WHAT IS A BUTTWELD 45 DEGREE ELBOW?
The function of a Buttweld 45 Degree Elbow is the similar 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 (1D). 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.