The function of a 45° elbow is the same as a 90° elbow,but the measurement of dimensions is different to that of the 90° elbow.The radius of a 45° elbow is the same as the radius of the 90° LR (1.1/2D).However,the center to face dimension is not equivalent to the radius as in 90° LR elbows.This is measured from each face to the point of intersection of the center lines perpendicular to each other,distances B on the image.This is due to the smaller degree of bend.Short radius 45° elbows are not available.
| NPS | Outside Diameter | A(Center to End) |
| 16 | 16 | 24 |
| 18 | 18 | 27 |
| 20 | 20 | 30 |
| 22 | 22 | 33 |
| 24 | 24 | 36 |
| 26 | 26 | 39 |
| 660.4 | 660.4 | 990.6 |
| 28 | 28 | 42 |
| 30 | 30 | 45 |
| 32 | 32 | 48 |
| 34 | 34 | 51 |
| 36 | 36 | 54 |
| 38 | 38 | 57 |
| 40 | 40 | 60 |
| 42 | 42 | 63 |
| 44 | 44 | 66 |
| 46 | 46 | 69 |
| 48 | 48 | 72 |
| 50 | 50 | 75 |
| 52 | 52 | 78 |
| 54 | 54 | 81 |
| 56 | 56 | 84 |
| 58 | 58 | 87 |
| 60 | 60 | 90 |