ASME B16.48 Class 2500

A figure-8 blank (also called a Spectacle Blind Flange) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar.

NPS	Inside Diameter, B	Outside Diameter, O	Centerline Dimension, A	Thick-ness, t	Web Width, W		Approximate Weight kgs
1/2	16	67	90	9.7	38	7	1.40
3/4	21	73	95	9.7	41	7	1.62
1	27	83	110	9.7	64	7	2.20
1 1/4	35	102	130	12.7	64	7	3.54
1 1/2	41	114	145	15.7	70	7	4.87
2	53	143	170	15.7	70	7	7.29
2 1/2	63	165	195	19.1	76	7	10.73
3	78	194	230	22.4	76	7	16.15
4	102	232	275	28.4	89	7	26.46
5	128	276	325	35.1	89	7	42.51
6	154	314	370	41.1	89	7	60.70
8	198	384	440	53.8	102	7	108.94
10	248	473	540	66.5	114	7	194.86
12	289	546	620	79.2	114	7	298.68