What is ANSI dimensioning standard?

ANSI B36.19 is for seamless pipe and welded pipe sizes.

Stainless ANSI dimensioning standard is ANSI DIMENSION B36.19.

ANSI B36.19 dimensions are read horizontally. ISO dimensions are parallel to the dimension line. ANSI B36.19 dimensions are centered on the dimension line. ISO dimension B36.19 are placed above the dimension line. ANSI tends to use abbreviations.

Stainless PIPE ANSI DIMENSION B36.19
Nominal Size		OD	Wall Thickness
NPS	DN	mm	SCH5S	SCH10S	SCH10	SCH20	SCH30	SCH40S	STD	SCH40	SCH60	SCH80S	XS	SCH80	SCH100	SCH120	SCH140	SCH160	XXS
1∕8	6	10.3	–	1.24	–	–	–	1.73	1.73	1.73	–	2.41	2.41	2.41	–	–	–	–	–
1∕4	8	13.7	–	1.65	–	–	–	2.24	2.24	2.24	–	3.02	3.02	3.02	–	–	–	–	–
3∕8	10	17.2	–	1.65	–	–	–	2.31	2.31	2.31	–	3.2	3.2	3.2	–	–	–	–	–
1∕2	15	21.3	1.65	2.11	–	–	–	2.77	2.77	2.77	–	3.73	3.73	3.73	–	–	–	4.78	7.47
3∕4	20	26.7	1.65	2.11	–	–	–	2.87	2.87	2.87	–	3.91	3.91	3.91	–	–	–	5.56	7.82
1	25	33.4	1.65	2.77	–	–	–	3.38	3.38	3.38	–	4.55	4.55	4.55	–	–	–	6.35	9.09
1 1∕4	32	42.2	1.65	2.77	–	–	–	3.56	3.56	3.56	–	4.85	4.85	4.85	–	–	–	6.35	9.7
1 1∕2	40	48.3	1.65	2.77	–	–	–	3.68	3.68	3.68	–	5.08	5.08	5.08	–	–	–	7.14	10.15
2	50	60.3	1.65	2.77	–	–	–	3.91	3.91	3.91	–	5.54	5.54	5.54	–	–	–	8.74	11.07
2 1∕2	65	73	2.11	3.05	–	–	–	5.16	5.16	5.16	–	7.01	7.01	7.01	–	–	–	9.53	14.02
3	80	88.9	2.11	3.05	–	–	–	5.49	5.49	5.49	–	7.62	7.62	7.62	–	–	–	11.13	15.24
3 1∕2	90	101.6	2.11	3.05	–	–	–	5.74	5.74	5.74	–	8.08	8.08	8.08	–	–	–	–	–
4	100	114.3	2.11	3.05	–	–	–	6.02	6.02	6.02	–	8.56	8.56	8.56	–	11.13	–	13.49	17.12
5	125	141.3	2.77	3.4	–	–	–	6.55	6.55	6.55	–	9.53	9.53	9.53	–	12.7	–	15.88	19.05
6	150	168.3	2.77	3.4	–	–	–	7.11	7.11	7.11	–	10.97	10.97	10.97	–	14.27	–	18.26	21.95
8	200	219.1	2.77	3.76	–	6.35	7.04	8.18	8.18	8.18	10.31	12.7	12.7	12.7	15.09	18.26	20.62	23.01	22.23
10	250	273.1	3.4	4.19	–	6.35	7.8	9.27	9.27	9.27	12.7	12.7	12.7	15.09	18.26	21.44	25.4	28.58	25.4
12	300	323.9	3.96	4.57	–	6.35	8.38	9.53	9.53	10.31	14.27	12.7	12.7	17.48	21.44	25.4	28.58	33.32	25.4
14	350	355.6	3.96	4.78	6.35	7.92	9.53	–	9.53	11.13	15.09	–	12.7	19.05	23.83	27.79	31.75	35.71	–
16	400	406.4	4.19	4.78	6.35	7.92	9.53	–	9.53	12.7	16.66	–	12.7	21.44	26.19	30.96	36.53	40.49	–
18	450	457.2	4.19	4.78	6.35	7.92	11.13	–	9.53	14.27	19.05	–	12.7	23.83	29.36	34.93	39.67	45.24	–
20	500	508	4.78	5.54	6.35	9.53	12.7	–	9.53	15.09	20.62	–	12.7	26.19	32.54	38.1	44.45	50.01	–
22	550	558.8	4.78	5.54	6.35	9.53	12.7	–	9.53	–	22.23	–	12.7	28.58	34.93	41.28	47.63	53.98	–
24	600	609.6	5.54	6.35	6.35	9.53	14.27	–	9.53	17.48	24.61	–	12.7	30.96	38.89	46.02	52.37	59.54	–
26	650	660.4	–	–	7.92	12.7	–	–	9.53	–	–	–	12.7	–	–	–	–	–	–
28	700	711.2	–	–	7.92	12.7	15.88	–	9.53	–	–	–	12.7	–	–	–	–	–	–
30	750	762	6.35	7.92	7.92	12.7	15.88	–	9.53	–	–	–	12.7	–	–	–	–	–	–
32	800	812.8	–	–	7.92	12.7	15.88	17.48	9.53	17.48	–	–	12.7	–	–	–	–	–	–
34	850	863.6	–	–	7.92	12.7	15.88	17.48	9.53	17.48	–	–	12.7	–	–	–	–	–	–
36	900	914.4	–	–	7.92	12.7	15.88	19.05	9.53	19.05	–	–	12.7	–	–	–	–	–	–
38	950	965.2	–	–	–	–	–	–	9.53	–	–	–	12.7	–	–	–	–	–	–
40	1000	1016	–	–	–	–	–	–	9.53	–	–	–