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Fitting Guide

Dimensions Butt Welded Reducing Tees ASME B16.9 NPS 1/2 to 48

Reducing Tee ASME b16.9

Other Diameters

NPS O.D.
D
O.D.
D1
Center to End
C
Center to End
M
5 - 2 141.3 60.3 124 105
5 - 2½ 141.3 73 124 108
5 - 3 141.3 88.9 124 111
5 - 3½ 141.3 101.6 124 114
5 - 4 141.3 114.3 124 117
6 - 2½ 168.3 73 143 121
6 - 3 168.3 88.9 143 124
6 - 3½ 168.3 101.6 143 127
6 - 4 168.3 114.3 143 130
6 - 5 168.3 141.3 143 137
8 - 3½ 219.1 101.6 178 152
8 - 4 219.1 114.3 178 156
8 - 5 219.1 141.3 178 162
8 - 6 219.1 168.3 178 168
10 - 4 273 114.3 216 184
10 - 5 273 141.3 216 191
10 - 6 273 168.3 216 194
10 - 8 273 219.1 216 203
12 - 5 323.8 141.3 254 216
12 - 6 323.8 168.3 254 219
12 - 8 323.8 219.1 254 229
12 - 10 323.8 273 254 241
14 - 6 355.6 168.3 279 238
14 - 8 355.6 219.1 279 248
14 - 10 355.6 273 279 257
14 - 12 355.6 323.8 279 270
16 - 6 406.4 168.3 305 264
16 - 8 406.4 219.1 305 273
16 - 10 406.4 273 305 283
16 - 12 406.4 323.8 305 295
16 - 14 406.4 355.6 305 305

Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer.

Reducing Tee ASME b16.9

Dimensional Tolerances Reducing Tees ASME B16.9

Nominal Pipe Size

1/2 to 2½

3 to 3½

4

5 to 8

10 to 18

20 to 24

26 to 30

32 to 48

Outside Dia
at Bevel (D)

+1.6
-0.8

1.6

1.6

+2.4
-1.6

+4
-3.2

+6.4
-4.8

+6.4
-4.8

+6.4
-4.8

Inside Dia at End

0.8

1.6

1.6

1.6

3.2

4.8

+6.4
-4.8

+6.4
-4.8

Center to End (C / M)

2

2

2

2

2

2

3

5

Wall Thk (t)

Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted.

Note:
MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 - NPS 24. Except with regard to the outside diameter at the bevel.

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