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

3 4 Lathe Internal Boring Bar Turning Tool Holder S20r

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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₩97441

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Description

⚙️ Elevate Your Lathe Game with Precision & Power!

PRECISION ENGINEERED FIT - 3/4" (20mm) shank diameter ensures seamless integration with your lathe setup for flawless internal boring.
COMPLETE READY TO USE KIT - Comes with the boring bar, 10 premium inserts, and a wrench—everything you need to upgrade your machining workflow instantly.
TRUSTED INDUSTRY STANDARD - Ranked #8 in Turning Inserts and backed by Xuzhou Bai Yi Metal Technology Co., this tool holder is a must-have for professionals who demand reliability.
DURABILITY MEETS PERFORMANCE - Crafted from nickel-coated alloy steel, this boring bar offers exceptional toughness and wear resistance to power through demanding jobs.
CARBIDE INSERTS WITH TI N COATING - Includes 10 indexable WNMG080408 carbide inserts, delivering superior hardness, low friction, and chemical stability for ultra-precise finishing.

The 3/4" Lathe Internal Boring Bar S20R-MWLNR08 is a high-performance turning tool holder made from nickel-coated alloy steel, paired with 10 TiN-coated carbide inserts (WNMG080408) designed for finishing and semi-finishing. With a 20mm shank diameter and 200mm length, it offers durability, precision, and wear resistance, making it ideal for professional-grade internal boring tasks.

Specifications

ASIN	B07Z9XZNX8
Best Sellers Rank	#55,380 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #8 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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