	-	-	-	-	-	13.00	40.8
2	d	41 1/2	12 1/2	2	1 1/2	.520	13.21	41.5
2 1/4	D 1/2	-	-	-	-	-	13.41	42.1
2 1/2	E	42 3/4	13 3/4	3	2 3/4	.536	13.61	42.7
2 3/4	E 1/2	-	-	-	-	-	13.83	43.4
3	F	44	14	4	4	.533	14.05	44.0
3 1/8	F 1/2	-	-	-	-	-	14.15	44.3
3 1/4	-	-	-	-	-	-	14.25	44.6
3 3/8	G	45 1/4	-	5	5 1/4	-	14.36	44.9
3 1/2	-	-	14.5	-	-	.569	14.45	45.2
3 5/8	G 1/2	-	-	6	-	-	14.56	45.6
3 3/4	H	46 1/2	-	-	6 1/2	-	14.65	45.9

U.S. Size	British	French	German	Japan	Swiss	Dia inch	Dia MM	Metric
4	H 1/2	-	15	7	-	.585	14.85	46.5
4 1/4	I	47 3/4	-	-	7 3/4	-	15.04	47.1
4 1/2	I 1/2	-	15 1/4	8	-	.601	15.27	47.8
4 5/8	J	492	15 1/2	-	9	-	15.40	48.1
4 3/4	-	-	-	-	-	-	15.53	48.4
5	J 1/2	-	15 3/4	9	-	.618	15.70	49.0
5 1/8	K	50	-	-	10	-	15.80	49.3
5 1/4	-	-	-	-	-	-	15.90	49.6
5 3/8	K 1/2	-	-	10	-	.	16.00	50.0
5 1/2	L	51 3/4	16	-	11 3/4	.634	16.10	50.3
5 3/4	-	-	-	-	-	-	16.30	50.9
5 7/8	L 1/2	-	-	-	-	-	16.41	51.3
6	M	52 3/4	16 1/2	12	12 3/4	.650	16.51	51.5
6 1/4	M 1/2	-	-	-	-	-	16.71	52.2
6 1/2	N	54	17	13	14	.666	16.92	52.8
6 3/4	N 1/2	-	-	-	-	-	17.13	53.4
7	O	55 1/4	17 1/4	14	15 14	.683	17.35	54
7 1/4	O 1/2	-	-	-	-	-	17.45	54.7
7 1/2	P	56 1/2	17 3/4	15	16 1/2	.699	17.75	55.3
7 3/4	P 1/2	-	-	-	-	-	17.97	55.9
8	Q	57 3/4	18	16	17.34	.716	18.19	56.6
8 1/4	Q 1/2	-	-	-	-	-	18.35	57.2
8 1/2	-	-	18.5	17	-	.732	18.53	57.8

U.S. Size	British	French	German	Japan	Swiss	Dia inch	Dia MM	Metric
8 5/8	R	59	-	-	19	-	18.61	58.4
8 3/4	-	-	-	-	-	-	18.69	58.4
8 7/8	R 1/2 1/2	-	-	-	-	-	18.80	59.0
9	-	-	19	18	-	-	18.89	59.1
9 1/8	S	60 1/4	-	-	20 1/4	-	19.10	59.4
9 1/4	-	-	-	-	-	-	19.22	59.7
9 3/8	S 1/2	-	-	-	-	-	19.31	60.0
9 1/2	-	-	19 1/2	19	-	.764	19.41	60.3
9 5/8	T	61 1/2	-	-	21 1/2	-	19.51	60.6
9 3/4	-	-	-	-	-	-	19.62	60.9
10	T 1/2	-	20	20	-	.781	19.84	61.6
10 1/4	U	62 3/4	-	21	22 3/4	-	20.02	62.2
10 1/2	U 1/2	-	20 1/4	22	-	.797	20.20	62.8
10 5/8	V	63	-	-	23 3/4	-	20.32	63.1
10 3/4	-	-	-	-	-	-	20.44	63.5
11	V 1/2	-	20 3/4	23	-	.814	20.68	64.1
11 1/8	W	65	-	-	25	-	20.76	64.3
11 1/4	-	-	-	-	-	-	20.85	64.7
11 3/8	W 1/2	-	-	-	-	-	20.944	65.0
11 1/2	-	-	21	24	-	-	21.08	65.3
11 5/8	X	66 1/4	-	-	26 1/4	.830	21.18	65.7
11 3/4	-	-	-	-	-	-	21.24	66.0
11 7/8	X 1/2	-	-	-	-	-	21.30	66.3
12	Y	67 1/2	21 1/4	25	27 1/2	.846	21.49	66.6

U.S. Size	British	French	German	Japan	Swiss	Dia inch	Dia MM	Metric
12 1/4	Y 1/2	-	-	-	-	-	21.69	67.2
12 1/2	Z	68 3/4	21 3/4	26	28 3/4	.862	21.89	67.9
12 3/4	Z 1/2	-	-	-	-	-	22.10	68.5
13	-	-	22	27	-	.879	22.33	69.1

0riginal Design by Kiwialan email Kiwi Alan Created 25 August 2005. Updated 26 July 2006. Copyright© 1998-2009 All rights reserved!

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