What size are rhe bullet connectors? 2 mm???

Dear,it's 3.5mm bullet connectors.

what size mounting screws do you use to mount these motors to the frame arms?

M39 M3 Hexagonal Hex Screws 9mm

What size Nuts do these motors use to hold on the props?

Dear,the size of Nuts to hold on props was M6 size.

None of the props I've tried work with this without modification. 1045 is a good size but the axle has flats and is ~8mm in diameter. Are there any?

You can have a try 1045 Self-Tightening Propellers: https://www.amazon.com/RAYCorp-Self-Tightening-10x4-5-Propellers-Pieces/dp/B07H1HXCGJ/ref=sr_1_12?keywords=1045+props&qid=1562035838&s=gateway&sr=8-12

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2212 920KV Brushless Motors CW CCW for F330 F450 F550 S500 S550 X525 DJI Phantom Quadcopter(4PCS)

Product ID: 46589035

Details

Brand
Readytosky
Model Name
f450 f550
Product Dimensions
1.1"W x 0.94"H
Speed
920 rpm
Voltage
12 volts

🔇Low noise & ultra-stable operation

🔌3.5mm bullet connectors for easy plug-n-play

⚙️920KV high-speed brushless power

€ 91.62

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚁 Elevate your drone game with power, precision, and plug-n-play ease!

PLUG PLAY CONVENIENCE - 3.5mm bullet connectors eliminate soldering hassles—get airborne faster.
WHISPER QUIET STABILITY - Fly with confidence thanks to motors engineered for minimal noise and maximum stability.
PRECISION BRUSHLESS POWER - Experience smooth, high-efficiency 920KV motor speed for superior flight control.
OPTIMIZED PROPELLER PAIRING - Pair with recommended 1045 propellers for peak performance and extended flight time.
UNIVERSAL FRAME COMPATIBILITY - Perfectly fits popular quadcopters like F330, F450, F550, S500, S550, and DJI Phantom series.

The Readytosky 2212 920KV Brushless Motors (4PCS) deliver high-speed, low-noise performance tailored for popular quadcopter frames including F330, F450, and DJI Phantom. Featuring 3.5mm bullet connectors for easy installation and compatibility with 1045 propellers, these metal motors offer reliable, stable flight dynamics for professional and hobbyist drone pilots alike.

Specifications

ASIN	B075DD16LK
Best Sellers Rank	#101,193 in Toys & Games ( See Top 100 in Toys & Games ) #77 in RC Electric Motors
Brand Name	Readytosky
Customer Reviews	4.3 4.3 out of 5 stars (251)
Item Dimensions W x H	1.1"W x 0.94"H
Item Weight	6.72 ounces
Manufacturer	Readytosky
Material Type	Metal
Model	(B46+B48)*X
Model Name	f450,f550
Part Number	(B46+B48)*X
Shaft Diameter	12 millimeters
Speed	920 rpm
Voltage	12 volts

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