What are the blade specs? We know its 4.5" but what is the center hole size?

The arbor hole is 3/8" which makes the blades harder to find at the local hardware store. There is no adapter included, but also note that Dewalt clearly states not to use abrasive blades as that could overheat the motor.

What are the main differences between this and let's say the 7 1/4 inch circular saw? The cut depths are not that different.

It barely cuts through 2x lumber (1-9/16) that's only a 1/16 over the depth of 2x lumber, so I don't use it for that, personally. It's a wonderful "grab and go" saw for 1x material and sheet goods. I'm a homeowner weekend warrior user, so I'm not using it daily. But, so far it's cut through everything well and you can easily use it with one hand. I also have the 7-1/4 saw and use it when I cut 2x material as it will cut 1 inch deeper.

What's the part number for a compatible dust bag?

A dust port is included to connect to a vacuum. The port part number is N594300

can i use the dewalt battery from my cordless drill to power this saw?

Yes, if the battery of your cordless drill is 20v also. Batteries of all 20v tools, I believe, can be used to power any other 20v cordless tools.

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ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool Only (DCS571B)

Product ID: 158647542

Details

Blade Material
High Speed
Brand
DEWALT
Color
Black
Power Source
Battery
Surface Recommendation
Wood

⚡Brushless motor for max efficiency

📏Cuts up to 369 linear feet per charge

🛠️Bevel gear for precise 45° & 90° cuts

$U14979

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Description

⚡ Cut smarter, not harder — Own the job site with DEWALT’s Atomic power!

CUT YOUR WAY - Bevel lever and gear enable flawless 45° and 90° cuts on 1x and 2x lumber, perfect for versatile project demands.
READY WHEN YOU ARE - On-board blade key storage and hang hook keep your essentials close, minimizing downtime and maximizing productivity.
POWER MEETS PRECISION - Brushless motor delivers longer runtime and smoother cuts, powering through 369 linear feet of 3/4 in. OSB on a single charge.
CLEAN SAFE WORKSPACE - Electronic blade brake stops the blade instantly, while the integrated dust port keeps your work area tidy and professional.
CONTROL AT YOUR FINGERTIPS - Ergonomic 1-1/2 in. finger trigger and removable auxiliary handle give you ultimate grip and maneuverability.

The DEWALT ATOMIC 20V MAX* 4-1/2 inch Circular Saw is a compact, brushless cordless tool designed for professional-grade precision and efficiency. Compatible with 20V MAX* batteries, it delivers up to 369 linear feet of cutting on 3/4 inch OSB per charge. Featuring bevel capabilities for 45° and 90° cuts, an ergonomic trigger, on-board blade key storage, and an electronic blade brake, this saw combines power, control, and safety in a lightweight 6.6-pound package backed by a 3-year warranty.

Specifications

ASIN	B07VYLSYQ6
Best Sellers Rank	#16,766 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #11 in Power Circular Saws
Blade Length	2 inches
Blade Material	High Speed Steel
Blade Shape	Rectangular
Brand Name	DEWALT
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (7,679)
Cutting Angle	90 degrees
Global Trade Identification Number	00885911592239
Handle Material	Plastic
Included Components	(1) DCS571 20V MAX* Brushless 4-1/2 in. Circular Saw; (1) Wood cutting blade; (1) Blade change key; (1) Dust port adaptor; (1) Rip fence
Item Dimensions L x W x H	17.88"L x 5.13"W x 6.69"H
Item Type Name	Circular Saw
Item Weight	6.6 pounds
Manufacturer	DEWALT
Manufacturer Part Number	DCS571B
Manufacturer Warranty Description	3 yr warranty on material and workmanship
Model Number	DCS571B
Number of Batteries	1 Lithium Ion batteries required.
Number of Items	1
Number of Teeth	24
Other Special Features of the Product	Brake, Brushless
Power Source	Battery Powered
Specification Met	CSA
Surface Recommendation	Wood
UPC	885911592239
Unit Count	1 Count
Voltage	20 volts
Warranty Type	Limited Warranty

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