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Fitting Guide

Dimensions Butt Weld Elbows 180° LR and SR ASME B16.9

Elbows 180° long and short Radius
NPS O.D.
D
180° Long Rad 180° Short Rad
Center to
Center
O
Back to
Face
K
Center to
Center
O
Back to
Face
K
1/2 21.3 76 48    
3/4 26.7 76 51    
1 33.4 76 56 51 41
1.1/4 42.2 95 70 64 52
1.1/2 48.3 114 83 76 62
2 60.3 152 106 102 81
2.1/2 73 190 132 127 100
3 88.9 229 159 152 121
3.1/2 101.6 267 184 178 140
4 114.3 305 210 203 159
5 141.3 381 262 254 197
Elbows 180° long and short Rad
NPS O.D.
D
180° Long Rad 180° Short Rad
Center to
Center
O
Back to
Face
K
Center to
Center
O
Back to
Face
K
6 168.3 457 313 305 237
8 219.1 610 414 406 313
10 273 762 518 508 391
12 323.8 914 619 610 467
14 355.6 1067 711 711 533
16 406.4 1219 813 813 610
18 457 1372 914 914 686
20 508 1524 1016 1016 762
22 559 1676 1118 1118 838
24 610 1829 1219 1219 914

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

Dimensional Tolerances of Butt Weld Elbows 180° LR and SR ASME B16.9

Nominal Pipe Size 1/2 to 2.1/2 3 to 3.1/2 4
Outside Diameter
at Bevel (D)
+ 1.6
- 0.8
1.6 1.6
Inside Diameter at End 0.8 1.6 1.6
Center to Center (O) 6 6 6
Back to Face (K) 6 6 6
Nominal Pipe Size 5 to 8 10 to 18 20 to 24
Outside Diameter
at Bevel (D)
+ 2.4
- 1.6
+ 4
- 3.2
+ 6.4
- 4.8
Inside Diameter at End 1.6 3.2 4.8
Center to Center (O) 6 10 10
Back to Face (K) 6 6 6
Wall Thickness (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.

Elbows 180 degrees Long and Short radius ASME B16.9
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