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I want to be able to hold a 1/2" diameter shank boring bar on my existing lathe tool post but don't know how to buy the correct one.

The post we have is a Phase II 250-111: https://www.mscdirect.com/product/details/09044017?item=09044017

The boring bars we have a 1/2" shank diameter. I'm hoping to get a different brand for the tool holder because it is cheaper. Which of the options below would fit? I'm confused by the OXA or AXA as I don't see that specified in the post description from Phase II. https://www.mscdirect.com/product/details/30579627 https://www.mscdirect.com/product/details/30574867

or even https://www.amazon.com/Quick-Change-Boring-Holder-250-004/dp/B07THWWQQD

or an even cheaper option: https://www.amazon.com/Boring-Bar-Holder-1-2/dp/B077V5HKNR

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Lathe quick change tool posts or QCTP are sized for the lathe your using it on, particularly, the swing.

0XA = UP TO ~8" AXA = 9-12" BAX = 12-15" and so forth...

Looks like you have a phase 2, 100 series post, or an AXA sized tool post, so you would be looking for AXA tool holders. I believe a standard AXA boring bar holder is for 3/4" shank so you'd need a bushing. You can also purchase a standard tool holder that has a v grove at the bottom of the tool slot that can hold your boring bar.

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