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using diagonal 4:4 ratio & getting distance between one point to another & getting half of this value.
Center to end dimension given in dimension tables for 45-degree elbow must be divided by Tan(22.5) to get the elbow radius for a standard 45-degree elbow.
625 x pipe size (don't use the 25.4 factor, unless you are using millimeters) should give you a ballpark for a 45 fitting.
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 (1½D). 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.
The center-to-center dimension for a 45-degree bend is equal to the desired size of the offset times the 45 degree cosecant i.e 1.414
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