Easton Chart decoding

[Bladepeek]

I realize this may not be the least bit important, but I'd like to be able to de-cypher the numbers in Easton's arrow chart. Is one pair of the numbers the diameter and the other the spine, or wall thickness, or just a model number that is somewhat random? Maybe if I got an Easton catalog, they would tell me, but I figure with all this expertise hanging out on the forum, maybe you all could save me some trouble looking :>)

[cbCrow]

Lets use an 1816 arrow. The 18 means 18/64" or the diameter of the shaft. The 16 means that the wall of the shaft is 16/1000s of an inch thick. Hope this helps.

[Reaper TN]

Ron, the number of the arrow itself gives you quite a bit of information.  Take for example a 2117.  The first two digits is the arrow diameter in 64ths of an inch, 21/64.  The next two digits is the wall thickness of the aluminum, .017 in thousandths.  The spine number is a number used to give a person an idea how "stiff" an arrow is.
An arrow is supported 28 inches apart and a standard weight hung in the middle.  The amount that the arrow "bends" or its deflection in thousandths is the number in the spine column.  A 2117 has a spine of .400.  Grains per inch is pretty self explanatory, the 2117 is 12 grains per inch and a 29 inch 2117 shaft weighs 348 grains.  Go to Eastons website and you can download a copy of their arrow charts, that's what I did.

[Bladepeek]

Thanks to both of you. Makes sense. That helps complete the pattern when they list 4 or 5 shafts for a given draw weight and length. Now I can get an idea of where I might want to go when ordering some shafts for bare shaft tuning and think I might want to use a broadhead slightly heavier than normal for my hunting bow. I'm shooting a 62" Indian recurve with no poundage marked, but I'm betting it's 34 - 36# at 29" for my warmup. Then I go to a 42# Bear Polar for my regular shooting. I'm waiting for a string I ordered for a 60" 46# Browning Safari II. When I start getting tired and sloppy, I go back to the light one for another half dozen shots. The back is coming slowly, but your muscles don't build rapidly when you're nearly 70 and haven't shot since high school :-(