How do you measure a Bimba. Is it from the top of the shaft to the bottom or is it between the two pneumatic fittings?
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What are you asking to measure? The overall length at each extreme (shortest and longest)?
I’ve never seen an iron cylinder but would like to 
If you are asking how you measure a cylinder, it’s the amount of shaft extension. For example a 10" 3/4" cylinder would be a cylinder with a 3/4" diameter piston and a shaft with a delta of 10".
A cylinder is usually never measured from the distance between the fittings. It’s generally the stroke length.
I agree with all above. The stroke length is the difference between its greatest length and its shortest length, and the bore is the inside diameter of the tube/body. If you put the part number into Bimba’s website, you can look up the full drawings similar to the one @BordomBeThyName posted above, or even the CAD in several formats.
For most Bimba cylinders, including those available from vouchers in recent years, the numeric part of the part number will tell you the bore and stroke, and the letters will tell you the mounting style, materials, and other options. The first two digits (or the first three digits if the first two are 00) tells you the approximate cross sectional area of the bore, in tenths (hundredths) of square inches; if you multiply this number by your working pressure (commonly 60psi in FRC), you get your output force on extenstion. The rest of the numbers are the stroke length in inches.
Examples of some cylinders I recall using (and re-using):
- 0912-DX: 09 corresponds to 1-1/16" diameter (area=0.866in²) and 12" stroke. DX is double stroke, X is universal mount on the original line.
- FO502: 50 corresponds to 2.5" diameter bore (area=4.91in²) and 2" stroke. FO is the compact line, double acting with single end rod.
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