Class 350 Industry Standard Add Flanges

* Bore (B): To be specified by purchaser

Nominal Size	Outside Diameter (OD)	Thickness - Weld Neck (T)	Thickness - Slip-on (T)	Thickness - Blind (T)	Raised Face Dia. (R)	Hub Diameter (X)	* Bore (B)	Bore (B₂)	Length Through Hub - Weld Neck (Y)	Length Through Hub - Slip-on (L)	Drilling - Bolt Circle (BC)	Drilling - Dia. of Holes	Drilling - No. of Holes	Approx. Weight - Weld Neck (lbs)	Approx. Weight - Slip-on (lbs)	Approx. Weight - Blind (lbs)
26	32.75	2.50	2.50	2.75	29.50	27.88	*	26.25	5.00	4.50	30.63	1.13	28	245	225	580
28	34.75	2.50	2.50	2.88	31.50	29.88	*	28.25	5.00	4.50	32.63	1.13	28	260	250	750
30	37.00	2.63	2.63	3.00	33.75	32.13	*	30.25	5.25	4.75	34.88	1.13	32	305	295	890
32	39.00	2.75	2.75	3.25	35.75	34.13	*	32.35	5.50	5.00	36.88	1.13	36	340	325	1050
34	41.00	2.88	2.88	3.38	37.75	36.13	*	34.25	5.75	5.13	38.88	1.13	40	375	355	1225
36	43.75	3.13	3.13	3.63	40.25	38.50	*	36.25	6.13	5.63	41.50	1.25	40	480	465	1500
38	45.75	3.13	3.13	3.75	42.25	40.50	*	38.25	6.13	5.63	43.50	1.25	40	510	490	1700
40	47.75	3.25	3.25	4.00	44.25	42.50	*	40.25	6.25	5.88	45.50	1.25	44	540	530	1975
42	50.00	3.50	3.50	4.13	46.50	44.75	*	42.25	6.50	6.13	47.75	1.25	48	640	620	2225
44	52.75	3.75	3.75	4.38	48.88	46.75	*	44.25	6.75	6.75	50.25	1.38	44	760	760	2625
46	54.75	4.25	4.25	4.75	50.88	48.75	*	46.25	7.25	7.25	52.25	1.38	48	880	880	2950
48	56.75	4.25	4.25	4.75	52.88	50.75	*	48.25	7.25	7.25	54.25	1.38	48	920	920	3300
52	61.50	4.25	-	-	57.25	55.00	*	52.25	7.50	-	58.75	1.50	52	1075	-	-
54	63.50	4.50	4.75	-	59.25	57.00	*	54.25	7.75	8.25	60.75	1.50	52	1200	1150	-
60	69.50	4.50	5.00	-	65.25	63.00	*	60.25	8.00	8.50	66.75	1.50	60	1325	1450	-
66	77.00	4.00	-	-	72.38	70.00	*	66.25	8.50	-	74.00	1.63	60	1675	-	-
72	83.00	4.00	-	-	78.38	76.00	*	72.25	9.00	-	80.00	1.63	72	1850	-	-

Dimensions are in inches