what is the shaft length?

I`m not 100% sure but should be round 19mm

Is this a bipolar stepper?

Yes, you will a good stepper driver to run them

what maximum temperature could this stepper reach without causing damage to the stepper?

I do not know I have had them hot enough that you did not want to put your hands on them for every long and they are still running

Hi guys, i have two questions: what is the rpm of this motor and can i use that in a robot?

I mean, steppers in general don’t have a high rpm. Possibly gear it to fit your needs? You set the rpm via the stepper and controller. You can use anything for everything. How well it works, and if it’s logical, is up to you. If not, a regular dc motor and encoder would work better. Good results require hard work and trial and error. Good luck!

Nema 23 Stepper Motor 2.8A 1.9Nm (269oz.in) 76mm Length with 8mm Diameter of Shaft for CNC Mill Lathe Route(8mm Shaft)

Product ID: 269517943

Details

Brand
Item weight
1.03 Kilograms
Material
Copper
Product dimensions
6.4W x 7.6H
Voltage
36 Volts

📏76mm compact length

🔩8mm precision shaft

⚙️1.9Nm torque power

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Details

Brand
Item weight
1.03 Kilograms
Material
Copper

Description

⚙️ Elevate your CNC game with torque that means business!

DURABLE 8 MM SHAFT - Engineered with a sturdy 8mm diameter shaft for reliable, vibration-free motion control.
COMPACT YET MIGHTY - At just 76mm length, fits seamlessly into tight machine builds without sacrificing performance.
PREMIUM COPPER BUILD - Crafted with high-quality copper for superior conductivity and long-lasting durability.
OPTIMIZED VOLTAGE RANGE - Designed for 24-50VDC with 2.8A current, ensuring efficient and consistent power delivery.
POWERFUL PRECISION TORQUE - Delivers a robust 1.9Nm (269oz.in) torque for smooth, high-accuracy CNC operations.

The Nema 23 Stepper Motor by HobbyUnlimited offers a powerful 1.9Nm torque in a compact 76mm frame, featuring an 8mm precision shaft. Ideal for CNC mills, lathes, and routers, it supports 24-50VDC voltage and 2.8A current for efficient, reliable performance. Built with premium copper, this 1.1kg motor ensures durability and precision for professional-grade machining.

Specifications

ASIN	B07Y81FF3V
Brand	HobbyUnlimited
Brand Name	HobbyUnlimited
Item Dimensions W x H	6.4W x 7.6H centimeters
Item Weight	1.03 Kilograms
Item weight	1.03 Kilograms
Manufacturer	HobbyUnlimited
Material	Copper
Material Type	Copper
Product dimensions	6.4W x 7.6H centimeters
Voltage	36 Volts

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