INDUSTRY STANDARD FLANGES Class 125 – Welding Neck Flanges

Nominal
Size
NPS

Outside
Diameter
of
Flange

Thickness
of
Flange

Length
thru
Hub

Diameter Of Hub At Base

Diameter Of Raised
Face

Diameter
of
Bolt
Circle

Number of
Bolt Holes

Diameter
of
Bolt
Holes

A

O

C

Y

X

R

26	in.	34.25	2	5	28.5	29.5	31.75	24	1.38
	mm	870	50.8	127	723.9	749.3	806.5		35.1
28	in.	36.5	2.06	5.06	30.75	31.5	34	28	1.38
	mm	927.1	52.3	128.5	781.1	800.1	863.6		35.1
30	in.	38.75	2.13	5.13	32.75	33.75	36	28	1.38
	mm	984.3	54.1	130.3	831.9	857.3	914.4		35.1
32	in.	41.75	2.25	5.25	35	36	38.5	28	1.63
	mm	1060.5	57.2	133.4	889	914.4	977.9		41.4
34	in.	43.75	2.31	5.31	37	38	34.25	32	1.63
	mm	1111.3	58.7	134.9	939.8	965.2	870		41.4
36	in.	46	2.38	5.38	39.25	40.25	42.75	32	1.63
	mm	1168.4	60.5	136.7	997	1022.4	1085.9		41.4
38	in.	48.75	2.38	5.38	41.75	42.25	45.25	32	1.63
	mm	1238.3	60.5	136.7	1060.5	1073.2	1149.4		41.4
40	in.	50.75	2.5	5.5	43.75	44.25	47.25	36	1.63
	mm	1289 1	63.5	139.7	1111.3	1124	1200.2		41.4
42	in.	53	2.63	5.63	46	47	49.5	36	1.63
	mm	1346.2	66.8	143	1168.4	1193.8	1257.3		41.4
44	in.	55.25	2.63	5.63	48	49	51.75	40	1.63
	mm	1403.4	66.8	143	1219.2	1244.6	1314.5		41.4
46	in.	57.25	2.68	5.68	50	51	53.75	40	1.63
	mm	1454.2	68.1	144.3	1270	1295.4	1365.3		41.4
48	in.	59.5	2.75	5.75	52.25	53.5	56	44	1.63
	mm	1511.3	69.9	146.1	1327.2	1358.9	1422.4		41.4
50	in.	61.75	2.75	5.75	54.25	55.5	58.25	44	1.88
	mm	1568.5	69.9	146.1	1378	1409.7	1479.6		47.8
52	in.	64	2.88	5.88	56.5	57.5	mm	44	1.88
	mm	1625.6	73.2	149.4	1435.1	1460.5	1536.7		47.8
54	in.	66.25	3	6	58.75	59.75	62.75	44	1.88
	mm	1682.8	76.2	152.4	1492.3	1517.7	1593.9		47.8
60	in.	73	3.13	6.13	65.25	66	69 25	52	1.88
	mm	1854.2	79.5	155.7	1657.4	1676.4	1759		47.8

(1) Bore diameter to be specified by purchaser.

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