90 degree
Formula for calculating center to end distance of such elbows is as follows: For 90° Long Radius elbows, center to end dimension given in dimension tables of ASME B16.9 is same as radius of elbow. This is because Tan (90/2) i.e. Tan 45 is 1. Normally custom elbow angles from 45 degree to 90 are cut from 90 degree standard elbow. If that's what you were asking about...
1/2 inch
4 1/2 inch
2 inches
Standard drill bit sizes in inches typically range from 1/16 inch to 1 inch, increasing in 1/64 inch increments.
1 inch = 2.54 centimetres.
The standard size of a bicycle chain is 1/2 inch pitch with a width of either 3/32 inch or 1/8 inch.
1 inch = 2.54 centimetres
The standard size of a pipe with a 1/2 inch diameter is typically referred to as 1/2 inch nominal pipe size (NPS).
The standard PVC conduit dimensions used in electrical installations are typically 1/2 inch, 3/4 inch, 1 inch, 1 1/4 inch, 1 1/2 inch, 2 inch, 2 1/2 inch, 3 inch, 3 1/2 inch, 4 inch, and larger. These sizes refer to the diameter of the conduit.
The standard bicycle chain dimensions are typically 1/2 inch pitch, 3/32 inch width, and 1/8 inch roller diameter.
The standard thread size for a tripod is usually 1/4 inch or 3/8 inch.