ANSI B16.5 Class 2500 Welding Neck Flanges

Nominal Pipe Size	Outside Diameter (O)	Thickness (T)	Raised Face Diameter	Length Thru Hub (Y)	Point of Weld (A)	Hub Diameter (X)	Bore (B)	Approximate Weight	Bolt Circle (C)	Number of Holes	Diameter of Holes
1/2	5.25 mm	1.19 mm	1.38 mm	2.88 mm	0.84 mm	1.69 mm	Specified by purchaser	7 lb	3.50 mm	4	0.88 mm
3/4	5.50 mm	1.25 mm	1.69 mm	3.13 mm	1.05 mm	2.00 mm	Specified by purchaser	8 lb	3.75 mm	4	0.88 mm
1	6.25 mm	1.38 mm	2.00 mm	3.50 mm	1.32 mm	2.25 mm	Specified by purchaser	12 lb	4.25 mm	4	1.00 mm
1 1/4	7.25 mm	1.50 mm	2.50 mm	3.75 mm	1.66 mm	2.88 mm	Specified by purchaser	17 lb	5.13 mm	4	1.13 mm
1 1/2	8.00 mm	1.75 mm	2.88 mm	4.38 mm	1.90 mm	3.13 mm	Specified by purchaser	25 lb	5.75 mm	4	1.25 mm
2	9.25 mm	2.00 mm	3.63 mm	5.00 mm	2.38 mm	3.75 mm	Specified by purchaser	42 lb	6.75 mm	8	1.13 mm
2 1/2	10.50 mm	2.25 mm	4.13 mm	5.63 mm	2.88 mm	4.50 mm	Specified by purchaser	52 lb	7.75 mm	8	1.25 mm
3	12.00 mm	2.63 mm	5.00 mm	6.63 mm	3.50 mm	5.25 mm	Specified by purchaser	94 lb	9.00 mm	8	1.38 mm
4	14.00 mm	3.00 mm	6.19 mm	7.50 mm	4.50 mm	6.50 mm	Specified by purchaser	145 lb	10.75 mm	8	1.63 mm
5	16.50 mm	3.63 mm	7.31 mm	9.00 mm	5.56 mm	8.00 mm	Specified by purchaser	245 lb	12.75 mm	8	1.88 mm
6	19.00 mm	4.25 mm	8.50 mm	10.75 mm	6.63 mm	9.25 mm	Specified by purchaser	380 lb	14.50 mm	8	2.13 mm
8	21.75 mm	5.00 mm	10.63 mm	12.50 mm	8.63 mm	12.00 mm	Specified by purchaser	580 lb	17.25 mm	12	2.13 mm
10	26.50 mm	6.50 mm	12.75 mm	16.50 mm	10.75 mm	14.75 mm	Specified by purchaser	1075 lb	21.25 mm	12	2.63 mm
12	30.00 mm	7.25 mm	15.00 mm	18.25 mm	12.75 mm	17.38 mm	Specified by purchaser	1525 lb	24.38 mm	12	2.88 mm

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