Metric Dimensions of Weld Neck Flange Rating 300 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
1/29512.738
3/411514.348
112515.954
1-1/413517.564
1-1/215519.170
216520.784
2-1/219023.9100
321027117
3-1/223028.6133
425530.2146
528033.4178
632035206
838039.7260
1044546.1321
1252049.3375
NPSOtfX
1458552.4425
1665055.6483
1871058.8533
2077562587
2491568.3702

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Weld Neck Flange Dimensions
Weld Neck Flange Dimensions

NPSAYB
1/221.35115.8
3/426.75620.9
133.46026.6
1-1/442.26435.1
1-1/248.36740.9
260.36852.5
2-1/2737562.7
388.97877.9
3-1/2101.67990.1
4114.384102.3
5141.397128.2
6168.397154.1
8219.1110202.7
10273116254.6
12323.8129304.8
NPSAYB
14355.6141BY P
16406.4144BY P
18457157BY P
20508160BY P
24610167BY 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
3-1/2184.27/883/4
4200.07/883/4
5235.07/883/4
6269.97/8123/4
8330.21127/8
10387.41-1/8161
12450.81-1/4161-1/8
NPSBCDBHDBOLTSBD
14514.41-1/4201-1/8
16571.51-3/8201-1/4
18628.61-3/8241-1/4
20685.81-3/8241-1/4
24812.81-5/8241-1/2

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Flange Drilling Template
Flange Drilling Template

NPSSBL RFYSBL RJMBL RF
1/2657555
3/4759065
1759065
1-1/4859570
1-1/29010075
29010075
2-1/210011585
311012090
3-1/211012595
411512595
5120135110
6120140110
8140150120
10160170140
12170185145
NPSSBL RFYSBL RJMBL RF
14180190160
16190205165
18195210170
20205220185
24230255205

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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.