Nominal size		L	Ｔ	H	H1
Ａ	Ｂ
8	1/4	19	6	17	14
10	3/8	22	8	19	17
15	1/2	25	8	23	22
20	3/4	28	9	29	27
25	1	30	9	35	35
32	1 1/4	34	12	46	46
40	1 1/2	37	14	50	50
50	2	41	16	63	63