Can this be used in a boring bar holder on a milling machine, or is it only for a lathe?

If you are asking if it can be used in a boring head the answer is no. As this is a right-hand boring bar and you would have to run the machine in reverse to get it to cut. If you ran it in reverse without some sort of mod to the boring head the head would unscrew from the shank as soon as you began to cut causing a spectacular crash. You need a left-hand bar. With that you can run in forward with no worries.

is this actually a 3/4" or a 20mm, i need a 3/4.

3/4'' is the size of the shank itself. I don't think it would be a mm bigger as most common lathe/mill tools are inch instead of mm

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3/4" boring bar

Product ID: 170567829

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💎10 carbide inserts

🔩3/4" shank diameter

⚙️8" length

Description

🔧 Elevate Your Machining Game with Precision and Power!

VERSATILE INSERTS - Includes 10 WNMG080408 CNC inserts for diverse machining applications.
ENHANCED PERFORMANCE - TiN-coated inserts ensure low friction and high wear resistance.
PROFESSIONAL QUALITY - Ideal for finishing and semi-finishing work, elevating your machining game.
USER FRIENDLY DESIGN - Comes with a wrench for easy adjustments and maintenance.
PRECISION ENGINEERING - Crafted from high-quality alloy steel for unmatched durability.

The ASZLBYM 3/4" Lathe Internal Boring Bar Turning Tool Holder S20R-MWLNR08 is engineered for high-performance machining. It features a robust alloy steel construction with a nickel coating for enhanced toughness and wear resistance. The package includes 10 indexable carbide inserts designed for precision cutting, making it perfect for both finishing and semi-finishing tasks. With a user-friendly design and professional-grade quality, this tool holder is a must-have for any serious machinist.

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