ANSI B16.5 Class 400 Threaded Flanges

Nominal Pipe Size	Outside Diameter (O)	Thickness (T)	Raised Face Diameter (R)	Length Thru Hub (Y)	Hub Diameter (X)	Approximate Weight	Bolt Circle (C)	Number of Holes	Diameter of Holes
1/2	3.75 mm	0.56 mm	1.38 mm	0.88 mm	1.50 mm	2 lb	2.63 mm	4	0.63 mm
3/4	4.63 mm	0.63 mm	1.69 mm	1.00 mm	1.88 mm	3 lb	3.25 mm	4	0.75 mm
1	4.88 mm	0.69 mm	2.00 mm	1.06 mm	2.13 mm	4 lb	3.50 mm	4	0.75 mm
1 1/4	5.25 mm	0.81 mm	2.50 mm	1.13 mm	2.50 mm	5 lb	3.88 mm	4	0.75 mm
1 1/2	6.13 mm	0.88 mm	2.88 mm	1.25 mm	2.75 mm	7 lb	4.50 mm	4	0.88 mm
2	6.50 mm	1.00 mm	3.63 mm	1.44 mm	3.31 mm	9 lb	5.00 mm	8	0.75 mm
2 1/2	7.50 mm	1.13 mm	4.13 mm	1.63 mm	3.94 mm	13 lb	5.88 mm	8	0.88 mm
3	8.25 mm	1.25 mm	5.00 mm	1.81 mm	4.63 mm	16 lb	6.63 mm	8	0.88 mm
3 1/2	9.00 mm	1.38 mm	5.50 mm	1.94 mm	5.25 mm	21 lb	7.25 mm	8	1.00 mm
4	10.00 mm	1.38 mm	6.19 mm	2.00 mm	5.75 mm	26 lb	7.88 mm	8	1.00 mm
5	11.00 mm	1.50 mm	7.31 mm	2.13 mm	7.00 mm	31 lb	9.25 mm	8	1.00 mm
6	12.50 mm	1.63 mm	8.50 mm	2.25 mm	8.13 mm	44 lb	10.63 mm	12	1.00 mm
8	15.00 mm	1.88 mm	10.63 mm	2.69 mm	10.25 mm	67 lb	13.00 mm	12	1.13 mm
10	17.50 mm	2.13 mm	12.75 mm	2.88 mm	12.63 mm	91 lb	15.25 mm	16	1.25 mm
12	20.50 mm	2.25 mm	15.00 mm	3.13 mm	14.75 mm	130 lb	17.75 mm	16	1.38 mm
14	23.00 mm	2.38 mm	16.25 mm	3.31 mm	16.75 mm	180 lb	20.25 mm	20	1.38 mm
16	25.50 mm	2.50 mm	18.50 mm	3.69 mm	19.00 mm	235 lb	22.50 mm	20	1.50 mm
18	28.00 mm	2.63 mm	21.00 mm	3.88 mm	21.00 mm	285 lb	24.75 mm	24	1.50 mm
20	30.50 mm	2.75 mm	23.00 mm	4.00 mm	23.13 mm	345 lb	27.00 mm	24	1.63 mm
22	33.00 mm	2.88 mm	25.25 mm	4.25 mm	25.25 mm	405 lb	29.25 mm	24	1.75 mm
24	36.00 mm	3.00 mm	27.25 mm	4.50 mm	27.63 mm	510 lb	32.00 mm	24	1.88 mm

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