Flanges to American Standards (ANSI) - National Pump & Energy

NOM FLANGE SIZE		PN20 (CLASS 150)						PN50 (CLASS 300)
DN	NPS	DIA.	PCD	NO. BOLTS	DIA. BOLTS	STUD SIZE	BOLT SIZE	DIA.	PCD	NO. BOLTS	DIA. BOLTS	STUD SIZE	BOLT SIZE
15	1/2	90	60.5	4	1/2	60	45	95	66.5	4	1/2	65	55
20	3/4	100	70	4	1/2	65	50	120	82.5	4	5/8	75	60
25	1	110	79.5	4	1/2	65	55	125	89	4	5/8	80	65
32	1(1/4)	120	89	4	1/2	70	55	135	98.5	4	5/8	80	65
40	1(1/2)	130	98.5	4	1/2	70	60	155	114.5	4	3/4	90	75
50	2	150	120.5	4	5/8	80	65	165	127	8	5/8	90	75
65	2(1/2)	180	139.5	4	5/8	90	75	190	149	8	3/4	100	85
80	3	190	152.5	4	5/8	90	75	210	168.5	8	3/4	110	90
90	3(1/2)	215	178	8	5/8	90	75	230	184	8	3/4	110	95
100	4	230	190.5	8	5/8	90	75	255	200	8	3/4	110	95
125	5	255	216	8	3/4	90	80	280	235	8	3/4	120	100
150	6	280	241.5	8	3/4	100	85	320	270	12	3/4	125	105
200	8	345	298.5	8	7/8	110	90	380	330	12	7/8	140	110
250	10	405	362	12	1	115	95	445	387.5	16	1	155	130
300	12	485	432	12	11/8	120	100	520	451	16	1(1/4)	170	145
350	14	535	476	12	11/8	130	110	585	514.5	20	11/8	175	150
400	16	600	540	16	1(1/4)	135	115	650	571.5	20	1(1/4)	190	160
450	18	635	578	16	1(1/4)	150	125	710	628.5	24	1(1/4)	195	170
500	20	700	635	20	1(1/4)	160	135	775	686	24	15/8	205	180
600	24	815	749.5	20	1(1/2)	175	145	915	813	24	1(1/2)	230	195
750	30	985	914	28	1(3/4)	190	160	1090	997	28	1(3/4)	290	250
900	36	1170	1086	32	2	215	180	1270	1168	32	2(1/2)	325	280

NOM FLANGE SIZE		PN100 (CLASS 600)
DN	NPS	DIA.	PCD	NO. BOLTS	DIA. BOLTS	STUD SIZE
15	1/2	95	66.5	4	1/2	80
20	3/4	120	82.5	4	5/8	90
25	1	125	89	4	5/8	90
32	1(1/4)	135	98.5	4	5/8	100
40	1(1/2)	155	114.5	4	3/4	105
50	2	165	127	8	5/8	105
65	2(1/2)	190	149	8	3/4	120
80	3	210	168.5	8	3/4	125
90	3(1/2)	230	184	8	7/8	140
100	4	275	216	8	7/8	145
125	5	330	267	8	1	165
150	6	355	292	12	1	170
200	8	420	349	12	11/8	195
250	10	510	432	16	1(1/4)	215
300	12	560	489	20	1(1/4)	220
350	14	605	527	20	13/8	235
400	16	685	603	20	1(1/2)	255
450	18	745	654	20	15/8	275
500	20	815	724	24	15/8	290
600	24	940	838	24	17/8	330
750	30	1130	1022	28	2	355
900	36	1315	1194	28	2(1/2)	400

PN150 (CLASS 900)
DIA.	PCD	NO. BOLTS	DIA. BOLTS	STUD SIZE
120	82.5	4	3/4	105
130	89	4	3/4	115
150	101.5	4	7/8	125
160	111	4	7/8	125
180	124	4	1	140
215	165	8	7/8	145
245	190	8	1	160
240	190.5	8	7/8	145

TEMPERATURE/PRESSURE RATINGS

TEMPERATURE IN C°		MAXIMUM WORKING TEMPERATURE
DN	PN20 CLASS 150	PN50 CLASS 300	PN100 CLASS 600	PN150 CLASS 900
-29 to 38	1960	5110	10210	15320
50	1920	5010	10020	15020
100	1770	4640	9280	13910

NPE provides these calculators and guides to assist with general queries and recommends working with experts to ensure suitability.
NPE assumes no responsibility or liability for any errors, omissions or misuse of the contents of this site.
These online tools do not constitute professional advice.
For assistance, contact any of NPE’s Australian branches.

Get in touch to discuss your requirements...

Call Us

NPE has not only one of the largest ranges of specialised equipment, but also the most qualified professionals in pumping and power generation in Australia.

Visit A Location

The NPE branch network is strategically positioned to service all parts of Australia. These hire branches are supported by a team of NPE representatives and field service crews.