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

S20r Mwlnr08 | Desertcart Bolivia

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Description

⚙️ Elevate your turning game with precision and durability!

VERSATILE 3 4 SHANK - Fits standard lathes with an 8" length for deep internal boring
COMPLETE PROFESSIONAL KIT - Includes 10 CNC inserts and wrench for immediate use
OPTIMIZED CARBIDE INSERTS - TiN-coated WNMG080408 inserts deliver low friction and chemical stability
TRUSTED INDUSTRIAL PERFORMANCE - Ranked #6 in Turning Inserts, engineered for high-precision machining
PRECISION ENGINEERED ALLOY STEEL - Nickel-coated for superior toughness and wear resistance

The S20R-MWLNR08 Lathe Internal Boring Bar is crafted from nickel-coated alloy steel for exceptional toughness and wear resistance. It features a 3/4" diameter shank and an 8" length, designed for precise internal boring. The package includes 10 TiN-coated carbide WNMG080408 inserts optimized for finishing and semi-finishing, ensuring low friction and chemical stability. Ideal for professional machinists seeking reliable, high-precision tooling.

Specifications

ASIN	B07Z9XZNX8
Best Sellers Rank	#43,254 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Turning Inserts
Date First Available	October 18, 2019
Item Weight	1.19 pounds
Item model number	S20R-MWLNR08 + WNMG432
Manufacturer	Xuzhou bai yi metal Technology Co., Ltd
Package Dimensions	8.98 x 4.33 x 2.24 inches

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