ANSI B16.5 Class 300 Welding Neck Flanges - Pipe Flanges Manufacturers in China

(A)All dimensions are in inches.

(B)These flanges will be furnished with a 1/16″ raised face unless otherwise specified.For more alternate flange facings, please click here!

(C)Standard Bore will be furnished unless otherwise specified.For more diameter of holes, please click here!

Nominal Pipe Size	Outside Diameter (O)	Bolt Circle (W)	Raised Face Diameter (R)	Number of Holes	Diameter of Holes	Bore (B)	Point of Weld (A)	Hub Diameter (X)	Thickness (T)	Length Thru Hub (Y)	Approximate Weight (lbs)
1/2	3.75	2.62	1.38	4	0.63	0.62	0.84	1.50	0.50	2.00	2
3/4	4.62	3.25	1.69	4	0.75	0.82	1.05	1.88	0.56	2.19	3
1	4.88	3.50	2.00	4	0.75	1.05	1.32	2.12	0.62	2.38	4
1 1/4	5.25	3.88	2.50	4	0.75	1.38	1.66	2.50	0.69	2.50	5
1 1/2	6.12	4.50	2.88	4	0.88	1.61	1.90	2.75	0.75	2.63	7
2	6.50	5.00	3.62	8	0.75	2.07	2.38	3.31	0.81	2.69	9
2 1/2	7.50	5.88	4.12	8	0.88	2.47	2.88	3.94	0.94	2.94	12
3	8.25	6.62	5.00	8	0.88	3.07	3.50	4.62	1.06	3.06	15
3 1/2	9.00	7.25	5.50	8	0.88	3.55	4.00	5.25	1.12	3.13	18
4	10.00	7.88	6.19	8	0.88	4.03	4.50	5.75	1.19	3.32	25
5	11.00	9.25	7.31	8	0.88	5.05	5.56	7.00	1.31	3.82	32
6	12.50	10.62	8.50	12	0.88	6.07	6.63	8.12	1.38	3.82	42
8	15.00	13.00	10.62	12	1.00	7.98	8.63	10.25	1.56	4.32	67
10	17.50	15.25	12.75	16	1.12	10.02	10.75	12.62	1.81	4.56	91
12	20.50	17.75	15.00	16	1.25	12.00	12.75	14.75	1.94	5.06	140
14	23.00	20.25	16.25	20	1.25	13.25	14.00	16.75	2.06	5.56	180
16	25.50	22.50	18.50	20	1.38	15.25	16.00	19.00	2.19	5.65	250
18	28.00	24.75	21.00	24	1.38	17.25	18.00	21.00	2.31	6.19	320
20	30.50	27.00	23.00	24	1.38	19.25	20.00	23.12	2.44	6.32	400
22	33.00	29.25	25.25	24	1.63	21.25	22.00	25.25	2.56	6.44	465
24	36.00	32.00	27.25	24	1.63	23.25	24.00	27.62	2.69	6.56	580

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