Industry Standard Class 175 Welding Neck Flanges

Nominal Pipe Size	Outside Diameter (O)	Thickness (T)	Raised Face Diameter (R)	Length Thru Hub (Y)	Diameter of Hub at Bevel (A)	Base of Hub Diameter (X)	Bore (B)	Approximate Weight	Bolt Circle (C)	Number of Holes	Diameter of Bolt Holes
26	31.50 mm	1.38 mm	29.00 mm	3.38 mm	Specified by purchaser	27.63 mm	Specified by purchaser	120 lb	29.88 mm	28	0.88 mm
28	33.50 mm	1.38 mm	31.00 mm	3.38 mm	Specified by purchaser	29.63 mm	Specified by purchaser	130 lb	31.88 mm	28	0.88 mm
30	35.75 mm	1.38 mm	33.25 mm	3.63 mm	Specified by purchaser	31.88 mm	Specified by purchaser	150 lb	34.13 mm	36	0.88 mm
32	37.75 mm	1.38 mm	35.25 mm	3.63 mm	Specified by purchaser	33.88 mm	Specified by purchaser	160 lb	36.13 mm	36	0.88 mm
34	40.25 mm	1.50 mm	37.38 mm	3.75 mm	Specified by purchaser	35.88 mm	Specified by purchaser	195 lb	38.38 mm	36	1.00 mm
36	42.25 mm	1.50 mm	39.38 mm	3.75 mm	Specified by purchaser	37.88 mm	Specified by purchaser	205 lb	40.38 mm	36	1.00 mm
38	44.25 mm	1.75 mm	41.38 mm	4.13 mm	Specified by purchaser	39.88 mm	Specified by purchaser	245 lb	42.38 mm	36	1.00 mm
40	46.25 mm	1.75 mm	43.38 mm	4.13 mm	Specified by purchaser	41.88 mm	Specified by purchaser	255 lb	44.38 mm	40	1.00 mm
42	49.00 mm	2.00 mm	45.75 mm	4.50 mm	Specified by purchaser	44.13 mm	Specified by purchaser	340 lb	46.88 mm	40	1.13 mm
44	51.00 mm	2.00 mm	47.75 mm	4.50 mm	Specified by purchaser	46.13 mm	Specified by purchaser	360 lb	48.88 mm	40	1.13 mm
46	53.00 mm	2.00 mm	49.75 mm	4.50 mm	Specified by purchaser	48.13 mm	Specified by purchaser	375 lb	50.88 mm	40	1.13 mm
48	55.00 mm	2.25 mm	51.75 mm	4.88 mm	Specified by purchaser	50.13 mm	Specified by purchaser	430 lb	52.88 mm	44	1.13 mm
50	57.00 mm	2.25 mm	53.75 mm	4.88 mm	Specified by purchaser	52.13 mm	Specified by purchaser	450 lb	54.88 mm	44	1.13 mm
52	59.50 mm	2.63 mm	56.00 mm	5.38 mm	Specified by purchaser	54.25 mm	Specified by purchaser	560 lb	57.25 mm	44	1.25 mm
54	61.50 mm	2.63 mm	58.00 mm	5.38 mm	Specified by purchaser	56.25 mm	Specified by purchaser	580 lb	59.25 mm	44	1.25 mm
60	67.50 mm	2.75 mm	64.00 mm	5.75 mm	Specified by purchaser	62.25 mm	Specified by purchaser	680 lb	65.25 mm	48	1.25 mm
66	73.50 mm	3.13 mm	70.00 mm	6.13 mm	Specified by purchaser	68.50 mm	Specified by purchaser	830 lb	71.25 mm	56	1.25 mm
72	80.00 mm	3.63 mm	76.50 mm	6.63 mm	Specified by purchaser	74.50 mm	Specified by purchaser	1075 lb	77.75 mm	64	1.25 mm
84	94.00 mm	3.00 mm	90.13 mm	7.00 mm	Specified by purchaser	88.00 mm	Specified by purchaser	1550 lb	91.50 mm	72	1.38 mm
96	106.00 mm	3.50 mm	102.13 mm	7.50 mm	Specified by purchaser	100.00 mm	Specified by purchaser	1950 lb	103.50 mm	88	1.38 mm

Industry Standard Class 175 Welding Neck Flanges

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