Class 175 Flanges

INDUSTRY STANDARD CLASS 175

		Thickness					Bore		LTH
Nom Size	OD	Weld Neck	Slip-On	Blind	OD of RF	Dia at Base	Weld Neck	Slip-On	Weld Neck	Slip-On	Dia Bevel
	O	T	T		R	X	B	B	L	L	A
26	31.5	1.38	1.38	1.78	29	27.63		26.25	3.38	2.75
28	33.5	1.38	1.38	2	31	29.63		28.25	3.38	2.75
30	35.75	1.38	1.38	2.13	33.25	31.88		30.25	3.63	2.75
32	37.75	1.38	1.38	2.25	35.25	33.88		32.25	3.63	2.75
34	40.25	1.5	1.75	2.38	37.38	35.88		34.25	3.75	3.38
36	42.25	1.5	1.75	2.5	39.38	37.88		36.25	3.75	3.38
38	44.25	1.75	2	2.63	41.38	39.88		38.25	4.13	3.75
40	46.25	1.75	2	2.75	43.38	41.88		40.25	4.13	4
42	49	2	2.38	2.88	45.75	44.13		42.25	4.5	4.38
44	51	2	2.38	3	47.75	46.13		44.25	4.5	4.38
46	53	2	2.38	3.13	49.75	48.13		46.25	4.5	4.63
48	55	2.25	2.63	3.38	51.75	50.13		48.25	4.88	4.88
50	57	2.25	2.63	3.38	53.75	52.13		50.25	4.88	4.88
52	59.5	2.63	3	3.63	56	54.25		52.25	5.38	5.38
54	61.5	2.63	3	3.63	58	56.25		54.25	5.38	5.38
60	67.5	2.75	3.13	4	64	62.25		60.25	5.75	5.88
66	73.5	3.13	4	4.38	70	68.5		66.25	6.13	6.88
72	80	3.63	5	4.75	76.5	74.5		72.25	6.63	8
84	94	3	5	5.5	90.13	88		84.25	7	8.5
96	106	3.5	5	6.12	102.13	100		96.25	7.5	9

Dimensions are in inches. Weights are in pounds.

	Drilling				Weight
Nom Size	Bolt Circle	Bolt Lengtha	Hole Diab	# of Holes	Weld Neck	Slip On	Blind
26	29.88	5.5	0.88	28	120	105	405
28	31.88	5.75	0.88	28	130	115	490
30	34.13	5.75	0.88	36	150	130	590
32	36.13	6	0.88	36	160	140	700
34	38.38	6.75	1	36	195	200	840
36	40.38	6.75	1	36	205	210	970
38	42.38	7.25	1	36	245	250	1125
40	44.38	7.25	1	40	255	270	1300
42	46.88	8	1.13	40	340	365	1500
44	48.88	8.25	1.13	40	360	380	1700
46	50.88	8.25	1.13	40	375	410	1925
48	52.88	8.75	1.13	44	430	460	2225
50	54.88	8.75	1.13	44	450	480	2400
52	57.25	9.75	1.25	44	560	600	2800
54	59.25	9.75	1.25	44	580	620	3000
60	65.25	10.25	1.25	48	680	730	4000
66	71.25	11.5	1.25	56	830	1000	5175
72	77.75	12.75	1.25	64	1075	1400	6650
84	91.5	13.75	1.38	72	1550	2250	–
96	103.5	14.25	1.38	88	1950	2600	–

Dimensions are in inches. Weights are in pounds.

Note:
Sizes are nominal inside diameters of pipe or shell used with Welding Neck flanges, and nominal OD of pipe or shell used with Slip-On flanges. Larger sizes, as well as intermediate sizes, can be furnished.

Bolt lengths are calculated based on bolting on slip-on to one blind. Any other bolting combination will cause variance in bolt length.

Bolt hole diameter 1/8in. larger than bolt diameter

Class 175 Flange PDF (for printing).