Approximately how much weight would this motor be able to "lift" vertically? Over 100 lbs?

Typically, you'd need to connect this to a lead screw or rack and pinion in order to convert the rotational motion into linear motion ("lifting"). Let's say you used a lead screw 5 turns-per-inch x .5" diameter. That lead screw with this motor properly driven would theoretically be able to lift a 750lb weight.

What is the pinout? I have red, yellow, green and blue wires. How does that map to a+- and b+-?

I don't recall the pairs by color on these, but you can tell by touching two wires together. Spin the spindle, it should spin freely. Touch two of the 4 wires together and try to turn the spindle again. If the spindle has resistance and harder to spin when touched together then those two wires are paired. It won't matter which you consider positive or negative of the two, since its DC, to my knowledge at least. Hope this helps.

cant read dimension from picture on here, but wanted to start milling the mounting plate before it arrives in 2 weeks, how can I get those specs?

The meeting services standard nema34 look up the standard. The shaft unfortunately is a 14 mm shaft with a key in it. I can find no 14 mm police online that already had a keyway in it. I am buying the keyway tool. If you order this motor others like it for a very small charged you can ship them to me I will put the keyway in it and send it to you. Probably going to be cheaper than trying to find a local machinist to do it

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Nema 34 Stepper Motor 6A 8.5Nm (1200 oz-in) 118mm Length for CNC Router Mill Lathe, Black

Product ID: 341038778

Details

Brand
Speed
100 RPM
Voltage
36 Volts 500
Horsepower
100 Watts
Material
Alloy Steel

📏118mm compact length

🔋6A rated current for precision

⚙️8.5Nm torque powerhouse

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€ 219.37

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Description

⚡ Power your precision projects with the torque titan!

BUILT TO ENDURE - Robust alloy steel construction and insulation resistant to 500V DC for long-lasting reliability.
COMPACT YET MIGHTY - Slim 118mm length fits seamlessly into tight builds without sacrificing performance.
TORQUE THAT COMMANDS - 8.5Nm (1204 oz-in) holding torque delivers unmatched power for heavy-duty milling and routing.
OPTIMIZED FOR CONTROL - 6A rated current and low resistance/inductance phases enable responsive, efficient motor control.
PRECISION IN EVERY STEP - 1.8° step angle ensures ultra-smooth, accurate motion for flawless CNC machining.

The Nema 34 Stepper Motor by HobbyUnlimited is a high-torque, precision-engineered motor designed for professional CNC routers, mills, and lathes. Featuring a compact 118mm length, 8.5Nm holding torque, and a 1.8° step angle, it delivers smooth, powerful motion with reliable durability thanks to its alloy steel build and advanced electrical insulation.

Specifications

Manufacturer	HobbyUnlimited
Item Weight	3.6 Kilograms
Package Dimensions	29.21 x 17.53 x 13.97 cm; 3.6 kg
Color	Black
Material	Alloy Steel
Voltage	36 Volts, 500 Volts
Horsepower	100 Watts
Item Package Quantity	1
Speed	100 RPM
Batteries Included?	No
Batteries Required?	No

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