Wrought Steel Buttwelding Fittings (ASME)
Straight Tees and Caps
ASME B16.9
Nominal Pipe Size (NPS) Outside Center-to-End End-to-End
Diameter Straight Tees Caps
at Bevel Length (2) Limiting Wall Thickness for Length "E" Length (3)
OD C M (1) E E1
IN MM IN MM IN MM IN MM IN MM IN MM
½ 0.84 21.3 1 25 1 25 1 25 0.18 4.57 1 25
¾ 1.05 26.7 1.12 29 1.12 29 1 25 0.15 3.81 1 25
1 1.32 33.4 1.5 38 1.5 38 1.5 38 0.18 4.57 1.5 38
1.66 42.2 1.88 48 1.88 48 1.5 38 0.19 4.83 1.5 38
1.9 48.3 2.25 57 2.25 57 1.5 38 0.2 5.08 1.5 38
2 2.38 60.3 2.5 64 2.5 64 1.5 38 0.22 5.59 1.75 44
2.88 73 3 76 3 76 1.5 38 0.28 7.11 2 51
3 3.5 88.9 3.38 86 3.38 86 2 51 0.3 7.62 2.5 64
4 101.6 3.75 95 3.75 95 2.5 64 0.32 8.13 3 76
4 4.5 114.3 4.12 105 4.12 105 2.5 64 0.34 8.64 3 76
5 5.56 141.3 4.88 124 4.88 124 3 76 0.38 9.65 3.5 89
6 6.62 168.3 5.62 143 5.62 143 3.5 89 0.43 10.92 4 102
8 8.62 219.1 7 178 7 178 4 102 0.5 12.7 5 127
10 10.75 273 8.5 216 8.5 216 5 127 0.5 12.7 6 152
12 12.75 323.8 10 254 10 254 6 152 0.5 12.7 7 178
14 14 355.6 11 279 11 279 6.5 165 0.5 12.7 7.5 191
16 16 406.4 12 305 12 305 7 178 0.5 12.7 8 203
18 18 457.2 13.5 343 13.5 343 8 203 0.5 12.7 9 229
20 20 508 15 381 15 381 9 229 0.5 12.7 10 254
22 22 558.8 16.5 419 16.5 419 10 254 0.5 12.7 10 254
24 24 609.6 17 432 17 432 10.5 267 0.5 12.7 12 305
26 26 660.4 19.5 495 19.5 495 10.5 267 - - - -
28 28 711.2 20.2 521 20.2 521 10.5 267 - - - -
30 30 762 22 559 22 559 10.5 267 - - - -
32 32 812.8 23.5 597 23.5 597 10.5 267 - - - -
34 34 863.6 25 635 25 635 10.5 267 - - - -
36 36 914.4 26.5 673 26.5 673 10.5 267 - - - -
38 38 965.2 28 711 28 711 12 305 - - - -
40 40 1016 29.5 749 29.5 749 12 305 - - - -
42 42 1067 30 762 28 711 12 305 - - - -
44 44 1118 32 813 30 762 13.5 343 - - - -
46 46 1168 33.5 851 31.5 800 13.5 343 - - - -
48 48 1219 35 889 33 838 13.5 343 - - - -
NOTES:
(1) Outlet dimension M for NPS 26 and larger is recommended but not required.
(2) Length E applies for thickness not exceeding that given in column "Limiting Wall Thickness for Length E"
(3) Length E1 applies for thickness greater than that given in column "Limiting Wall 
Thickness for Length E" for NPS 24 and smaller.