Metric Dimensions of Weld Neck Flange Rating 400 as per ASME B16.5

Weld Neck Flange Dimensions
Weld Neck Flange Dimensions
Metric Dimensions
150 300 400 600 900 1500 2500
Inch Dimensions
150 300 400 600 900 1500 2500

NPSOtfX
1/29514.338
3/411515.948
112517.554
1-1/413520.764
1-1/215522.370
216525.484
2-1/219028.6100
321031.8117
3-1/223035133
425535146
528038.1178
632041.3206
838047.7260
1044554321
1252057.2375
NPSOtfX
1458560.4425
1665063.5483
1871066.7533
2077569.9587
2491576.2702

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Weld Neck Flange Dimensions
Weld Neck Flange Dimensions

NPSAYB
1/221.3523
3/426.7573
133.4623
1-1/442.2675
1-1/248.3706
260.3738
2-1/273798
388.98310
3-1/2101.68610
4114.389BY P
5141.3102BY P
6168.3103BY P
8219.1117BY P
10273124BY P
12323.8137BY P
NPSAYB
14355.6149BY P
16406.4152BY P
18457165BY P
20508168BY P
24610175BY P

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Templates for drilling of bolt holes

Flange Drilling Template
Flange Drilling Template

NPSBCDBHDBOLTSBD
1/266.75/841/2
3/482.63/445/8
188.93/445/8
1-1/498.43/445/8
1-1/2114.37/843/4
2127.03/485/8
2-1/2149.27/883/4
3168.37/883/4
3-1/2184.2187/8
4200.0187/8
5235.0187/8
6269.91127/8
8330.01-1/8121
10387.41-1/4161-1/8
12450.81-3/8161-1/4
NPSBCDBHDBOLTSBD
14514.41-3/8201-1/4
16571.51-1/2201-3/8
18628.61-1/2241-3/8
20685.81-5/8241-1/2
24812.81-7/8241-3/4

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Flange Drilling Template
Flange Drilling Template

NPSSBL RFYSBL RJMBL RF
1/2757075
3/4908590
1908590
1-1/4959095
1-1/2110100110
2110100110
2-1/2120115120
3125120125
3-1/2140135140
4140135140
5145135145
6150145150
8170165170
10190185190
12205195205
NPSSBL RFYSBL RJMBL RF
14210205210
16220215220
18230220230
20240235250
24265260280

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Metric Dimensions
150 300 400 600 900 1500 2500
Inch Dimensions
150 300 400 600 900 1500 2500

General Notes

Dimensions are in millimeters, except for diameters of bolts and bolt holes, which are in inch units.