ANSI B16.5 Class 900 Lap Joint Flanges

Nominal Pipe Size	Outside Diameter (O)	Thickness (T)	Length Thru Hub (Y)	Hub Diameter (X)	Radius (r)	Bore (B)	Approximate Weight	Bolt Circle (C)	Number of Holes	Diameter of Holes
1/2	4.75 mm	0.88 mm	1.38 mm	1.50 mm	0.13 mm	0.90 mm	4 lb	3.25 mm	4	0.88 mm
3/4	5.13 mm	1.00 mm	1.69 mm	1.75 mm	0.13 mm	1.11 mm	5 lb	3.50 mm	4	0.88 mm
1	5.88 mm	1.13 mm	2.00 mm	2.06 mm	0.13 mm	1.38 mm	8 lb	4.00 mm	4	1.00 mm
1 1/4	6.25 mm	1.13 mm	2.50 mm	2.50 mm	0.19 mm	1.72 mm	9 lb	4.38 mm	4	1.00 mm
1 1/2	7.00 mm	1.25 mm	2.88 mm	2.75 mm	0.25 mm	1.97 mm	12 lb	4.88 mm	4	1.13 mm
2	8.50 mm	1.50 mm	3.63 mm	4.13 mm	0.31 mm	2.46 mm	25 lb	6.50 mm	8	1.00 mm
2 1/2	9.63 mm	1.63 mm	4.13 mm	4.88 mm	0.31 mm	2.97 mm	35 lb	7.50 mm	8	1.13 mm
3	9.50 mm	1.50 mm	2.13 mm	5.25 mm	0.38 mm	3.60 mm	25 lb	7.50 mm	8	1.00 mm
4	11.50 mm	1.75 mm	2.75 mm	6.25 mm	0.44 mm	4.60 mm	51 lb	9.25 mm	8	1.25 mm
5	13.75 mm	2.00 mm	3.13 mm	7.50 mm	0.50 mm	5.69 mm	81 lb	11.00 mm	8	1.38 mm
6	15.00 mm	2.19 mm	3.38 mm	9.25 mm	0.50 mm	6.75 mm	105 lb	12.50 mm	12	1.25 mm
8	18.50 mm	2.50 mm	4.50 mm	11.75 mm	0.50 mm	8.75 mm	190 lb	15.50 mm	12	1.50 mm
10	21.50 mm	2.75 mm	5.00 mm	14.50 mm	0.50 mm	10.92 mm	275 lb	18.50 mm	16	1.50 mm
12	24.00 mm	3.13 mm	5.63 mm	16.50 mm	0.50 mm	12.92 mm	370 lb	21.00 mm	20	1.50 mm
14	25.25 mm	3.38 mm	6.13 mm	17.75 mm	0.50 mm	14.18 mm	415 lb	22.00 mm	20	1.63 mm
16	27.75 mm	3.50 mm	6.50 mm	20.00 mm	0.50 mm	16.19 mm	465 lb	24.25 mm	20	1.75 mm
18	31.00 mm	4.00 mm	7.50 mm	22.25 mm	0.50 mm	18.20 mm	650 lb	27.00 mm	20	2.00 mm
20	33.75 mm	4.25 mm	8.25 mm	24.50 mm	0.50 mm	20.25 mm	810 lb	29.50 mm	20	2.13 mm
24	41.00 mm	5.50 mm	10.50 mm	29.50 mm	0.50 mm	24.25 mm	1550 lb	35.50 mm	20	2.63 mm

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