Unusual aluminum shafting Help!

[PhilNY]

A friend passed away a few years ago and had owned an archery shop in 1960. His daughter said that they still had some items left and needed them identified. There were dozens and more dozens of 24srtx easton shafting and xx75 plain aluminum and almost all were in target sizes. The wrapping from easton was still on them as was the 30 cent postage on each dozen and his price of 12.00 a DZ.
 
But then there were these plain aluminum shafts that had no markings but looked like 1830 or something, the walls were the thickest things I have ever seen maybe even 0.040" thick and boy were they heavy.

Guy had told me that he had some shafts around that were an experiment for fishing arrows and didn't work out, so maybe these are them. I did find lots of solid aluminum fishing arrows also. Any idea what these might be?
Phil

1913, 1918, and 1820, were some of the odd sizes of some of the xx75's, we stopped counting at 15 dozen.

[bowhunterfrompast]

I can't help but maybe a picture will help the more experienced collectors.

[bearmagtd]

Easton did make shafts that where 1820, 1920 and 2020 size in the 60's. heavy shafts with thick wall size.

[oldbohntr]

.020 is the thickest of the small diameter silver color shafting I have ever found(1920 and 1820). A micrometer or digital caliper will tell you what you likely have.  Depending on the shape of your measuring tool you may have to estimate the ID.

[PhilNY]

I'll take a pic and measure it when I get back. It looks twice as thick as the 2020 in wall thickness and there no markings at all, in any case, they seem too soft to be anything better than 24srt-x's, so probably not much good for anything. I will weigh one also. I have inside and reg mic's so when I get back there I can get more info, and now that I figured out how to do pics Im good to go.
Thank you all for the quick responses.
Phil

Phil

[Kelly]

Eastons lowest grade aluminum shafting at that time was called Swift and did not have any marking on the shaft-should be on the packages if they still are wrapped the way they came from Easton.

That said, Easton did make some aluminum fishing shafts-they make a 2040 still so wouldn't surprise me that they could have made an 1830.

[PhilNY]

They were 2040's when measured and some had holes drilled for fishing, but they were so soft that you could bend them easily by just flexing them probably good for planting tomatoes. Thank you.